IMIESA July 2018 by 3S Media

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IMESA The official magazine of the Institute of Municipal Engineering of Southern Africa

infrastructure development • Maintenance • service delivery

City of Cape Town

Investing in infrastructure

Dams & Reservoirs Countering the sedimentation threat

Roads & Bridges A new Namib route

SBS Tanks Innovations in water storage

ISSN 0257 1978

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INSIDE

volume 43 no. 07 July 2018

The official magazine of the Institute of Municipal Engineering of Southern Africa

INFRASTRUCTURE DEVELOPMENT • MAINTENANCE • SERVICE DELIVERY

City of Cape Town

Dams & Reservoirs

Investing in infrastructure

Countering the sedimentation threat

Roads & Bridges

A new Namib route

SBS Tanks Innovations in water storage

ISSN 0257 1978

PIPES, PUMPS & VALVES

Heat transfer developments

V o l u m e 4 3 N o . 7 • J u l y 2 0 1 8 • R 5 0 . 0 0 ( i n c l . VAT )

The roll-out of a series of desalination plants has given Cape Town a new lease on life and a chance for the city’s depleted dams to bounce back from the extended drought. P6

From Upington to Durban

Waste Management Waste governance and sustainability 31

Regulars Editor’s comment

President’s comment

Index to advertisers

Cover Story 6

Innovations in water storage

Municipal Focus | Cape Town 8

Investing in infrastructure Effective desalination solutions

Desalination goes solar

Heat transfer developments

From Upington to Durban

Panel Discussion | Water Delivery Rainbow Reservoirs

Hall Longmore

Dura-Line Africa

Dams & Reservoirs

DAMS & RESERVOIRS What does your data look like?

Upgrading the ‘river route’

Surfacing the city

Environmental Engineering Soft ground solutions

Building Systems Sustainable brick expansion

Consulting Engineers Effecting change

Pipes, Pumps & Valves

Roads & Bridges

Cement & Concrete The art of additives

Water for Warden

Stormwater integrity

Transport, Logistics, Vehicles & Equipment Renewed compaction focus

Compacting redefined

What does your data look like?

Together for future success

Countering the sedimentation threat

Yellow metal and public fleets

WASTE MANAGEMENT Waste governance and sustainability

Cement & Concrete The art of additives

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EDITOR’S COMMENT Publisher Elizabeth Shorten MANAGING EDITOR Alastair Currie SENIOR JOURNALIST Danielle Petterson JOURNALIST Liesl Frankson Head OF DESIGN Beren Bauermeister Chief SUB-EDITOR Tristan Snijders SUB-EDITOR Morgan Carter ContributorS Gavin Clunnie, Bryan Perrie, Peter Townshend, Nigel Webb CLIENT SERVICES & PRODUCTION MANAGER Jayshree Maharaj Production COORDINATOR Jacqueline Modise financial Director Andrew Lobban DISTRIBUTION MANAGER Nomsa Masina Distribution coordinator Asha Pursotham SUBSCRIPTIONS subs@3smedia.co.za Printers United Litho Johannesburg +27 (0)11 402 0571 ___________________________________________________

anaging threats and oppor tunities was central to the talks at the 2018 Water Institute of Southern Africa Conference, held in Cape Town in June. The theme was ‘Breaking boundaries, connecting ideas’. Opening speakers at the conference included Helen Zille, premier of the Western Cape, and keynote speaker and renowned scenario specialist Clem Sunter, both of whom set the scene with powerful insights. Cape Town has become a focal point globally due to the extended drought, plus the way the city has successfully managed the crisis. As Zille pointed out, making informed decisions was a critical factor in addressing the problem – a detailed analysis of a similar experience in Australia being a vital part of the assessment process. In Australia’s case, a major investment in a permanent desalination solution proved to be the wrong approach and, when rainfall patterns improved, a number of these expensive plants were mothballed. At the time of the conference, Cape Town’s dam levels were close to 42% – a big improvement on the situation the same time last year. At that stage, the figure was hovering around 23%. However, this positive rainfall trend in 2018 still doesn’t provide any certainty. In response, and to cater for this, there’s a new water economy developing that does, which includes the introduction of domestic and commercial water reuse technologies, and rainwater harvesting practices. However, as Zille pointed out, “Every new solution brings a new challenge.” For example, situations where an increasing number of consumers opt to go off the grid for water and energy requirements help the

Advertising Sales Jenny Miller Tel: +27 (0)11 467 6223 Email: jennymiller@lantic.net ___________________________________________________

150 Rivonia Road, Morningside, 2196 Publisher PO Box 92026, Norwood 2117 Tel: +27 (0)11 233 2600 Fax: +27 (0)11 234 7274/5 www.3smedia.co.za Annual subscription: R600.00 (INCL VAT) ISSN 0257 1978 IMIESA, Inst.MUNIC. ENG. S. AFR. © Copyright 2018. All rights reserved. ___________________________________________________ IMESA CONTACTS HEAD OFFICE: Manager: Ingrid Botton P.O. Box 2190, Westville, 3630 Tel: +27 (0)31 266 3263 Fax: +27 (0)31 266 5094 Email: admin@imesa.org.za Website: www.imesa.org.za BORDER Secretary: Celeste Vosloo Tel: +27 (0)43 705 2433 Fax: +27 (0)43 743 5266 Email: celestev@buffalocity.gov.za EASTERN CAPE Secretary: Susan Canestra Tel: +27 (0)41 585 4142 ext. 7 Fax: +27 (0)41 585 1066 Email: imesaec@imesa.org.za KWAZULU-NATAL Secretary: Ingrid Botton Tel: +27 (0)31 266 3263 Fax:+27 (0)31 266 5094 Email: imesakzn@imesa.org.za NORTHERN PROVINCE Secretary: Rona Fourie Tel: +27 (0)82 742 6364 Fax: +27 (0)86 634 5644 Email: np@imesa.org.za SOUTHERN CAPE KAROO Secretary: Henrietta Olivier Tel: +27 (0)79 390 7536 Fax: +27 (0)86 629 7490 Email: imesasck@imesa.org.za WESTERN CAPE Secretary: Michelle Ackerman Tel: +27 (0)21 444 7114 Email: imesawc@imesa.org.za FREE STATE & NORTHERN CAPE Secretary: Wilma Van Der Walt Tel: +27 (0)83 457 4362 Fax: +27 (0)86 628 0468 Email: imesafsnc@imesa.org.za All material herein IMIESA is copyright protected and may not be reproduced either in whole or in part without the prior written permission of the publisher. The views of the authors do not necessarily reflect those of the Institute of Municipal Engineering of Southern Africa or the publishers.

The future of resourcing planning environment, but put a dent in municipal tariff revenue inflows.

Liquid gold Sunter’s address was riveting and a balanced view in terms of natural and human resource management. At the time when the drought risk was building, he provided invaluable input to the city’s infrastructure team in its quest to map out a way forward. One of his observations is that the tipping point for climate change has passed; from here on, extreme weather patterns are expected to become the norm. Resource planners and users will need to adapt constantly: ‘liquid gold’ (rain) can never be taken for granted. What the Cape Town water crisis has brought about is an evolving and greater cohesion between local and national government, the latter being the custodian of bulk water supply. From his research, Sunter said that the quality of infrastructure is one of the flags, or burning issues, that business leaders identified as either a threat or an opportunity for South Africa’s future outlook. He cites China as an example of a country that invested heavily in infrastructure to exponentially change its micro- and macroeconomic outlook, in the process becoming an increasingly dominant player in global terms. For South Africa, Sunter stresses the need for a united team approach, something well demonstrated during Cape Town’s Day Zero campaign. For Sunter, that means focusing on pockets of excellence and then replicating them. And the pace of positive change will inextricably be linked to a concerted investment in infrastructure.

Alastair Currie To our avid readers, check out what we are talking about on our website, Facebook page or follow us on Twitter and have your say.

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INFRAS TRUCTU

City of Cape Inves ting in

Infrastructure News

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Coun tering ion threa t sedim entat

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Innovations

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Cover opportunity

In each issue, IMIESA offers advertisers the opportunity to get to the front of the line by placing a company, product or service on the front cover of the journal. Buying this position will afford the advertiser the cover story and maximum exposure. For more information on cover bookings, contact Jenny Miller on +27 (0)11 467 6223. IMIESA July 2018

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President’s comment

IMESA

Building a

greener future

ustainability is a broad term and there are a number of definitions out there relating to natural resource and ecosystem preservation. One of the most recognised is the United Nations’, which defines sustainability as “development that meets the needs of the present without compromising the ability of future generations to meet their own needs.” Essentially, there are three pillars to this – namely environmental, economic and social – that all interconnect at some point. As municipal engineers, we have an intimate understanding of how the rate of urbanisation is encroaching on our natural habitats, with the increase in hard surface areas exacerbating water run-off and erosion. For this reason, our current and future infrastructure interventions must take greater cognisance of green interventions, like permeable pavements, rainwater harvesting, and environmentally engineered structures in general. That’s aside from the need for responsible conservation practices. For example, we must make more effort to reuse our wastewater for both potable and industrial streams, while other renewable solutions like solar should become far more commonplace.

Other factors to consider include ensuring the use of sustainable construction materials, which range from cement to the insulation materials installed in homes and buildings.

IMESA president Gavin Clunnie

Viewed from a mountain bike For the IMESA 2018 conference in Por t Elizabeth, we’ve decided to demonstrate our commitment to sustainability by incorporating a ver y novel and fun element: all par ticipants are invited to take par t in our mountain bike tour, which will pass through the city’s Baakens River catchment – a critical ecosystem that needs careful management. The visit to the Baakens Valley is also one of the separate technical tour options available at the conference, where delegates will hike along a 3.5 km trail and view some of the key infrastructure, fauna and flora. Most of the city’s stormwater runs directly into the river, which has been subjected to severe erosion and seasonal flooding, exacerbated by the high percentage of impermeable sur faces in the catchment, as well as pollution. That includes leakage from the city’s major sewerage line, which is outdated and requires urgent maintenance.

There are 17 bridges and causeways, which impact physically on the Baakens River valley by inhibiting flow and removing riparian vegetation on the banks. During high flow, the bridges cause debris to build up, increasing flood risk. Habitat loss is also a critical factor and greater protection and restrictions need to be enforced, while also taking into account the need for urban development. On a less serious note, the IMESA mountain bike event is a must and we encourage you to par ticipate; just remember to bring your bike. The trail traverses scenic and undulating sections of the Baakens Valley over a distance of 20 km and includes a number of stream crossings. Those who feel par ticularly energetic can go for the 40 km twolap option or tackle it with ease on an electrically powered mountain bike. Now that’s sustainable.

IMIESA July 2018

Cover story

Innovations in The roll-out of a series of desalination plants has given Cape Town a new lease on life and a chance for the city’s depleted dams to bounce back from the extended drought.

ape Town has become a hot topic for water engineering over the past 18 months. Scientists at UCT have said that this is the worst drought in Cape Town’s recorded history, and some have even gone so far as to label it a “once in a millennium”

water storage

drought. Those are scary statements to take in. The reality: Cape Town is a case in point for the drastic impact climate change is having, and will continue to have, on the global population. And with our climates changing so significantly, we need the brightest minds in engineering to be focusing their efforts on new technology that will mitigate these serious repercussions. Quite possibly, the key focus area for innovative engineers is the water industry. We all know that water is life, and we’ve probably all heard the statement that “the next world war won’t be around oil, but around water”.

A section of the desalination plant at the V&A Waterfront in Cape Town; the tank systems were supplied by SBS Tanks®

IMIESA July 2018

Whether that’s true or not is beside the point. The point is that climate change is causing dramatic adjustments to our water sources, and we as the global community need to adjust our methods of storing and providing safe drinking water. It has been quite interesting to watch the innovations popping up in the Western Cape from a 5ℓ water-saving pump-shower to a ‘drinkable book’ – a book of sterilisation sheets that sterilise and purify almost all forms of contaminated water. Then of course there is the surge in rainwater harvesting and borehole solutions as people and businesses alike seek to get off the grid and not rely on the dwindling dam supply. It is amazing to see first-hand just how crisis drives innovation, and long may the innovation continue. As this global water crisis develops, municipal engineers and government officials would do

COVER STORY

For the V&A project, SBS Tanks® supplied two ST09/04 tanks that each store 125 kℓ and a ST11/04 unit capable of storing 186 kℓ

Completion of the concrete ring beam foundation in preparation for the next tank

well to take note of these innovations, and see where such water-centric approaches can be applied to their areas of jurisdiction. And do so before the effects of this crisis are felt first-hand within their regions. One of the hot topics amidst the Cape Crisis is that of desalination. It makes obvious sense that when you’re surrounded by gigalitres of ocean water, you should do what you can to turn it into drinking water, especially if there are already thousands of case studies to not only work with, but improve upon as well.

relationship, coupled with the City of Cape Town’s urgent need, led QFS to import an entirely containerised desalination plant directly from Osmoflo’s Dubai office. This plant is made up of seven standard shipping containers, each with an array of reverse osmosis desalination filters and media, all ready to ‘plug and play’. This unique containerised solution allowed the plant to be imported directly from Dubai within only thirty days, meaning the operation could be ready in a matter of weeks. The challenge, of course, was storage of the water itself.

Containerised solution

Tanks on the critical path

A particularly attention-grabbing project was that of a containerised desalination plant on the V&A Waterfront docks. A hat-tip must go to the City of Cape Town who, as a municipality, was frantically exploring droughtmitigation options as the dreaded Day Zero quickly approached. It put the project out to tender, and awarded it to Quality Filtration Systems (QFS), based in Strand, Western Cape. QFS has a working relationship with Osmoflo of Australia, one of the world leaders in desalination and water recycling. This

This is where South Africa’s leading water storage provider was able to put up its hand and respond to the need. The plant is able to produce 2 MLD of potable drinking water, pumped into the municipal water supply for the region. Those two megalitres need to be stored before being directed into the municipal lines and it was here that the choice of SBS Tanks® was a no-brainer. The City of Cape Town would take nothing less than the best in storage and longevity, and bearing in mind that the deadline was a

very tight two-month window, SBS Tanks® was the clear and obvious choice for the job of water storage. The plant needs three phases of water storage: the brine, the second-phase filtered water, and the final-stage potable water. Thus, three tanks were required. SBS Tanks® answered the call and was able to provide two ST09/04 tanks that each store 125 kℓ, and one ST11/04 capable of storing 186 kℓ. These tanks are the perfect sizes for the application, and at 6.1 m (ST09/04s) and 7.5 m (ST11/04) in diameter, they didn’t take up considerable space in the parking lot provided for the project. And with each one standing a proud 4.2 m high, they look ready for serious use, but don’t overwhelm the urban environment of the area. With a total of 436 kℓ in gross water storage, one would imagine that these tanks would have quite a serious transport commitment and construction process. But with their innovative and advanced modular design, the tanks were delivered piece by piece, and installed by a humble team of six, who were able to have the first tank installed and ready for commissioning within a week. With SABS, ISO and OHSAS certification, and a proudly South African manufacturing facility in KwaZulu-Natal, it is a project like this that proves the quality of SBS Tanks®. Able to deliver in remarkable turnaround times, with highest quality workmanship from manufacture to installation, and a builtto-last product that can go the distance, it’s no wonder companies like QFS choose SBS Tanks® for projects such as this at the City of Cape Town’s V&A Waterfront. This desalination plant is one of many innovative solutions that showcase just what can be accomplished when our backs are against the wall to an impending water crisis. Water truly is life, and it is exciting to know that companies like these are hard at work ensuring all South Africans are provided with the highest quality drinking water possible.

+27 (0)86 048 2657 water@sbstanks.co.za

IMIESA July 2018

Municipal Focus | Cape Town

Investing in infrastructure While continuing work on its water security, the City of Cape Town has placed a focus on housing, transpor t and energy in the upcoming financial year.

he City of Cape Town has allocated a R47.7 billion budget for the 2018/19 year, of which R8.4 billion has been set aside for the capital budget. A large portion of this is allocated to infrastructure, including a R4.1 billion capital spend for informal settlements, water and waste services, R1.8 billion for transport and urban development, and R1.1 billion for energy.

Going big on housing Over the next three financial years, the city’s Transport and Urban Development Authority (TDA) will spend the bulk of its capital budget on the provision of new housing opportunities, new roads to relieve traffic congestion, and the roll-out of the MyCiTi service. Given the dire need for housing, R2.1 billion will be spent on the development of new housing opportunities over the next three financial years. For 2018/19, R590 million is budgeted for 36 housing developments, which are either in the planning phase, already under way, or in the process of being finalised. According to Cllr Brett Herron, MMC: Transport and Urban Development, City of Cape Town, the bulk of the housing opportunities will

be developed on well-located land close to public transport, jobs, government services and public amenities. To fund the acquisition of additional well-located land parcels for future housing projects, the TDA has budgeted R155 million for land in the next financial year. Cape Town is also increasing the delivery of affordable housing opportunities by partnering with non-profit social housing institutions, which offer subsidised rental accommodation in good locations to more than 2 000 low-income households in Cape Town.

Expanding transport options The City of Cape Town plans to improve mobility within its bounds, across all transport opportunities. The municipality recently signed an agreement with Prasa and the Western Cape Provincial Government to train and jointly fund a dedicated enforcement unit to focus on the safety and security of Metrorail commuters and infrastructure.

Sidewalks and cycle lane infrastructure will also be expanded through non-motorised transport funding received from national government. New minibus-taxi facilities will be constructed in Dunoon and Masiphumelele, while other existing facilities will be refurbished with covered walkways and restrooms. To relieve traffic congestion, the TDA has allocated R481 million over the next three financial years for the construction of new road infrastructure in congestion hotspots around Cape Town. Several projects are already under way, including the dualling of Kommetjie Road in the far south, Belhar Main Road and Erica Drive in Belhar, and Langverwacht Road in Kuils River. R816 million is budgeted for the rollout of Phase 2A of the MyCiTi service between Mitchells Plain, Khayelitsha, Claremont and Wynberg. This will be spent over the next three financial years on the upgrade of Stock Road in Philippi, Jan Smuts Drive (M17) in Plumstead, and on the construction of new bus depots. Once

Municipal Focus | Cape Town

Desalination plants

Residents are already drinking treated sea water. The desalination plant at Strandfontein, now operational‚ is currently pumping 4.7 MLD into the reticulation system,

fully rolled out and implemented, Phase 2A will serve more than 1.4 million commuters from the metro south-east.

A new water plan The city’s New Water Plan is under way to supplement water resources in the waterscarce city. The budget for the coming 2018/19 financial year has been reduced from R2.4 billion to R1.5 billion, with Cape Town having amended the capital requirement for the plan. The amended New Water Plan is now proposed to require R14.1 billion over the next five years instead of the originally proposed R19 billion. The city reports that getting through to the rainy season requires managing the remaining water in dams, managing demand as much as possible, and bringing on-stream water from other sources (ground, reuse and desalination). According to the Water Outlook 2018 Report (Revision 25, updated 20 May, 2018), the modelling and analysis of scenarios shows that, using a stochastically generated set of rainfall patterns, and assuming a 1 in

with the plant expected to reach full production of 7 MLD later this year. The V&A Waterfront desalination plant, which has been ready for production since April 2018, can produce 2 MLD

200 level of assurance, an augmentation of 50 MLD to 100 MLD would currently be sufficient. As the municipality does not have current augmentation of this scale in place, it is working on the medium term, requiring augmentation of 300 MLD to 350 MLD to keep dam levels above restriction levels by the end of summer, providing a margin of safety. Fur ther modelling, using rainfall predictions from global climate models, is currently being undertaken to inform the city’s decision-making, taking into account the combination of climate change impacts with natural variability. In the interim, Cape Town’s augmentation plans are based on a long-term augmentation of 350 MLD. The report states that this is a risk-averse view that will give the city a very high level of assurance of supply and will prevent the kind of restrictions currently being experienced from being implemented again in the foreseeable future.

Exploring natural gas In June, the City of Cape Town signed a US$963 684 (±R12.7 million) grant agreement with the US Trade and Development Agency for

of treated water for the City of Cape Town. The Monwabisi plant is progressing well, with full production of 7 MLD to be reached by July, if all goes according to plan.

a feasibility study to assess the viability of a natural gas distribution network and usage options for the city. Executive Mayor Patricia de Lille believes this will strengthen the municipality’s efforts to reach its goal of providing a greater mix of energy sources to offset the use of fossil fuels in producing electricity. The study, estimated to be completed in early 2019, will assess the technical, economic and financial viability of a natural gas distribution network, along with usage options for gas such as the repowering of existing power plants in Cape Town. “It is our intention to play a greater role in fostering a dynamic energy market and this study will help us understand the role that gas can play in supporting such a market,” said De Lille. “I am very excited about this work, as the city is looking to pioneer a new approach with regard to energy and the role of cities, particularly in South Africa.”

DID YOU KNOW? Some of Cape Town’s most significant projects on the 2018/19 budget: • R253 million for dark fibre broadband infrastructure • R95 million for electrification • R53 million for street lighting • R114 million for the Bellville Wastewater Treatment Works • R75 million for the Cape Flats Wastewater Treatment Works • R109 million for the upgrading of solid waste facilities • R9 million for CCTV installations • R21 million for cemetery developments • R9 million for the construction of the Dunoon Library • R10 million for the Manenberg Integrated Project • R14 million for the new Fisantekraal Clinic • R20 million for the new Pelican Park Clinic • R240 million for congestion relief projects • R287 for integrated rapid transit projects • R155 million for land acquisition

IMIESA July 2018

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Municipal Focus | Cape Town

Effective desalination solutions Cape Town’s first temporary desalination plants at the V&A Waterfront and Strandfontein are now online, with the third emergency RO plant at Monwabisi to follow soon.

ith increasing pressure being placed on water resources, not only in Cape Town, but country-wide, Henk Smit, managing director, Vovani Water Products, believes all possible options must be explored to ensure water supply – including desalination. Vovani has been involved in all three of Cape Town’s emergency desalination plants, supplying flexible pipe couplings, high-pressure pumps, energy-recovery devices, FRP pressure vessels, and RO membranes to the plants at the V&A Waterfront, Strandfontein and Monwabisi.

Cost-saving technologies Vovani supplies Fedco high-pressure pumps for desalination projects as well as various Fedco energy-recovery devices. These devices can be used in areas where water flow and pressure can be utilised for saving on power consumption, or to generate electricity. By using these high-pressure boosters, along with low-pressure hydraulic energy management integration Henk Smit, managing director, Vovani Water Products

and low-pressure drive conversion of brine hydraulic energy into electricity systems, the energy demands can be reduced, explains Smit. “The capital costs of these desalination plants have reduced over time and Vovani, together with its suppliers, strives to supply the highest-quality products at lower capital costs in order to make these desalination plants more cost-effective, and the preferred solution,” says Smit. “The RO membranes we represent, sourced from LG Chem, are incorporated with innovative thin-film nanocomposite technology and reduce the cost of desalination while delivering superior water quality.” The RO membranes provide salt rejection of 99.85% and the highest boron rejection of up to 93% in the market, and produce 20% more flow than membranes manufactured with conventional technologies. Vovani also supplies UF membranes that remove all suspended solids from feedwater and serve as prefiltration to the RO membranes, to protect and increase membrane lifespan. These UF membranes, supplied by SUEZ Water Technologies and Solutions, are also used for surface water, wastewater and water reuse filtration. The company also represents Muhr, which manufactures screening

systems used for desalination and wastewater treatment plants. These systems are imperative to remove seagrass, seaweed, shells and other large solids from the desalination plant’s feed stream, which can damage any of the upstream filtration processes.

Cape Town’s solutions The V&A Waterfront desalination plant, which has been ready for production since April 2018, can produce 2 MLD of treated water for the City of Cape Town. Vovani has installed 168 low-energy RO membrane elements from LG Chem at this desalination plant. The desalination plant at Strandfontein, now operational, is currently able to supply the full 7 MLD into the reticulation system achieving its full production. The Monwabisi plant is progressing well, with full production of 7 MLD to be reached by July, if all goes according to plan. Vovani and LG Chem supplied 1260 RO membrane elements for these two desalination plants. “Desalination is a very viable option for cities and areas along or near the coastline. Seawater, as a water source, is easily accessible and we have the latest technology available to treat it to potable drinking water quality. Being surrounded by oceans on the eastern, southern and western parts of the country, we must explore it further in South Africa,” says Smit

IMIESA July 2018

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Municipal Focus | Cape Town

Desalination goes solar

South Africa is set to get its first solar-powered desalination plant at Witsand, Hessequa Municipality, in the Western Cape, later this year.

rofessor Erwin Schwella, professor of Public Leadership at Stellenbosch and Tilburg universities, initiated the solar-powered desalination project together with the hosting municipality. The project is co-funded by the Western Cape Provincial Government through the drought relief fund, and by the French Treasury through a fund dedicated to the implementation of innovative green technologies. The site selected for the first solar-powered desalination unit forms part of Witsand Village, which has been suffering from critical water shortages. The plant, powered only by solar energy, will produce 100 kℓ of fresh water per day to address the normal local water requirements. The plant also offers the ability to supply drinking water outside of sunlight hours and is connected to the local electricity grid.

This will assist in addressing the December holiday peak period, allowing daily production capacity to increase to 300 kℓ. “The shortage of water in the Western Cape is a harsh reality, and only by implementing preventative measures will Hessequa Municipality be able to create water resource stability in our region. The municipality is utilising innovative ideas in combating the effects of climate change, by taking the frontrunner approach in establishing public-private intergovernmental relationships and joint ventures. These partnerships will ensure a green economy that aims to reduce environmental risks and ecological scarcities,” says Grant Riddles, executive mayor, Hessequa Municipality.

Intelligent technology Osmosun® is a technology developed by French company Mascara Renewable Water

and brought to South Africa by local partner TWS-Turnkey Water Solutions. It is the world’s first reverse osmosis desalination technology coupled with photovoltaic solar energy without batteries, designed to supply coastal or borehole-dependent communities with drinking water at a competitive price and without CO2 emissions. An intelligent system of membranes enables the plant to cope with variations in solar power availability. All parameters are instantly optimised to ensure the best energy per formance and simultaneously guarantee the maximum lifetime of both installation and membranes. “The sun has been desalinating oceans for millennia. Mascara is delighted to provide its nature-inspired resilient solution to do its share to sustainably alleviate the water crisis of the region,” says Marc Vergnet, CEO, Mascara Renewable Water.

IMIESA July 2018

82ND IMESA CONFERENCE

31st October to 2nd November 2018 B OA R D WA L K H OT E L

PORT ELIZABETH

2018

INNOVATIVE INFRASTRUCTURE SOLUTIONS

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Pipes, Pumps & Valves

Heat transfer developments The University of Pretoria’s new controlled-temperature test unit will play a vital role in ongoing research into heat transfer, fluid mechanics and thermodynamics.

rofessor Josua Meyer, chairman of the School of Engineering and head of Mechanical and Aeronautical Engineering, University of Pretoria (UP), says the multimillion-rand project was partly funded by the university, along with donations from industrial companies that include KSB Pumps and Valves. Dylan Mitchell, external sales representative, KSB, says the company was initially approached by Ascend Consulting Engineers to obtain data on the pumps. KSB later revealed that a project was being undertaken for UP and that sponsorships were being sought. “In this regard, we’re always ready to assist educational institutions and gave the thumbs-up to the project. Wherever technical assistance was required, we were happy to weigh in with our expertise, but must commend the university, consulting engineers and the contractors who worked tirelessly to deliver a world-class installation,” says Mitchell.

Flow loops The system relies on temperature monitoring of flow loops. The user demand within each loop is controlled using a system of pumps, variable-speed drives, pressure transducers and special valves. This allows up to eight experiments to plug in simultaneously without affecting either the flow rate, working pressure or temperature of the unit. Five Etanorm 50/32/250 pumpsets were supplied by KSB with motor outputs of 3 kW, 2.2 kW and 1.5 kW to meet the main pumping requirements of the complex system.

Programmable logic control ensures that all parameters are checked and balanced to ensure the system delivers fluid at the right temperature points and flow conditions, 24 hours a day, regardless of the number of students using the facility. It also ensures that ongoing and larger-scale research projects can be undertaken, including some cutting-edge research that is already being done in collaboration with other international universities. This includes valuable research concerning concentrated solar power, nuclear safety, as well as micro and power-related electronics, heat exchange tubes and clean energy studies. “We’re thankful for the ongoing support of companies to the cause of our students and the university. Considering heat transfer is a fundamental subject for all undergraduate engineering studies and that the University of Pretoria produces between a quarter and a third of the countr y’s engineers, we believe that this kind of support is essential and can be viewed as a strategic investment in engineering for all of South Africa to reap the rewards,” Meyer concludes.

Dylan Mitchell (left), sales representative, KSB, and Professor Josua Meyer, chairman of the School of Engineering and head of Mechanical and Aeronautical Engineering at the University of Pretoria

Etanorm pumps form the backbone of the system

IMIESA July 2018

Pipes, Pumps & Valves

From Upington to Durban Water and wastewater upgrades across the countr y are delivering on essential ser vices.

D A total of 2.12 km of ductile iron pipe was supplied to the Moorreesburg District Council

Incledon supplied 6 km of SRP pipe for the Tekwane South integrated human settlement project in Nelspruit

PI Trading, a division of the larger national Incledon Group, has recently been involved in a range of major infrastructure projects. These include supplying pipe and fittings to Ruwacon Civils, the main contractor on the Nduli Reservoir project in Ceres for the Witzenberg Municipality. This 4.5 Mℓ, reservoir will supply water to the existing Nduli community, as well as cater for future low-cost housing developments. The project commenced in March 2017 and was completed at the end of January 2018. DPI Trading also supplied 2.12 km of ductile iron pipe to contractor Afriline Civils for a R1 million water pipeline project on the West Coast for the Moorreesburg District Council. The main aim of this fast-track project was to replace 2 120 m of old asbestos in the F4 water pipeline with 250 mm DI Class C40 pipe, including scour and air valves as required. Incledon Nelspruit supplied 6 km of PE100 800 mm steel-reinforced spirally wound HDPE pipe for the Tekwane South integrated human settlement project, which consists of 722 Breaking New Ground (BNG) houses and walk-up units for 500 households. The sewer pipe forms part of the bulk infrastructure, running from Tekwane South Extension 2 to the wastewater treatment works. The pipe was made from reinforced polyethylene, formed by integrating HDPE with steel strips.

Free State & KZN

DPI Trading supplied pipe and fittings to Ruwacon Civils for the Nduli reservoir project in Ceres

IMIESA July 2018

With increasing market demands for a “basket” of quality fluid conveyance products, Incledon Bloemfontein saw the need to reopen its doors in November 2017 and was officially relaunched in January 2018. It will service the civil, irrigation, mining and industrial markets in the key Free State area. In late 2017, Incledon KwaZulu-Natal relocated to new premises in Prospecton, Durban, with the added benefit of quicker service delivery and improved stock-control processes. As an integral coastal branch, Incledon KZN forms

part of the group’s national footprint. Its staff have a combined 35 years’ expertise in civils, end-user engineering, and the wholesale market. The Incledon Group currently stocks over 15 000 preferred products. These include highly-recognised brands of pipes, fittings, flanges, valves, pipe couplings, pipe working tools and threading machines, HDPE, mechanical compression fittings and electrofusion systems, surface, dewatering and borehole pumps, water meters, and plumbing and related products. Sectors covered include the engineering, industrial, mining, agricultural, OEM, municipal, civil infrastructure, plumbing merchant and irrigation markets. “Incledon distributes products utilised in the conveyance of water, gases and liquids. We have the largest and widest consolidated quality product offering in order to service the industries we operate in, and are well-positioned to take advantage of the government’s infrastructure development programmes,” explains Kelly Wilson, CMO, Incledon.

National coverage Today, Incledon has branches in every major South African city, with a formidable national footprint including Bloemfontein, Upington, Cape Town, Durban, East London, George, Johannesburg, Mbombela, Polokwane, Port Elizabeth, Secunda and Rustenburg, in order to ensure that customer service remains the top priority. “What makes Incledon different in a highly competitive market is the fact that we represent the top brands in our industry, and that we are truly focused on providing our customers with dependable and reliable service levels to build and nurture these relationships,” Wilson highlights. Incledon also supplies industr yrelated products such as manhole covers and frames, in addition to ancillary pipe equipment such as pipe cutting, threading tools and wrenches. “While our core product range and competency is pipe, fittings, jointing and valves, we have the necessary flexibility to be able to meet a range of requirements and specifications,” Wilson concludes.

Panel Discussion | Water Delivery

Rainbow Reservoirs Quinton Coetzee | Marketing Manager

Tanks for Africa Water storage is a critical requirement for all industries, and is a major consideration for municipalities in terms of their potable and wastewater delivery mechanisms. IMIESA speaks to Quinton Coetzee, marketing manager for Rainbow Reservoirs, about the range of solutions offered by this South African pioneer.

When did Rainbow Reservoirs commence operations?

requirements, including those of the South African mining sector.

QC Rainbow Reservoirs was established in 2003 and has since undergone major growth. From inception, we’ve based our designs on the strictest standards, including those of the Australian water industry, widely regarded as being a leader in the regulation of steel tank reservoirs for potable use. Our research and development programmes have also benefited from our alliance with Australian company Heritage Tanks, a respected name in the field of modular steel reservoir design and fabrication. In terms of manufacturing, our primary production facility is based in Benoni, Gauteng. Our tanks are engineer-designed and structurally certified to meet industry health and safety

What makes the company unique?

IMIESA July 2018

I would say it’s definitely our design innovation, and that comes down to the investment we make in the training and development of our people. Plus, we’re constantly investigating new markets.

Is the export market a focus area? Yes, and the company is export registered. Outside South Africa, the African continent is our biggest market, with installations in 14 African countries. For example, we recently supplied tanks for a harbour installation in Ghana. We continue to expand globally as well and have completed orders for countries that

include Indonesia, Panama and the Philippines. We have qualified field supervisors and personnel who can assist with installations and provide on-site technical backup in any corner of the world.

Which sectors do you cover? In addition to the commercial and industrial sector, we cover the municipal markets, mining, agriculture, the food and beverage sector, and the oil and gas industry. Tourism is another area with great prospects and we’ve supplied installations for some of South Africa’s leading hotels and resorts.

Tell us about the work you do in the fire sector? This is an important component of our business. We’re members

of the Automatic Sprinkler Inspection Bureau and the Fire Protection Association of Southern Africa. We design and manufacture dedicated firefighting and fire hydrant tanks, which connect directly to automated sprinkler systems. We equip these tanks with vortex inhibitors that counter the effect of water leaving the tank at high pressure during a fire emergency. We also design dual-purpose firefighting and potable tanks. To date, applications include hospitals, shopping malls, commercial buildings, industrial complexes, and fuel refineries.

What’s the product range? Tanks can be assembled in heights from 1.2 m to 6.9 m and capacities from 5 000 ℓ to

Panel Discussion | Water Delivery

4 Mℓ as stand-alone units or part of a tank farm. They can also be supplied in a range of colours. We can vary the height and width of the tank to match the site footprint. Some clients prefer a flatter, more low-profile design. All tanks are lined with a UV–resistant, multilayered certified liner to match the nature of the liquid being stored. A domed roof completes the structure.

How do steel tanks compare with

Biogas plant

conventional concrete reservoirs? These are modular, bolted-panel steel tanks, designed for rapid installation. For example, the average installation time for a 400 000 ℓ tank is two days and around three for a 500 000 ℓ unit. That compares with conventional concrete reservoirs, which can take months to construct. Another advantage is that our tanks are designed to be ‘flat packed’ for ease of shipping and transport. That’s also a key

A biogas tank system designed and installed by Rainbow Reservoirs

STORAGE TANK FOR Agriculture

A range of tank colour options are available

firefighting systems

advantage when installing reservoirs in remote areas. Additionally, tanks storing 350 000 ℓ or less don’t require a concrete ring-beam foundation. They simply rest on a wellprepared sand base. From a construction perspective, that’s an attractive proposition for higher-volume users: they can opt for a series of tanks under 350 000 ℓ rather than incurring the extra civils cost of preparing a ring-beam foundation for a larger, stand-alone unit.

Are bespoke designs offered? Purpose-designed tanks for the desalination, biogas and solar PV markets are just a few examples of some of our custom jobs. We like to think outside the box. When it comes to desalination, it’s a given that these tanks need to be constructed to a very high standard. In this respect, all our tank walls and roofs are manufactured with Zincalume-coated sectional steel sheeting. Zincalume is known for its outstanding anti-corrosion properties, making it ideal for coastal desalination plants and applications like acidic wastewater. Within the renewable energy segment, Rainbow Reservoirs is proud to have supplied tank systems for one of South Africa’s major solar PV installations in the Northern Cape, near Upington. The biogas sector is an exciting new frontier with major potential.

A recent project example is an installation in Tarlton, South Africa. This tank has a 4 Mℓ capacity and an energy output of 600 kW. The requirements for biogass installations are unique. The internal temperature must be carefully regulated to promote the growth of the microorganisms that produce the methane required to generate downstream energy. In partnership with Botala Energy Solutions, we provide turnkey biogas plants of any size, as well as operations and maintenance support.

Is rainwater harvesting a growth market? Definitely. This is becoming a very important issue and we’re receiving a growing number of enquiries. Rainwater tanks will become the norm rather than the exception.

What does the future hold? The recent spate of droughts experienced in South Africa has placed renewed emphasis on water conservation. We also appreciate that there’s an urgent need to address current and future water demand, particularly within the municipal space. We believe we have the solution.

+27 (0)11 965 6016 +27 (0)83 226 8572 www.rainbowtanks.co.za

Key facts • Standard range: 5 000 ℓ to 4 Mℓ • Rapid, on-site installation anywhere • Tanks under 350 000 ℓ don’t require a concrete ring-beam foundation • Engineer-designed and structurally certified • Free-span, Zincalume steel, dome roofs prevent ingress of dust, insects and light • Various colour options • Modular/flat-pack design facilitates ease of transportation and shipping • Tanks can be disassembled and relocated • Cost-effective • Proven to withstand the harshest environments • Low to no maintenance • 12-year warranty, 40-year life expectancy

IMIESA July 2018

Established in 1924

Steel Pipe for Water, Petrochemicals, Gas, Construction and Mining Hall Longmore ranks amongst the most reputable pipe manufacturers in the world. The companyâ&#x20AC;&#x2122;s world-class manufacturing facilities produce large-bore welded steel pipes for a variety of applications.

Electric Resistance Welded Steel Pipe Oil Country Tubular Goods Helical Submerged Arc Welded Pipe International Quality Standards International SpeciďŹ cation Coatings and Linings

+27 11 874 7300

info@hall-longmore.co.za www.hall-longmore.co.za

Panel Discussion | water delivery

Hall Longmore Kenny van Rooyen | Managing Director

You recently attended a major pipe expo. What were your impressions? KvR Hall Longmore showcased its products alongside the best in the world at the Wire 2018 and Tube 2018 expos held concurrently in Düsseldorf during April. There were 2 600 international exhibitors and the show attracted almost 72 000 trade visitors from over 104 countries. That really underscores the role that steel pipe plays in the oil, gas and water sectors, now and in the future. Our attendance was facilitated by the Steel Tube Export Association of South Africa (Steasa) in collaboration with the Department of Trade and Industry (DTI), which financially assists companies wishing to participate in overseas expos under the Export Marketing Incentive Assistance scheme. Housed within the South African pavilion, other exhibitors included the DTI, Steasa, Robor, Delberg Engineering, Honingcraft, and Sea Scape Steel Services. The expo provided a perfect platform to promote Hall Longmore products to a broad export market and to engage with our international customers. We picked up a number of good enquires.

Please expand on product developments. Examples of R&D breakthroughs include our patented protective

coatings and linings for steel pipe. Then, when it comes to jointing systems, our rubber ring joint system (Sintajoint®) is a remarkable innovation. It provides a working pressure rating of 42 bar – adequate for most water pipeline systems. In addition to this, we’ve made provision for a 1.5 built-in safety factor that provides a test pressure rating of about 63 bar; however, in-house test pressures in excess of 70 bar have been recorded.

specifications and site conditions. Fusion-bonded medium-density polyethylene (Sintakote®) is a popular choice among specifiers for water pipe lines, while three-layer polyethylene coatings feature in petrochemical and gas projects. We’ve continued to diversify and recently commissioned our small tube mill, catering for pipes from 16 mm nominal bore up to 250 mm OD.

What about the solar market?

Sintajoint consists of a specially formed spigot and socket, which, when pulled together, compress a natural rubber O-ring between them, providing a highly effective seal. Both systems ensure a trouble-free life: water losses and repair costs caused by leaking joints are eliminated. Accredited by the American Petroleum Institute, the company also manufactures line pipe to API specification 5L (PSL1 & PSL 2) and 5CT. We’ve developed a range of specialised protective coatings and linings to suit specific

This is a growth area. A purpose-built and fully equipped facility at Hall Longmore is now capable of manufacturing solar torque tubes to the most exacting specifications. Recent projects in the Northern Cape include: • the Ilanga – 1 CSP plant in Upington (5 320 units: OD: 610 mm x 4 mm) • the Kathu – 1 CSP plant (1 000 units: OD: 750 mm x 3.2 mm).

Are imports on the rise? Government has addressed the importation of steel products with a localisation and designation strategy, which provides a measure of protection. Steel for public projects must be sourced and manufactured locallyl; however, this ruling doesn’t apply for private sector projects, where some clients may take advantage of cheaper steel imports. As a manufacturer, we have 15% tariff protection in terms of the World Trade Organization (WTO). It’s not enough, but it helps. Generally though, import stats indicate a fairly flat trend at present, especially in terms of big bore carbon steel piping.

What are your thoughts on the US trade embargo? We did everything we could as a company and industry, in conjunction with bodies like South Africa Inc. and the DTI, but the USA Sec 232 steel import embargo is still being applied. This is despite the fact that South African steel imports into the USA represent less than 3% of total volumes, a threshold defined by the WTO as ‘non-threatening’. The USA’s agreement with South Africa in terms of the African Growth and Opportunities Act has just been renewed to 2025. This agreement states that South African importers have access to the USA market duty-free; however, the ban on South African steel imports will remain for the foreseeable future.

Do you have a strong order book? Yes, we’re supplying orders for a range of private and public sector clients. The water sector is relatively buoyant. Public sector projects are dependent on budget. Mining is also picking up. A bigger portion of our order book is driven by stronger export demand, and a weaker currency in support.

What is the future for steel pipe? Future prospects are excellent. South Africa is an acknowledged leader in the design, installation and operation of bulk water steel pipelines. It also has the advantage of a globally competitive steel pipe manufacturing sector comprising Hall Longmore and other reputable manufacturers, supported by a specialist network of pipeline systems engineers and contractors. Steel pipes are a very durable solution.

IMIESA July 2018

Trenchless installation

Compact Pipe

速

Compact Pipe速 is a rehabilitation system for gravity and pressure pipelines. Compact Pipe速 pipes are pre-formed in the factory into a C-shaped cross-section. The pipe is supplied on drums and pulled into existing steel, cast, asbestcement or concrete pipes. The application of steam reshapes the Compact Pipe速 until it is close-fit positioned in the outer casing. It remains a new, robust PE 100 (-RC) pipe installed in the old pipe.

Benefits over normal HDPE trenchless relining are : Available in sizes OD 100 mm to OD 500mm Installed in continuous lengths from 600 m (DN100) to 90 m (DN500) Certified for potable water, gas and sewer applications Supported by Wavin global technical expertise and experience Superior flow rates due to large cross sectional area

www.duralinesa.co.za Nextube (Pty) Ltd Physical: Postal: T: +27 11-708-1659 PO Box 334, Kya Sand 2163 No. 9 Ampere Close, Kya Sand 2163, info_sa@duraline.com Gauteng, South Africa Gauteng, South Africa

Panel Discussion | water delivery

Rehabilitation: close-fit relining of an old pipe Project team Client: City of Cape Town Consulting engineer: Aurecon Contractor: Martin & East Pipe supplier: Dura-Line Africa/ Wavin Germany

IMIESA speaks to the City of Cape Town’s (CoCT’s) Engineering Reticulation unit and members of the construction team about a compact pipe application adopted for the Kildare Road project, which showcases an innovative trenchless technology approach. What’s the project scope? CoCT The project scope was twofold, namely: to complete the rehabilitation of an existing 325 mm nominal diameter (ND) steel water main pipeline, as well as to complete a pilot study on the first implementation of the close-fit lining technique for water mains within the city. The pipeline serves as a connecting water main between the Newlands and Wynberg reservoirs and is part of a longer pipeline span. The section of pipeline that was identified for rehabilitation is only the last segment of 1 225 m, which runs from Kildare Road Pump Station through Colinton Road and stops on the corner of Alice and Eden

roads in Claremont. The pipeline is 79 years old and, as a result of the lack of cathodic protection around it, the steel has become pitted and has resulted in the pipeline becoming non-functional.

How does this tie in with the city’s overall infrastructure programme? CoCT Asset monitoring of reticulation water mains is of vital importance. The pipeline consists of various materials, conditions, diameters, lengths, ages and other factors. The CoCT Engineering Reticulation team is required to continuously understand the various factors and how they affect the lifespan of water main pipelines.

It’s also of vital importance that the CoCT is continuously aware of global trends and methodologies pertaining to water reticulation infrastructure in order to adapt and evaluate these techniques. By taking the pilot study approach, the CoCT is now able to gain knowledge and experience in the implementation of the close-fit lining technique on water mains (which was previously used in eThekwini Municipality and other places in South Africa). As a result, the CoCT reticulation team is able to apply this knowledge in order to draw more effective conclusions on water mains rehabilitation programmes. For example, comparisons of current rehabilitation techniques such as open-cut, pipe-cracking and lining can be made from an economical and functional point of view.

What are the key design considerations? Aurecon The section of pipe being rehabilitated has not been active for a number of years. A number of other active water pipelines run parallel with this one. However, although pinholes have occurred on the ‘dead’ pipe in question due to corrosion, the

pipe still has excellent structural integrity. So, it makes economic sense to run the pilot project and test the benefits of this technology for potential further roll-out to other steel mains installations that need refurbishing. Lining is the only option: you obviously lose some cross-section diameter, but not much and the trade-off is well worth it.

Was going the trenchless technology route the best approach? Martin & East Definitely. The pipe is just inside the kerb line in Kildare Road as well as Collington Street. Open trench replacement would have been a major disruption to the traffic flow in the area. There are various hotels, schools as well as a hospital on these streets. Going trenchless requires only single pit excavations in the position of current fittings like valves, hydrants or tees. The impact on the traffic flow is, therefore, a lot less. The second major benefit is that there are massive savings due to less excavation and, therefore, also less reinstatement. This project will be used to calculate a cost

IMIESA July 2018

Panel Discussion | water delivery

comparison between open trench and the fold and form option, but trenchless methods like pipe bursting are between 1.5 and 2 times cheaper than replacing the pipe by means of open trench on similar projects. The services manager can therefore replace more pipe with the same budget. The trenchless option is also a lot faster than the open trench approach, which also contributes to additional cost savings.

Please expand on the technical challenges faced. Martin & East The original tender was for the lining of the existing pipe with an internal diameter of 300 mm. Upon investigation, it was found that the internal diameter of the existing pipe is 325 mm. The supplier was, however, able to manufacture a pipe to suit the

existing pipe diameter. The only difficulty was that the unfolded pipe will not fit to standard HDPE (high-density polyethylene) fittings in South Africa. We overcame this problem by manufacturing smallerdiameter steel sections to allow the pipe in positions of new fittings to only expand to 315 mm diameter, thereby enabling us to use standard 315 mm diameter HDPE fittings. There are also various electrofusion fittings available that can be used for future tie-ins to the newly installed fold and form pipe should they be required.

Why was the Wavin solution selected? Dura-Line Africa The Wavin compact pipe solution was selected over normal HDPE trenchless installations due to the following: • old pipeline is retained as casing, with no need for pipe cracking

• superior flow rates due to large cross sectional area • available in sizes DN 100 mm to DN 500 mm • installed in continuous lengths from 600 m (DN 100 mm) to 90 m (DN 500 mm) • suitable for potable water, gas and sewer applications • proven track record of effective installations • supported by Wavin global technical expertise and experience.

What is the expected service life? Dura-Line Africa In non-pressure and less acidic applications, the life of the pipe will be greatly extended compared to pressurised applications. Wavin pipes are expected to last about 80 years, taking into account some expected harsh conditions that they may be subjected to during their life time.

What about future pipe trends? Dura-Line Africa The demand for more longevity and durability has resulted in an increasing shift towards the use of polyethylene (PE) pipes for water, sewer and gas applications. It is estimated that 40% of water treated is lost due to pipe leaks and old infrastructure in need of replacement. With the increasing emphasis on environmental conservation, municipalities are opting for trenchless technologies as a way of rehabilitating old pipes. Their second consideration is safety, which cannot be achieved through pipe cracking. The last consideration is the retention of standard water flow rates of which slip liners are not 100% adequate. For these reasons, and backed by sufficient budget allocations, the demand for PE compact pipe will grow significantly.

IMIESA July 2018

APE Pumps - Pumps at the heart of Africa Mining Institutions

Water Processing Utilities

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Power Generation Authorities

Petrochemical Industries

Vertical sump pumps API 610 pumps

26 Nagington Road, Wadeville Germiston 1400, South Africa Tel +27 11 824 4810 | Fax +27 11 824 2770 PO Box 14733, Wadeville 1422, South Africa Email: apepumps@mweb.co.za Website: www.apepumps.co.za

Leaders in pump innovation

Dams & Reservoirs

What does your data look like? The optimal use of available data has always been an essential component of engineering, with modern advancements in software making this a far more precise process. By Alastair Currie

anaging and interpreting geotechnical data is a critical component on all projects to best conceptualise the design approach and deliver in terms of allocated time and costs. Historical data on older projects, though, is often only available in hard copy format and new technologies are needed to make sense of the subsurface geotechnical environment. “As modern-day geotechnical engineers working in the digital age, that no longer presents a problem though,” explains Bruce Engelsman, partner and principal engineer at SRK Consulting’s Cape Town office. “That’s thanks to the development of innovative geological modelling software, which enables us to view historical data in 3D and then critically interpret this information. Without this capability of viewing data in 3D, much less value can be extracted.

“The historical data isn’t always complete, but the software is able to very quickly render complex 3D geotechnical models and this definitely helps to fill in the gaps. The modelling engine is derived from radial basis functions (RBFs) commonly used in reconstructive surgery, which is ideally suited to non-uniform data. The real value of using RBFs in a geological setting is the speed at which large data can be processed.” From inception, SRK has been a leading pioneer and early adopter of advanced geological and mine modelling systems, often working with leading development companies to commercially trial and provide technical feedback. A prime example is the collaboration between SRK’s Perth office in Western Australia and New Zealand company ARANZ Geo (now Seequent) in the development of a mining geology program within the latter’s Leapfrog software suite. SRK makes extensive

Dam site with borehole lithology and geophysical traverse displayed

IMIESA July 2018

Bruce Engelsman, partner and principal engineer, SRK Consulting

use of various Leapfrog packages in its design offices.

Dam investigation On a recent dam upgrade study, SRK was able to use this proprietary software to unpack a host of issues, stability being a key one. SRK was asked to review an existing design supplied by the client, which had been comprehensively prepared with the historical information available. However, when SRK’s geotechnical engineers started analysing the information in a 3D format, a distinctive and previously overlooked pattern emerged: the unfavourable orientation of faults and shear zones was identified, which highlighted potential safety risks during construction. Essentially, the study showed that there was a higher risk than originally anticipated. Without the full 3D picture, this could have led

Dams & Reservoirs

to a more intensive and expensive engineering requirement. “Once you have a 3D model that you’re comfortable with – that you think is telling the story of what’s under the ground – that information can be exported very efficiently to a wide range of other software packages,” Engelsman explains. “Examples include stability analysis software in 2D or 3D; and groundwater modelling software. “As geotechnical engineers, we can now visualise and interpret at levels that provide advanced confidence in the final design recommendation, and at a far quicker pace. That has major benefits when it comes to

factors such as the planning and realistic cost implications of raising a dam wall, or modifying or investigating any other foundation or excavation needs.”

ABOVE LEFT Unfavourable orientation of weaker geological strata exposed

Quarry material validation

was then imported into the model to confirm material quality, as well as its distribution and hence a reasonable quarry production plan could be derived. “Any numerical data can be rendered in these 3D models. For example, we’ve used this approach successfully in analysing a contaminated site. As long as it’s a number, say the concentration of arsenic in soils, it can modelled,” Engelsman concludes.

SRK recently applied this 3D modelling approach in devising a quarry plan for a potential new harbour development. The material will be used to build the breakwater, so there were major cost factors that had to be verified. Some information existed in various formats. SRK then modelled it and supplemented missing areas with a limited amount of exploratory drilling. Laboratory test result data

ABOVE RIGHT Modelled weak zones using geological strength index

11th ICARD | IMWA 2018 Conference International Conference on Acid Rock Drainage International Mine Water Association WISA Mine Water Division 10 – 14 September 2018 CSIR International Convention Centre Pretoria, South Africa

o t K Y S I T I R N U T R O P OP Tshwane University of Technology We empower people

A Green Conference www.ICARD2018.org www.IMWA2018.info

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Dams & Reservoirs

Countering the sedimentation threat Left unchecked, sedimentation build-up is the silent thief of our water resources, but there are effective measures to combat this. By Peter Townshend*

ediment accumulation is the scourge of South African rivers and dams. It never ceases and is continuously filling our dams and water ways, thereby reducing available storage capacity needed to meet our everincreasing demand for water. The recent droughts have denuded the vegetation and the subsequent floods wash down thousands of tonnes of sediment. It is estimated that in the order of 150 million cubic metres of sediment accumulates in our many dams ever y year. This is equivalent to losing one large dam to sediment annually. Many dams and weirs have already lost their function due to silting up. This is a large loss of capital expenditure. Efforts to remove the sediment by excavation and dredging are prohibitively expensive and not feasible, depending on the size of the containment. While most dams and river weirs are provided with sluice gates to scour out sediment, they have proved to be effective only for a small, localised cone of scouring around the sluice gate and do not desilt the dam or weir. The reason they are ineffective is that the sluice gates are mostly manually controlled and are not opened when the flood is running. Once the sediment settles and consolidates, it is difficult to sluice it out later, and particularly once reeds have established in the sediment and anchored it with roots. It then requires mechanical means to remove it. Not only do dams and weirs act as traps for sediment, but they also prevent the

150 million

cubic metres Itâ&#x20AC;&#x2122;s estimated that around 150 million cubic metres of sediment accumulates in our dams every year.

25 years The Tswasa weir on the Groot Marico River, which has a number of scour gates and crest gates to keep the pool feeding the pumping station relatively free of sediment. The system has been working well for more than 25 years.

transportation of much needed sediment downstream for the aquatic life in the river, as well as stabilise the banks against further erosion.

TOP A badly silted weir at an irrigation canal offtake, with denuded river bed downstream ABOVE Large spillway gate as a scour gate on the Runde River, Zimbabwe

Automatic gates Fortunately, there are automatic scour gates developed in South Africa, which largely overcome sedimentation build-

up in river weirs and small dams. These gates, produced by Amanziflow Projects, are designed to open when the flood runs,

IMIESA July 2018

Dams & Reservoirs

FROM LEFT TO RIGHT Scouring out on the Nsuze River weir for a pipe offtake to water treatment works in KwaZulu-Natal Larger scour gate for Neckartal abstraction works in Namibia Large scour gate for a 4 m wide by 2.3 m high scour tunnel in Namibia

so that sediment, in either suspension or rolling on the riverbed while it is in motion, passes through the scour tunnel through the wall and settles downstream where it belongs. These gates effectively keep weirs relatively free of sediment. Once the flood has passed and the water level recedes, the scour gates will close automatically to retain the full supply level in the weir or dam. It is also possible to fit these scour gates retroactively into existing weirs and low dam walls to allow the sediment to be sluiced out with successive flushes. This will recover a large amount of lost storage, and, once recovered, it will maintain that level of storage during future floods. This

would be useful, for example, in recovering storage in the Shongweni and Gilbert Eyles dams in KwaZulu-Natal, which are almost totally silted up, as well as for many other similarly highly silted dams and weirs around the countr y. These gates have been used effectively in South Africa and neighbouring countries to keep offtakes relatively free of sediment from rivers to pump stations, canals, and penstocks. The scour gates range from as small as a 0.6 m wide by 0.3 m high scour gate in the Tugela River for a pump offtake, to a large 4 m wide by 2.3 m high scour tunnel for river abstraction for irrigation on the Fish River in Namibia.

Guideline recommendations While these types of automatic scour gates keep the abstraction areas relatively free of sediment, much larger automatic scour gates are required to keep the whole containment behind the weir relatively free of sediment. The guideline is to provide an automatic scour capacity to pass the 1:2

year occurrence flood peak. This requires more such scour gates. A prime example is the Tswasa weir on the Groot Marico River, which has a number of scour gates and crest gates to keep the pool feeding the pumping station ser ving Gaborone relatively free of sediment. The system has been working well for more than 25 years. The other alternative, depending on the circumstances, is a large gate capable of passing large flows through the weir. One such gate is installed on the Runde River in Zimbabwe to effectively keep the weir free of sediment. This is a barrage-type gate that is 12 m wide and 4 m high. Sediment build-up is quietly, but increasingly, throttling our bulk water capacity and effective measures need to be implemented to either increase dams’ capacity to offset these losses, or remove sediment by successive sluicing and then to ensure that further sediment build-up does not occur. *Peter Townshend is the managing director at Amanziflow Projects.

IMIESA July 2018

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Waste Management

Waste governance and sustainability

DID YOU KNOW? Doing nothing about waste will have devastating health and environmental impacts. And, there are enormous opportunities for waste recycling and secondary industries to mitigate these effects.

he Africa Waste Management Outlook (WMO) repor t recently released by the UN Environment Programme (UNEP) and the CSIR provides an in-depth analysis of the current situation, its impact on the continent, plus proposed solutions. According to the report, Africa currently recycles around 4% of the waste it generates. In response, the African Union has appealed to cities to commit to a figure of at least 50% by 2023 and to grow their waste recycling industries. “There is an urgent need for African countries to address the current waste

management challenges and to prepare themselves for the expected growth in waste generation in the coming century,” explains Professor Linda Godfrey, principal scientist at the CSIR and coordinating lead author of the report. Contributions were made by experts and researchers from across Africa. “This will require social and technological innovation, and investment in services and infrastructure in the waste and secondary resources sector never before seen in Africa,” Godfrey expands. Cecilia Njenga, head of UNEP, says the uncontrolled dumping of waste is one of the major challenges facing Africa. “The

• The urban population in Africa is increasing at a faster rate than any other continent (3.5% per annum) • Although waste generation is currently lower in Africa than in the developed world, sub-Saharan Africa is forecast to become the dominant region globally in terms of total waste generation (if current generation trends persist) • The African Union has called on African cities to commit to recycling at least 50% of the urban waste they generate by 2023 and to grow urban waste recycling industries. (Source: Africa Waste Management Outlook)

report sets a vision for Africa and we hope that this document will inform and inspire decision-makers from around the continent to preserve the environment.”

Uncontrolled dumping As the report highlights, waste management in Africa is often characterised by

IMIESA July 2018

Waste Management

“Reuse of end-of-life goods is already widespread across Africa, but often driven informally, with opportunity to scale up.”

Priority 1 & 2

Bring waste under control The first priority for Africa is to address the public health imperative by ensuring that all citizens have access to proper waste management services. Comprehensive, reliable and regular city cleansing and controlled disposal of waste are the foundation of every integrated waste management system.

Harness the opportunities of ‘waste as resource’ The second priority for Africa, to be addressed in parallel, is to unlock the socio-economic opportunities of waste as a resource, by moving it up the waste management hierarchy away from disposal towards waste prevention, reuse, recycling and recovery. (Source: Africa Waste Management Outlook)

uncontrolled dumping and open burning, with limited cases of disposal to sanitary engineered landfills, or diversion of waste away from landfill towards reuse, recycling and recovery. The total municipal solid waste (MSW) generated in Africa (in 2012) was estimated to be 125 million tonnes per year, of which 81 million tonnes (65%) was from sub-Saharan Africa. Waste generation in Africa

is projected to grow to 244 million tonnes per year by 2025. According to WMO findings, the average composition of MSW in Africa (sub-Saharan Africa) is about 57% organic, 9% paper/cardboard, 13% plastic, 4% glass, 4% metal and 13% other. Among the myriad streams, plastic waste is on the rise and poses a significant threat to the environment and economies. Going forward, the report stresses the need for more

IMIESA July 2018

Powering Nations

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Waste Management

comprehensive, better-quality data on the amount, sources, type and composition of wastes generated, which should be shared among member countries.

Public-private partnerships Sustainable waste management is one of the most expensive services provided by government. However, the WMO states that “the low priority often assigned to waste by key stakeholders, combined with communities’ unwillingness to pay for waste services, means that there is often no funding available to improve waste service delivery and invest in waste infrastructure.” One of the report’s recommendations is for governments to proactively involve specialist private sector entities in their future waste management strategies. “Governments need to explore how partnerships can be encouraged through such things as economic

incentives and land allocations,” states a WMO extract.

e-Waste Another area highlighted by the WMO is the issue of e-waste, with Africa being a major destination for used electrical and electronic equipment. As the report states, “The huge hauls of e-waste are becoming a flourishing business, and the main source of income for a considerable number of Africans, despite the potential risks involved.” Trade in end-of-life equipment is turning waste into more sustainable resources, conserving valuable materials while creating a new class of African entrepreneur. However, the report points out that the lack of a legislative body for the trade is creating many gaps and logistic flaws, with potential for significant human and environmental impacts.

In response, the recommendation is that countries involved in this trade should revisit their regulatory frameworks and assess whether mechanisms need to be put in place to address illegal imports. Looking ahead, there are major business opportunities. The WMO says that, at a conservative estimate, the value of MSW generated in African urban areas is approximately US$8 billion (R110 billion) annually, of which US$7.6 billion worth of valuable resources (96%) is currently lost through the disposal of waste each year, typically to open dumpsites, with associated burning. The report states that this takes into account only a limited set of waste streams and should, therefore, be seen as a conservative, lower-bound estimate. Either way, it’s clear that the potential in Africa to develop a ‘waste as secondary resource’ approach is still largely unexplored, and that presents exciting opportunities. For the full report, visit www.csir.co.za /documents/africa-wmo-reportpdf IMIESA July 2018

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Roads & Bridges

Upgrading the ‘river route’ A design and construction approach proves challenging, but the end result is a worldclass road that provides a vital link for deser t communities.

he lack of a road transportation link between the !Kharas Region town of Oranjemund in the far south of Namibia and the rest of the countr y has been a controversial issue since the 1990s. Residents of Oranjemund have had to drive across the Orange (Gariep) River via the border post on the B1 at Noordoewer (past Port Nolloth and Steinkopf in South Africa) in order to access routes onwards to the major centres of Namibia. This increased the travel times to and from Oranjemund to anywhere else in the countr y by a significant amount. Following prefeasibility and feasibility studies undertaken prior to 2000, the Namibian government decided that a bitumen road link to the national road network between Oranjemund and Lüderitz would suit neither the operation at Rosh Pinah nor at Skorpion, situated approximately 25 km apart. The government also decided that a road via Lüderitz would not improve the road conditions for traffic using the national gravel road along the Orange River between Noordoewer and Rosh Pinah. The latter ser ves the Rosh Pinah/ Skorpion mines and the commercial grape production unit at Aussenkehr, as well as various tourism lodges and canoeing recreational facilities along the Orange River. A subsequent fact-finding study to investigate a direct link between Rosh Pinah and Oranjemund, so that people could avoid travelling through the diamond mining deposits along the Orange River, once again favoured the upgrading of the existing Namdeb private road along the north bank of the river, rather than the construction of a whole new route altogether. The overall rationale for this conclusion concerned the tourism potential of the extremely beautiful scener y along the Orange River; the potential practical difficulties in crossing the ver y high Obib sand dunes and other parts of the pristine Namib environment; and – importantly – the fact that diamond

Blowing sand off newly laid bitumen

Raising the level of the ‘river road’ Road works next to the Orange River

Roads & Bridges

mining in the area will one day be phased out, leaving the countr y with the responsibility of maintaining the existing gravel road in addition to any new direct bitumen road. A decision was ultimately made to upgrade the ‘river route’ to a bitumen surface, which would be known as Main Road 118.

Upgrade design and construction In Januar y 2014, the Roads Authority contracted Raubex Namibia Construction to undertake the road works, and VKE Namibia Consulting Engineers (part of the SMEC Group) to carr y out the design work and super vise the construction phase. The Roads Authority had been compelled to accelerate the planning and construction of the road, which led to the initiation of a ‘design-under-construction’ approach. Under this strategy, VKE Namibia found it quite a challenge to provide timely design information to the contractor, who was placed under pressure to comply with a programme that could not be

planned for accurately in the absence of a completed design.

Weather challenges During sandstorms, public traffic became stuck in thick sand deposits on the temporary route diversion, with visibility limited to only tens of metres at times. The strong winds occurring in the area also added thick layers of sand over half-completed work, which at times delayed progress, since corrective measures were needed to address the damage caused by the sand. A temporar y water storage dam ended up being partially filled with wind-blown sand and had to be reconstructed. Buried PVC pipelines were exposed by wind and damaged, causing disruptions in the supply of pumped construction water to the work site. During construction, it required nearly daily cleaning of each pavement layer and bitumen application prior to the contractor continuing before the wind speed picked up again in the afternoon. The contractor understandably repor ted

endless frustration with sand removal over sections of the road. Additional challenges included high-risk rock, which had to be removed using extensive drilling and blasting and, on occasion, by applying high-pressure water jetting to soften up the inter-layers to reduce internal friction, followed by secondary blasting. The road height along the Orange River needed to be raised above the highest water level recorded in 1974, when both the Orange and Fish Rivers came down in full flood. The southern part of the Namib Desert has become much more accessible with the upgrading of the 99 km main road between Rosh Pinah and Oranjemund. The project significantly reduces time and travel costs for the residents of Oranjemund, increases potential tourism growth and has been designed to withstand sandstorms, flooding and other challenges. The road, now completed, is of a ver y high geometric standard with an excellent riding quality, and complements the beautiful natural scener y of southern Namibia. IMIESA July 2018

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Roads & Bridges

Surfacing the city

Technology is the key to bridging Johannesburg’s infrastructure gap when it comes to road construction and maintenance and, with it, a renewed focus on improving economies of scale. That requires well-thought-out capex decisions in terms of mechanisation.

OLD

LEFT The JRA’s old plant, erected in 1965, had become a hazard and was too inefficient to meet the city’s infrastructure programmes BELOW The new Intrame RM200 hot mix batch plant is designed to cater for 40% recycled asphalt mixes and has a 200 tph output capacity

NEW

IMIESA July 2018

Roads & Bridges

Company overview

he commissioning of the Johannesburg Roads Agency’s (JRA’s) new Intrame RM200 asphalt batch plant, which is under way, represents a major milestone in meeting a wide range of delivery targets set by South Africa’s largest city. This modern and high-tech plant replaces a longstanding unit that has been in service since 1965 and has undergone at least two major revamps along the way. Although originally designed for an output of 120 tonnes per hour (tph), the old plant’s capacities in recent times have often been below 50 tph, significantly impacting on contracting efficiencies. The old plant had become totally unsuited for the JRA’s requirements, both in terms of production output, as well as from a health, safety and environmental perspective. The JRA needed to take a decision either to go the third-party route, sourcing from the open market, or retain its in-house capabilities. Since further refurbishment was not an option, the JRA embarked on a series of feasibility studies. The JRA sent out a request for proposal (RFP) document and the aim from the onset was to acquire the best solution. Independent consultants were also asked for their input

MICROZONE TRADING 1345 (PTY) LTD is a construction company established in 2002 to provide the market with highend integrated general building, civil, mechanical, and electrical construction and engineering services. The company is 50% black women owned.

Core services

MICROZONE TRADING 1345 (PTY) LTD oﬀers a comprehensive basket of construction services within the ﬁelds of: • Civil infrastructure • Mechanical construction • Building construction

Johannesburg’s road challenge Gravel roads make up 1 168.53 km of the city’s 13 599 km road network. As per the 2017 roads condition study, 72% of gravel roads are in a poor or very poor condition and require reshaping and regravelling. A total of 2 852 km of surfaced roads require resurfacing and 3 968 km of very poor and poor roads require reconstruction. The city is presently faced with an R11.8 billion backlog required for the surfacing and gravel roads upgrades. A total of R7.1 billion is required for surfaced roads and R4.7 billion for the upgrading of gravel roads to tar. For the 2017/18 financial year, the JRA has already upgraded 22.39 km from gravel to surfaced roads. (Source: JRA)

Providing quality services that add value to our clients

Contact details 49 Boxer road, Glen Austin, Ext 3 (011) 029 9201 / 083 707 0731 info@microzoneprojects.co.za

IMIESA July 2018

ASSOCIATED ASPHALT EQUIPMENT “Home of Innovative Technologies”

prior to finalising the RFP. A minimum capacity of 160 tph was specified with asphalt mix flexibility being a key requirement. The Intrame RM200 was selected as the optimal choice. The plant has a 200 tph output capacity and 40% recycled asphalt capability – the latter being an essential feature for the JRA’s future roads projects. Intrame is a Spanish original equipment manufacturer, founded in 1965 and represented worldwide. This is Intrame’s first plant installation in South Africa. The JRA is one of the few public entities nationally that operates its own asphalt plant, which passes on a key competitive advantage when it comes to lowering the cost of construction on its extensive gravel-toA total of 2 852 km of surface and resurfacing contracts. The JRA surfaced roads require also operates its own resurfacing and materials laborator y 3 968 km of very poor and is currently working towards ISO 17025 and poor roads require accreditation, which is reconstruction the industry standard for testing and calibration laboratories. The JRA has a memorandum of agreement in place with the University of Johannesburg, which will assist with the ISO 17025 accreditation process. Currently, the JRA operates two paving teams, with a third paver always on standby, and approximately 40 tipper trucks. The balance of the JRA programme is carried out by contractors, many of them SMEs.

Selling to the market According to the JRA, the intention is to use approximately 70% of the asphalt produced for its own projects and to sell the balance to its contractor base. The possibility of selling to smaller municipalities is also being considered, backed by technical support from JRA. For the 2018/19 financial year, the JRA has an asphalt production target of 150 000 t, of which approximately 40 000 t will be available to the open market. Overall, this is a major jump in productivity: the old plant could only manage around 80 000 t in the past financial year due to regular environmental restrictions, occupational hazards and costly breakdowns.

Plant erection Construction works for the establishment of the Intrame RM200 commenced in mid-2017 at the JRA’s depot in Booysens, south of the city. The project was undertaken by a joint venture between Associated Asphalt Equipment (AAE) and Microzone, which encompassed the civil works as well as supply, erection and commissioning. AAE installed the RM200 as part of a two-plant solution for the JRA. The second unit is a Romanelli UPMR cold-mix plant. The scope of works included the installation of separate storage tanks for each plant. Ground conditions during execution proved to be a major challenge, requiring a 3.5 m deep excavation to establish and stabilise the foundations for the RM200. JRA has overseen the project from inception to completion and now has the technology to deliver on world-class infrastructure.

www.asphalt-equipment.co.za

IMIESA July 2018

Environmental EngINEERING

Soft ground solutions Expansion plans at Aloe Oils’ East London facility have gone ahead following a cost-effective and sustainable solution to counter poor ground conditions on adjacent land earmarked for development. The latter site is underlain by a soft, pumping, high PI subgrade.

aytech provided an innovative construction technique incorporating our bidim geotextile and the unique TriAx geogrid together with a pioneer layer,” says Kaytech’s Julian Maastrecht, expanding on the methodology adopted. The use of bidim and TriAx eliminated the need to remove and replace a significant amount of material to create a stable working platform for the new layer works. The consulting engineers for the project were Sonnekus & Toerien. Allen & Clarke Civil Engineering cleared the site of vegetation and topsoil, exposing the inferior subgrade. Sheets of 5.3 m wide bidim A2 were then simply rolled out (with 400 mm overlaps) to cover the subgrade, and immediately overlaid with TriAx 160. The geosynthetic composite layer was then covered with a 500 mm compacted layer of recycled building rubble. In such an application, bidim A2 func-

ABOVE Large rocks were initially placed in the subgrade to create some stability BELOW Installation of bidim A2 over the subgrade

tions as a separator between the rubble and the low CBR subgrade. Although the small apertures of the rigid TriAx geogrid prevent complete intrusion of the rubble into the base, partial penetration of aggregate particles creates a positive mechanical interlocking action. This provides resistance to lateral shear, thus imposing a markedly improved maximum load-bearing capacity to the soft subgrade. From the time of placement of the loose material above the TriAx geogrid, mechanical interlock is immediately effective, negating the need for a minimum mass of overlying material to create frictional resistance. With the mechanically stable platform created, SL Contractors completed the expansion area with layers of G7

and C4 material beneath a 150 mm layer of reinforced concrete.

Construction material benefits Used worldwide in a variety of applications, bidim is a continuous filament, nonwoven, needle-punched geotextile. The needle-punching process passes on several benefits, including appreciable thickness, high porosity and a high drainage capacity, both within and normal to the plane. Kaytech’s ISO 9001 registered production facility in the Western Cape produces eco-friendly, polyester A-grade bidim geotextiles from recycled plastic bottles that meet the most stringent civil engineering and industrial specifications. Meanwhile, the rigid triangular structure of TriAx geogrids provides near uniform stiffness through 360 degrees and when combined with a suitable aggregate produces a mechanically stabilised layer of unsurpassed performance.

IMIESA July 2018

Building Systems

Sustainable brick expansion

orobrik has embarked on a multibillion-rand investment rollout to grow its business and develop new markets over the next six years. This includes future expansion in KwaZulu-Natal and the Western Cape, plus plans to build a new mega factory on Johannesburg’s East Rand. Currently, the company produces a billion bricks annually

An architect’s impression of Corobrik’s new Driefontein factory

and sells about four million per working day. Dirk Meyer, managing director, Corobrik, says the lion’s share of the initial R1 billion allocated for the 2017/8 period has been earmarked for a new R800 million plant that will be built alongside its existing Driefontein factory. Scheduled for commissioning in 2020, this new mega facility will have an envisaged output of around 100 million bricks annually – double that of

the existing factory and using only a third of the energy. In addition, the new operation will produce zero waste. Over the past decade, Corobrik has invested heavily in more sustainable equipment, including advanced extrusion technology, which reduces energy consumption while increasing brick’s fundamental integrity as a weatherproof and structural building material. IMIESA July 2018

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Consulting Engineers

Effecting change Effective, ethical leadership – this is CESA’s main message to help the consulting engineering industry recover this year. By Danielle Petterson

n average, South Africa has spent 6% of its GDP on infrastructure over the last 16 years, translating to roughly R300 billion each year. But despite this spend, many of Consulting Engineers South Africa’s (CESA’s) member companies are facing hard times, including retrenchments and spending cutbacks in areas like training, bursaries and corporate social responsibility, reported Neresh Pather, president, CESA, at his recent Gauteng presidential visit.

“On the face of it, procurement is at the heart of many of the current blockages. The National Planning Commission, through its workings, found that the emphasis of government procurement focused on compliance by box ticking, which made the system costly, burdensome, ineffective and prone to fraud. “These systems placed an excessive burden on weak support functions and focused on compliance instead of value for money. The current processes result in lengthy delays and blockages to the pipeline and delivery of projects. By virtue of the large government expenditure required, we need to ensure that the correct objectives are driven,” he said. Although the Standard for Infrastructure Procurement and Delivery Management (SIPDM) has now been adopted by all spheres of government, CESA is concerned

Neresh Pather, president, CESA

that there is no infrastructure directorate at National Treasury to take ownership of and accountability for the implementation and monitoring of compliance with this standard. Furthermore, SIPDM is not being driven by specific infrastructure specialists that should be capacitating the Auditor General’s office. “The lack of appropriate skills in both these departments needs to be addressed urgently if the value for money consideration of an

Lullu Krugel, chief economist, PwC

IMIESA July 2018

Consulting Engineers

annual R300 billion spent on infrastructure is to materialise,” Pather emphasised. Skills and competence are vital within South Africa’s state organisations, and this cannot be undertaken with a tick-box mentality, Pather warned. He called on industry organisations to work closely with the Engineering Council of South Africa (ECSA) in ensuring that the quality, integrity and rigour of the professional registration process are maintained. “The current impasse between the regulatory body ECSA and the voluntary associations (VAs) is unhealthy for our industry. The notion that either ECSA or the VAs can serve our industry in isolation is ludicrous and needs urgent attention. The Department of Public Works needs to hold ECSA accountable to ensure that the processes required for registering engineers and technologists are done in accordance with global best practice. It is impossible to be referee and player in this instance and a predefined role for the various organisations must be structured outside of the current dispute,” he said.

Leading the way This ties in with what Pather has identified as one of CESA’s main focuses for the year: ensuring effective, ethical leadership.

CESA’s five key objectives FOR 2018: 1. Ensuring effective, ethical leadership 2. Focusing transformation efforts on changing the hearts and minds of people 3. Embracing the Fourth Industrial Revolution, the new world of digitisation, and new ways of doing things through innovation and data-informed techniques 4. Focusing on industry integration and working collaboratively on common issues that benefit our industry and society 5. Working with clients in addressing corruption, governance, and client leadership

IMIESA July 2018

“South Africa has been fraught with the controversies of corruption, state capture, and economic decline. We have had to navigate through these troubled times and it is CESA’s firm belief that the answer to addressing these challenges is leadership,” he said. “Leadership starts with values and purpose, both of which are underpinned through governance and process.” Pather believes the key for the consulting engineering industry lies in education and professional competence, coupled with integrity. This requires ongoing skills development and training to skill more than one generation, to both develop skills that promote competitiveness as well as address the social imbalances of the past. He called for further youth and gender equality in order to achieve a future that is relevant and inclusive, together with a need to encourage black empowerment principles not as a means of compliance but to truly develop African industrialists, which will in turn grow economies. “We must challenge ourselves to constantly ask: ‘What does success look like and what is acceptable?’ This way, we will push ourselves to greater heights to allow South Africa to prosper and not only focus on compliance.”

Africa rising However, it is not all doom and gloom. According to Lullu Krugel, chief economist, PwC South Africa, the latest PwC CEO Survey shows that there is a lot of optimism around the global economy. The World Bank’s global economic outlook also shows optimism in the market, albeit cautious optimism in many cases. According to the World Bank, there is a three-year window in which the global economy is likely to see a strong expansion before there is a drop-off. This is positive news for the continent, and African economies are expected to have expanded by average 4% by the end of this three-year period, said Krugel. However, she believes the perception around African economies needs to change, because they are not growing in the same way as Asian economies, as was expected. There has, however, been significant growth.

In fact, on average, over the last 20 years, Ethiopia has been the largest growing economy in the world. Back in 2008, the ratio of the size of South Africa’s economy to Ethiopian’s was 15:1. It is now 6:1. If Ethiopia continues to grow at the same rate, it will take only 30 years for it to become the biggest economy in Africa, reports Krugel. On another note, Rwanda climbed 100 places in the World Bank’s Ease of Doing Business ranking, while South Africa dropped 40 places. Although Rwanda will never have one of the largest economies, it has done a lot to attract outside investment, becoming the second easiest country in which to do business in Africa, said Krugel. “We need to start thinking a little differently about the rest of the continent in terms of opportunities and where those opportunities are,” she said. While there is a growing middle class across the continent, the base level for entering the middle class is low. Therefore, while there are a growing number of people who need basic infrastructure, Krugel believes that, in some instances, business will have to create the market itself and learn how to stabilise this middle class in order to create this market. South Africa, like the rest of the globe, is seeing more positivity in both consumer and business confidence. For the first time in years, all forecasters have revised their forecasts for South Africa upwards. However, Krugel warned that if many of South Africa’s challenges are not addressed, the country’s growth will be capped at around 2.5%. If they are addressed, she believes South Africa could reach 3% to 4% growth.

Our future is now In line with CESA’s theme for 2018 – ‘Our future is now!’ – Pather believes change can be effected if the industry believes in it and works hard to achieve it. “We can transform our beautiful country. We need to stand together, shoulder to shoulder, dedicated and stamina-filled. Equals in gender, equals in race and equals in stature, while embracing technology and change. With great leadership, we can succeed. It is Ke Nako again. Our future is now,” he concluded.

Cement & Concrete

The art of additives The properties of plaster in both fresh and hardened states depend, to a large extent, on the properties of the materials used. Bryan Perrie, MD of The Concrete Institute, expands on the role of additives in plaster and factors to bear in mind before specifying their inclusion.

everal additives are used in the manufacture of sandcement mixes for plaster. These include hydrated builder’s lime; admixtures, most commonly plasticisers; bonding aids; and pigments. Hydrated builder’s limes, in their calcitic lime and dolomitic forms, are both available in South Africa, depending on location. Builder’s lime must comply with SANS 523 (type A2P) and is used to improve workability, plasticity and water retentivity of mortars and plasters. Up to one bag (25 kg or 40 ℓ measured loose) may be used per bag of common cement. The quantity added depends largely on the fines content of the sand, but builder’s lime should not be used with masonry cement. Lime tends to increase the water requirement of the

plaster and, therefore, reduces the compressive strength slightly. However, the improved workability and water retention result in better bonding and lower permeability. As a rule, lime is more expensive than cement. In any event, South African limes are non-hydraulic and cannot be used to replace cement in the mix.

Bryan Perrie, MD, The Concrete Institute

air-entraining agents. On no account should these air-entraining agents be used with masonr y cements.

Chemical admixtures Chemical admixtures are used in plaster mixes to improve workability and water retention. The admixtures should comply with SANS 50934 and their dosage must be properly controlled to avoid adverse consequences. The most commonly used admixtures are mortar plasticisers, which are in fact

Bonding aids Bonding aids (or bonding liquids) are often used in plaster mixes, and in spatterdash applications for bonding plasters to substrates. These must be used strictly in accordance with manufacturer’s instructions. Bonding aids can be very effective, but only if the substrate has been properly prepared. They are, by no means,

IMIESA July 2018

Cement & Concrete

a substitute for good surface preparation and workmanship, but they do impart good workability to the mix, although overdosing can lead to low strength.

Pigments Used to add colour to plaster, pigments should comply with BS EN 12878 or an equivalent quality standard. The pigments must be alkali-tolerant and, if the plaster is to be exposed to sunlight, ultravioletresistant, and should not unduly increase the water requirement of the mix. Pigments for use with Portland cements are available in powder and liquid forms in a variety of colours, and are normally inorganic metallic oxides. Caution should be exercised when using carbon black as a pigment, as it tends to fade with time. For any given combination of cement and sand, the dosage depends on the pigment colour and the desired final colour of the plaster. Each pigment has a saturation dosage, above which the colour of the mix remains the same. Dosages over the

The dosage of pigmentation added to plaster will determine the final colour of the surfaces

saturation dosage not only waste pigment but can also weaken the mix by increasing the water requirement. For uniform colour, the pigment should be thoroughly mixed with the cement prior to mixing with the sand. Machine mixing is preferable, if not essential. Variegated colour effects are also possible by partially mixing one or more additional pigments into the mix. Note that both the sand and cement colour can have a distinct effect on the final colour, as can the amount of mixing water. It is therefore important, particularly for pigmented plasters, that both the sand and cement are obtained from one consistent

source prior to commencing work, and that the batch quantities are carefully controlled. An essential requirement in the case of white or pigmented plasters is that the sand be free of organic matter in the form of roots, twigs, humus, seeds and plant resins, as these can cause localised retardation, staining and pop-outs. On a practical note, a very important aspect to consider when specifying pigmented plasters is that it is impossible to patch them without the patch being visible. This means that all plumbing, electrical and other fixtures must be completely installed prior to plastering.

IMIESA July 2018

ENDING EROSION Technicrete Armorflex erosion control system provides an alternative for a wide variety of erosion control and drainage projects. When your project calls for protection that can withstand severe applications and climatic conditions, with quick installation with no in-situ concrete or even under water, Armorflex from Technicrete is the engineered solution. Suitable for:

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Cement & Concrete

Water for Warden

he Cornelis River Dam, situated 56 km north of Harrismith, was built to meet potable water requirements in Warden/Ezenzeleni, with the 18-month project scheduled for completion in Q2 2018. Sika’s range of concrete repair and protection products formed a core component, with its SikaPlast V220 and Stallion 2 admixtures specified for the readymix pours. In order to grout the anchor rods into the rock to create the steps, Intraplast-Z was used. This is an admixture designed to introduce micro bubbles into the grout mix, to create wet volume expansion and increase fluidity without segregation. As a curing agent to prevent premature water loss, Sika’s Antisol E was sprayed on to areas of mass concrete. Forming a thin film barrier, this ready-to-use liquid curing compound does not disturb the normal setting action of concrete,

which is then allowed to cure and achieve maximum properties. The structure was primed with Sikagard-550 W Primer prior to the application of Sikagard-550 W Elastic, an acrylic-based, emulsified, high-build protective coating providing a durable covering with excellent resistance to weathering.

Chemical and abrasion resistance As a surface hardener for concrete, Sikafloor CureHard-24 was selected for the spillway. This easy-to-apply compound reduces dusting of concrete floors and improves chemical and abrasion resistance compared to untreated concrete. The concrete wall was treated using Sika MonoTop-610, an easy-to-apply cementitious, polymer-modified, one-component slurry. This high-quality primer acts as an excellent bond for Sika MonoTop-612, a highstrength repair mortar containing silica fume and

synthetic fibre reinforcement. Providing excellent slump resistance, it is particularly suitable for application on overhead and vertical surfaces. Sika Waterbar Type O-20 was centrally placed in all the expansion joints. The product is manufactured from virgin thermoplastic PVC for strength and flexibility, as well as easy on-site welding. Internationally tested Sika Waterbars are used to seal construction and expansion joints in all water retaining structures. They are designed to withstand high water pressure and are supplied in rolls of various widths and types Used as admixtures for structural and blinding concrete, Sika Plast Stallion-2 and Sika Plast V220 were specified as multipurpose water reducers and superplasticisers, utilising Sika’s ViscoCrete polycarboxylate polymer technology. Its higher ultimate strengths allow for greater engineering design, flexibility and structural economies.

CALL FOR NOMINATIONS for IMESA Members to serve on Council from October 2018 to October 2020

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Please complete the form below and fax to (031) 266 5094 or email to admin@imesa.org.za before 16:00 on Tuesday, 31 July 2018. If you have any queries, please contact Ingrid Botton on (031) 266 3263 or admin@imesa.org.za

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Cement & Concrete

Stormwater integrity

A strong foundation for infrastructure success

torms and the resulting flood water can carr y toxic particles such as oil, pesticides, pet waste, fertiliser and other such potentially threatening pollutants into local rivers, dams and municipal water ser vices, creating a breeding ground for diseases that could seriously affect the health of humans and livestock. Effective stormwater management can prevent pollution, flooding, erosion and damage to the environment and infrastructure. Therefore, it makes financial sense for municipalities to invest in products and technologies that ensure structural integrity and downstream sustainability. Rocla has been contracted for the supply of precast concrete stormwater pipes to numerous projects over its past 100 years in operation. These range from Mozambique to Cape Town, where the installations have stood the test of time. Stormwater pipes with both interlocking and spigot and socket joints are available in a range of strength ratings. The spigot and socket joints utilise the rolling rubber ring principle where no installation lubricant is required. All pipes conform to the SANS 677 standard. After consultations with Rocla’s technical team, interlocking joint pipes were selected for installation at the Great North Plaza in Limpopo, while the Bor wa project in Westonaria selected Rocla spigot and socket joint stormwater pipes. Technical support from Rocla ensured that the correct product and technology was selected, with consideration for the financial constraints of each project.

Rocla’s entire product offering is manufactured to the ISO 9001:2008 standard at various plants throughout South Africa, Namibia and Botswana

ROCLA is South Africa’s leading manufacturer of pre-cast concrete products. Surpassing 100 years of product excellence, including pipes, culverts, manholes, poles, retaining walls, roadside furniture, sanitation and other related products within infrastructure development and related industries.

Visit us on www.rocla.co.za for our nationwide branches IMIESA July 2018

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Transport, Logistics, Vehicles & Equipment

Renewed compaction focus

ynapac is poised to further strengthen its position as a global frontrunner in the manufacture and supply of equipment for the roadbuilding and civil industries, following its acquisition by the Fayat Group in October 2017. The two entities each have over 60 years of experience in the construction industry, with Dynapac acknowledged as a leader in paving and compaction technology, exporting worldwide via its fabrication centres in Sweden, Germany, China, India and Brazil. “We aim to extend our presence, directly and indirectly, to serve and support our customers all over South and Southern Africa,” affirms Thierry Leder, regional GM: Middle East and Africa, Dynapac. South Africa is a key market for Dynapac in the heavy and light compaction equipment sectors where aftermarket solutions and technical BWE lubricants Campaign - IMIESA - 148point5by210 - Print ad.pdf

support remain a primary focus for the company. Dynapac’s new light compaction equipment consists of a full range including tampers, forward and reversible plates, walk-behind and articulated utility rollers. “We broadened our product portfolio with the launch of a new range of light compaction equipment in February 2018,” states Leder. “Q2 2018 saw product introductions that focus on the most popular models to meet market demands. The complete range will be available by the end of 2018,” he adds. With digitalisation now the way of the future, new state-of-the-art technologies are increasingly being incorporated into the Dynapac product portfolio in order to offer customers improved efficiencies for maximum productivity. Currently, technologies such as Dyn@link or Dyn@lizer are available within the product portfolio, with more to follow.

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IMIESA July 2018

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Transport, Logistics, Vehicles & Equipment

Compacting redefined Providing optimal compaction with fewer passes, field trials also confirm major fuel consumption savings on JCB’s latest generation 11 t roller.

CB’s tried and tested VM115 single-drum compactor has been reconfigured and now comes to market as the JCB 116 D, in the process setting a new benchmark for machine performance in its class. “JCB took what was good and made it even better: a machine that delivers what really matters most for end-users, namely lowest overall total cost of ownership through productivity, uptime, fuel efficiency, operator comfort and safety, and effortless servicing,” explains Mark Senyard, national support and marketing manager, Kemach Equipment. Alongside a thicker drum (28 mm) and a 500 kg (4.6%) increase in operating weight, to 11 350 kg, improved weight distribution sees an

IMIESA July 2018

increase on the front load to 6 350 kg (57% on drum). Vibrating mass has also been increased by 11% to reach 3 610 kg, while a 13% increase in centrifugal force ensures very high performance. Furthermore, drum isolation has been optimised to ensure maximum energy transfer to the soil. The improved frame thickness to 40 mm also lends a more rugged and robust shape. The compactor’s 85 kW JCB Dieselmax 444 engine – which operates with a mechanical, direct fuel-injection system – is 5% more fuel efficient than other machines

of the same size on the market. Tests have confirmed fuel consumption figures of 8 ℓ/h to 9 ℓ/h during highway compaction. An innovative redesign of the bonnet provides better operator visibility and subsequently improves safety. The JCB 116 is available with a canopy or a full ROPS/FOPS cab with air conditiong. LiveLink is standard and a compaction meter is optional.

Transport, Logistics, Vehicles & Equipment

The SEM 822 features a flattracked undercarriage system equipped with hydrostatic drive

his year, SEM celebrates its 60th anniversar y – a major milestone for this Chinese OEM, which is wholly owned by Caterpillar Inc. In South Africa, the brand is supplied and supported by Barloworld SEM, a sister entity to Barloworld Equipment, which is Caterpillar’s Southern African dealer. “Market acceptance for the SEM range has been excellent, and we now have 25 established sub-dealer outlets in South Africa,” explains Barr y Fang, business manager for Barloworld SEM. “We continue to research the best locations for our ongoing dealership roll-outs, and have so far identified a further 10 locations.” The SEM parts inventor y for South Africa is now housed at Caterpillar’s new distribution warehouse in Gauteng. This centre ensures dedicated and guaranteed SEM component availability. Dealers, in turn, are required to meet minimum stockholding requirements for routine machine ser vicing requirements. Fang says a key competitive factor for SEM is the high level of quality purposebuilt into each machine, along with competitive pricing, making the brand

Together for future success increasingly popular in South Africa. Major markets include agriculture, mining, construction, quarr ying and the broader materials handling segment. “We’re achieving particularly strong sales for our wheel loaders,” Fang continues. “According to the latest market intelligence, our SEM 3 t loader has an almost 50% share of the 3 t class.” SEM’s latest generation 919 motor grader – launched towards the end of 2017 – is also gaining ground and comes with a 36-month standard warranty. This reinforces the confidence SEM has in its research and development programmes. “Barloworld SEM is now investigating ways to add further value to its machine range, which could include the introduction of optional ser vice plans,” he explains. Locally, Barloworld fields a selected range of SEM products, although the full OEM line-up is available ex factor y from China. Current machine classes comprise wheel loaders, graders and dozers. The SEM 816 and 822 dozer models were among a range of machines showcased at the recent bauma CONEXPO AFRICA 2018. Further plans going into 2019 include the local introduction of an 11 t class soil

SEM origins Caterpillar (Qingzhou) Ltd, formerly Shandong SEM Machinery Co, Ltd, was founded in Qingzhou City, Shandong, in 1958. Some 60 years later, the SEM brand has become a market leader in China, and a growing force worldwide. SEM formally joined Caterpillar in 2008. In 2016, Caterpillar and its brand council approved the endorsement ‘SEM – A Caterpillar Brand’.

compactor to meet demand in the roads construction sector. “The official SEM slogan for our 60th anniversar y is ‘Affordable, Available and Supported’. It definitely underscores our commitment to long-term customer satisfaction in South Africa,” Fang concludes.

IMIESA July 2018

Transport, Logistics, Vehicles & Equipment

Yellow metal and public fleets Nigel Webb, head, Latitude Fleet Services

The management of capital equipment requires detailed knowledge and a clear understanding of future costs. This will influence the decision to go for an outright purchase, rental agreement or outsourcing. By Nigel Webb

he high asset cost and necessity of maintaining ‘yellow metal’ availability within public sector fleets make their management a challenge. The term yellow metal commonly refers to earthmoving machines like graders, wheel loaders and backhoes. Yellow equipment is expensive and its value is far in excess of any other vehicle in a fleet. Fleet replacement budgets within public sector fleets are always limited, and dedicating a large chunk to a single machine is a difficult decision. The funding method for yellow fleets has many complications. Hour usage is generally low, so it’s not practical to use the replacement timing benchmarks for this machine class. Therefore, their selection cannot be made without knowledge of usage needs, operating conditions and the new vehicle’s expected useful life. Consulting the supplier is recommended, as they are frequently able to support a number of acquisition options.

Cash or lease route? Funding with cash will impact on available financial resources, while an operating

lease, which utilises a future residual value at the supplier’s risk, will reduce the monthly rental costs. However, an operating lease may result in the vehicle not being utilised for its useful life, which can make this option more costly. Low utilisation due to infrequent or seasonal usage can result in these vehicles standing idle for extended periods, which questions the need for ownership/acquisition. Rental (daily or monthly) may be an option to meet these needs, but it is expensive. Therefore, outsourcing the service to a contractor may be an option. Used equipment is also a consideration, but it is in the second phase of its life, with exposure to increased maintenance costs, and a shorter lifespan. Both factors will contribute to higher monthly costs.

Telematics Usage of these vehicles is best managed using top-end telematics systems. This can establish time usage but, importantly, can be extended to give engine performance notifications and warnings. This ultimately contributes to best preventative maintenance practices. During routine operations, moving this equipment to a workshop is often costly and impractical. Your own facilities may not be equipped to maintain the vehicles. For this reason, it may be advisable to secure a maintenance agreement with the supplier,

IMIESA July 2018

whereby servicing is undertaken by them at your facilities and possibly in-field. This is especially important once the standard OEM warranty expires.

When to replace Low utilisation, combined with the initial high capex investment, motivates fleet managers to delay replacement decisions for as long as possible. However, you still have to factor in wear and tear over this period. For example, excessive idling during machine operations can result in premature engine life on low-hour machines long before the OEM’s recommended component change-out recommendations. This results in subsequent exposure to unscheduled mechanical repairs and downtime, often resulting in expensive short-term rentals. Strictly adhere to OEM service schedules. The management of fuel is also complicated by location and usage. Many of these vehicles require on-site refuelling. Their rate of fuel consumption and area of usage expose the municipality to potential losses, so controlled and measured refuelling processes are required. Best practice here similarly contributes to reduced maintenance costs by ensuring that fuel quality is achieved. By carefully studying all the parameters, the end result is an optimum cost solution for municipal delivery. That, of course, also depends on dedicated operator training.

PROFESSIONAL AFFILIATES AECOM siphokuhle.dlamini@aecom.com Afri-Infra Group (Pty) Ltd banie@afri-infra.com AJ Broom Road Products ajbroom@icon.co.za ALULA (Pty) Ltd info@alulawater.co.za AQUADAM (Pty) Ltd sales@aquadam.co.za Arup SA candice.thorne@arup.com Aurecon Fani.Xaba@aurecongroup.com Aveng Manufacturing Infraset cgroenewald@infraset.com Averda claude.marais@averda.com Bigen Africa Group Holdings otto.scharfetter@bigenafrica.com BMK Group brian@bmkgroup.co.za Bosch Munitech info@boschmunitech.co.za Bosch Projects (Pty) Ltd mail@boschprojects.co.za BVI Consulting Engineers marketing@bviho.co.za Civilconsult Consulting Engineers mail@civilconsult.co.za Corrosion Institute of Southern Africa secretary@corrosioninstitute.org.za Development Bank of SA divb@dbsa.org.za DPI Plastics mgoodchild@dpiplastics.co.za EFG Engineers eric@efgeng.co.za Elster Kent Metering Leonardus.Basson@honeywell.com ERWAT mail@erwat.co.za Fibertex South Africa (Pty) Ltd rcl@fibertex.com GIBB yvanrooyen@gibb.co.za GIGSA secretary@gigsa.org GLS Consulting nicky@gls.co.za Gudunkomo Investments & Consulting info@gudunkomo.co.za Hatch Africa (Pty) Ltd info@hatch.co.za Henwood & Nxumalo Consulting Engineers cc pmboffice@hn.co.za Herrenknecht schiewe.helene@herrenknecht.de Huber Technology cs@hubersa.com Hydro-comp Enterprises dan@edams.co.za I@Consulting louis_icon@mics.co.za INGEROP mravjee@ingerop.co.za Integrity Environment info@integrityafrica.co.za IQHINA Consulting Engineers & Project Managers info@iqhina.co.za iX engineers (Pty) Ltd hans.k@ixengineers.co.za JBFE Consulting (Pty) Ltd issie@jbfe.co.za JG Afrika DennyC@jgafrika.com KABE Consulting Engineers info@kabe.co.za Kago Consulting Engineers kagocon@kago.co.za Kantey & Templer (K&T) Consulting Engineers info@kanteys.co.za Kitso Botlhale Consulting Engineers zimema.jere@gmail.com Knowledge Base info@knowbase.co.za Lektratek Water general@lwt.co.za Lithon Project Consultants (Pty) Ltd info@lithon.com Makhaotse Narasimulu & Associates mmakhaotse@mna-sa.co.za Malani Padayachee & Associates (Pty) Ltd admin@mpa.co.za M & C Consulting Engineers (Pty) Ltd info@mcconsulting.co.za

Maragela Consulting Engineers admin@maragelaconsulting.co.za Marley Pipe Systems info@marleypipesystems.co.za Martin & East gbyron@martin-east.co.za Masithu Consulting & Project Management info@mcpm.co.za Mhiduve adminpotch@mhiduve.co.za Mogoba Maphuthi & Associates (Pty) Ltd admin@mmaholdings.co.za Moedi Wa Batho Consulting Engineers (Pty) Ltd info@wabatho.co.za Mott Macdonald Africa (Pty) Ltd johannesburg@mottmac.com Much Asphalt bennie.greyling@muchasphalt.com NAKO ILISO hans.hartung@nakogroup.com Nyeleti Consulting ppienaar@nyeleti.co.za Odour Engineering Systems mathewc@oes.co.za Pumptron info@pumptron.co.za Royal HaskoningDHV francisg@rhdv.com SABITA info@sabita.co.za SAFRIPOL mberry@safripol.com SALGA info@salga.org.za SAPPMA admin@sappma.co.za / willem@sappma.co.za SARF administrator@sarf.org.za.co.za SBS Water Systems mava@sbstanks.co.za Sembcorp Siza Water info-sizawater@sembcorp.com Sigodi Marah Martin Management Support lansanam@sigodimarah.co.za SiVEST SA garths@sivest.co.za Sizabantu Piping Systems (Pty) Ltd gregl@sizabantupipingsystems.com SKYV Consulting Engineers (Pty) Ltd kamesh@skyv.co.za SMEC capetown@smec.com SNA stolz.j@sna.co.za Sobek Engineering gen@sobek.co.za Southern African Society for Trenchless Technology director@sasst.org.za Southern Pipeline Contractors (Pty) Ltd spc@vinci-construction.com SRK Consulting jomar@srk.co.za Syntell julia@syntell.co.za TECROVEER (Pty) Ltd info@tecroveer.co.za TPA Consulting roger@tpa.co.za Ulozolo Engineers CC admin@ulozolo.co.za UWP Consulting nonkululekos@uwp.co.za V3 Consulting Engineers (Pty) Ltd info@v3consulting.co.za south-africa@vetasi.com Vetasi VIP Consulting Engineers esme@vipconsulting.co.za VUKA Africa Consulting Engineers info@vukaafrica.co.za Water Institute of Southern Africa wisa@wisa.org.za WAM TECHNOLOGY CC support@wamsys.co.za Water Solutions Southern Africa ecoetzer@wssa.co.za Wilo South Africa marketingsa@wilo.co.za WRP ronniem@wrp.co.za WRNA washy@wrnyabeze.com WSP Group Africa sam.herman@wspgroup.co.za

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IMIESA July 2018

International Exhibition and Conference Trenchless Technology l Underground Infrastructure l Pipeline Technologies Take part in South Africa’s only specialist showcase of trenchless technology, combined with Cape Town’s host of tours – this is one not to be missed. Visit the exhibition free of charge. ISTT’s 36th Annual International No-Dig Conference and Exhibition, hosted by the Southern African Society for Trenchless Technology (SASTT)

8-9 October 2018

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The cycle of solutions – water technology by KSB Water is crucial for our survival – for every one of us, for all nations and peoples. Clean water supplies and efficient sewage treatment have never been more important. Prosperity and well-being depend on it, worldwide. KSB’s know-how and extensive pumps and valves product range help you meet all water supply and treatment requirements, efficiently and affordably. We are one of the few suppliers worldwide with end-to-end solutions addressing all stages of the water cycle – from water extraction to sewage treatment. www.ksb.com/cycle www.ksbpumps.co.za Tel: +27 11 876-5600

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