Pipes, Pumps & Valves Africa Mar-Apr 2019

ENDORSED BY SAPMA, SAPSDA, SAVAMA AND VAMCOSA

MAR/APR 2019

1 valve, customised for many applications.

bauma report back Understanding centrifugal pumps Back to basic: Mechanical Seals

Standardised

Customised

Systems-based

You choose. We supply.

Our wide range of standard pumps and valves provides plenty of scope for individual demands. You can select the materials, hydraulic systems and drives. When you’re facing complex tasks, we’re with you from Day One – whether you want planning guidance, specially designed components or help with commissioning. But see for yourself. Test our products for quality and versatility, and discover why KSB is so often first choice.

KSB Pumps and Valves (Pty) Ltd www.ksbpumps.co.za tel: +27-11-876-5600

Our technology. Your success.

Pumps

n

Valves

n

Service

One provider

CONTENT COVER STORY Paltech advanced valve technology

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PERSONALITY PROFILE Siyabonga Meyiwa

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ENDORSED BY SAPMA, SAPSDA, SAVAMA AND VAMCOSA

MAR/APR 2019

1 valve, customised for many applications.

PRODUCTS & SERVICES Veolia develops packaged treatment plant to treat borehole water in Stellenbosch

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PUMPS What you need to know about the Inlet Supply of your High Pressure Pump

10

The importance of maintaining your slurry pump

12

Multotec’s ceramic impellers to boost uptime at DRC mine

14

Pump efficiencies improve with bushings and wear rings

15

New laser cladding services for refurbishment of pumps and valves

16

Back to basic: Mechanical Seals

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Pumping systems training should be a requirement

20

Understanding centrifugal pumps

22

Powerful pump questions

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BAUMA REPORT BACK bauma report back

30

Wide range of robust fluid handling technology solutions

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Tsurumi launched new submersible pumps at bauma 2019 Xylem at bauma 2019: New solutions

33 34

VALVES Large irrigation schemes

36

ENERGYValves supplies turnkey valve solutions under the EMVAfrica banner

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Basics of industrial valves

40

INDUSTRY NEWS Conference to address IIOT at PVP expo

42

Electra Mining Botswana recognised as essential industry trade platform

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BUYERS GUIDE

40

Correction: It has come to the attention of Pipes, Pumps & Valves Africa that an article we published in the Jan/Feb 2019 issue: “The evolution of tradition” had the wrong caption on it. It is Thabiso, the workshop manager with Ruben van Loggerenberg and not Siyabonga Meyiwa, CEO.

bauma report back Understanding centrifugal pumps Back to basic: Mechanical Seals

On the cover Paltech

Tel: +27 (0) 12 653-1156 Email: sales@paltech.co.za Web: www.paltech.co.za

Pumps & Valves Africa

Managing Editor: Surita Marx Tel: +27 (0) 11 475-0010 Cell: +27 (0) 83 281-5761 Email: info@pumpsandvalves.co.za Web: www.pumpsandvalves.co.za Sales: Lusana Mrkusic Email: lusana@pumpsandvalves.co.za Sales: Kyle Rametsen-Spalding Email: info@pumpsandvalves.co.za

Advertisers

Ainsworth Engineering / UVC6 Air & Vacuum Technology 11,19,43 AMD Rotolok CS Atlas Copco 15 Caminex 35 CRI 21 Invincible Valves OBC KITE 8 KSB Pumps IFC Local Manufacturing Expo 17 Macsteel 7 Minetrack 29 Net Logistics 23 Paltech OFC PC Pump & Tank 37 Pumps, Valves & Pipes IBC SPX Flow 9 Stewarts & Lloyds 31 Thermaspray 39

Disclaimer

Opinions in this Publication are those of the authors and do not necessarily reflect those of this publication, its editorial board, its editor or its Publishers SAPMA. or VAMCOSA The mention of specific products in articles and advertisements does not imply that they are endorsed or recommended by this Publication or its publishers in preference to others of a similar nature, which are not mentioned or advertised. Reliance on any information contained in this journal is at your own risk.

While every effort is made to ensure the accuracy of editorial board makes no representations or warranties, express or implied, as to the correctness or suitability contained and/or the products advertised in this publication. The Publisher shall not be liable for any damages or loss, howsoever arising, incurred by readers of this publication or any other person/s. The Publisher disclaims all responsibility and liability for any damages, includes pure economic loss and any consequential damages, resulting from the use of services or products advertised in this publication. Readers of this publication indemnify and hold harmless the publisher, its officers, employees, and servants for any demand action, application or other proceedings made by any third party and arising out or in connection with the use of any services and/or products or the reliance on any information contained in this publication.

Pipes, Pumps and Valves Africa - Mar/Apr 2019

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COVER STORY

Paltech advanced valve technology Paltechnologies (Pty) Ltd is a proudly, 100% South African, majority black-owned, valve manufacturer and supplier. They primarily produce specialist Single and Double Eccentric High-Performance Butterfly Valves, and also make non-return & slurry sleeve valves.

Paltech develops innovative and high-quality valves for various applications that cater to a variety of industries.

Paltech specializes in providing solutions for their customers, working with them to design and develop special valves that match customer operating conditions. The company’s ongoing research and development of a unique design of butterfly valve, capable of handling higher pressures and temperatures and more aggressive process conditions than conventional butterfly valves, has earned them a reputation for technical excellence in the valve industry. Quality and service is what Paltech strives to provide to you, the customer.

Based in South Africa’s manufacturing hub, Centurion, Gauteng, the company’s service offering also includes valve repairs, refurbishments and non-destructive testing (NDT).

With over 30 years’ experience in the industry, Paltech boasts themselves on advancing valve technology. Their Pal-T Butterfly valve is testament to this. The flagship valve was made successfully through their dedication to develop the first domestically manufactured specialty aluminium transformer valve. These single and double eccentric butterfly valves are uniquely designed to shut off 100%.

There are endless advantages to using these valves.

The PAL-T Single Eccentric, Off-Set disc, self-energized seal, Butterfly Valve are well known and established throughout South Africa and neighboring African countries including overseas industrial markets.

Paltech had the following to say about their flagship product: “Due to the separate drive and stub shafts, the disc presents a smaller cross-sectional area to the flow which means a lower pressure drop when compared to conventional butterfly valves.

The shaft is sealed by means of double ‘’O’’ rings on both drive and stub shaft journals.

Both drive shaft and stub are aligned and supported by thermoplastic bearing to lower the operating torque of the valve. This results in smaller, less expensive actuators being able to be used, reducing the overall cost of the valve.

The disc/shaft connection is by means of an accurately located tongue and groove on both shafts. Other designs using taper pins or disc screws often fail through abrasion, corrosion or fatigue.

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

The shaft is securely retained, top and bottom, by means of screwed plugs, which is an improvement over circlip designs which may fail when high thrust loads are applied.

The one-piece wafer body conforms to all popular flange sizes in the range from PN10 to PN40 and DN 50 to DN 250 including ASME Class 150.

The face to face conforms for API 609 for universal interchangeability and the extended neck design allows for sufficient piping insulation.

Self-energized disc / integral sealing system.

Material & Sealing arrangement will be based on the Temperature and Media. Paltech supplies materials in accordance to EN or ASTM (Based on customer requirement).Testing done in accordance to API 598.”

COVER STORY

Benefits of a single eccentric butterfly valve:

Benefits of a double eccentric butterfly valve:

The seat is tilted relative to the spindle of the drive shaft.

The advantage of this is that the shafts do not pass through the valve body seal, as is the case with conventional butterfly designs.

The shaft is slightly offset from the centreline of the pipe and is also positioned behind the sealing area of the seat. In operation, the disc only contacts the seat for a few degrees of the movement just before the seating position, which is sufficient to affect a seal in a resilient sealing material.

The seat itself is located on the disc rather than the body. It is retained by means of the threaded retaining ring of the same material as the disc. This makes it easily replaceable and is available in a variety of polymeric material e.g.

UHMWPE, RTFE, PTFE, PEEK, etc.

The disc/shaft connection is by means of either a key or spline. Other manufacturers’ designs use taper pins or disc screws and often fail through abrasion, corrosion or fatigue.

Paltech Industrial understands that valves are essential parts to any piping system and used to control the flow and pressure of its contents, whether that is oil, gas, liquid or vapors. Subsequently, their valves are manufactured in a wide range of standard and exotic materials forming a product that is corrosion-resistant against various aggressive chemicals found in the day-to-day steel industry environment.

Their locally manufactured valves meet the requirements as set out by VAMCOSA of which the company is a member.

They are currently servicing South Africa, Australia, Netherlands, various countries in Sub-Saharan Africa.

Paltech markets the Posi-flate range of inflatable-seated butterfly valves, in Southern Africa, under an exclusive license.

Paltech, Tel: +27 (0) 12 653-1156, sales@paltech.co.za, www.paltech.co.za Pipes, Pumps and Valves Africa - Mar/Apr 2019

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PERSONALITY PROFILE

PERSONALITY PROFILE Siyabonga Meyiwa, CEO Ainsworth Engineering / United Valve Company Academic Qualifications: S1 Mangosuthu Technikon, A-levels Loughborough College; Bachelor of Engineering (University of London; King’s College)

First Employer: Illovo Sugar (Sezela Sugar Mill) Engineer in Training position

First Salary: Do not remember +/- R5 000

Achievements: Concluding a deal to buy Ainsworths Engineering

Challenges in Industry as far as pumps and valves is concerned: Competing against cheap imports from other countries.

Motivating personnel to perform to their true potential. Get funding to assist finance growth.

Advice to offer: Hard work never kills

Something fun nobody knows about you: I can be funny sometimes

as Consulting and Design Engineer, Ethusini Holding as General Manager for Engineering division, Non Executive Director Umgeni Water Board, etc

Number of people under your leadership:

Career history prior to current position:

60

Worked for Illovo Sugar as Engineer, Siyabonga Engineering

Participative

Management style:

Personal best achievement: Balancing work with life.

Professional best achievement: Being appointed CEO of Ainsworths Engineering

Person who has had the biggest influence on your life: My grandfather

Person who has had the biggest influence on your career: Richard Branson

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

Tel: +27 (0)11 383 4000

PRODUCTS & SERVICES

Veolia develops packaged treatment plant to treat borehole water in Stellenbosch

Veolia Water Technologies South Africa supplied a package plant for the treatment of water abstracted from two new boreholes at Cloetesville in Stellenbosch.

The Veolia packaged potable water treatment plant is a low-footprint, plug-and-play solution for meeting SANS 241 Drinking Water Standards.

The packaged potable water treatment plant (PWTP™ 050) will treat 54 m3 of water per hour, which is fed into the municipality’s bulk water supply.

Fabricated in just 12 weeks at Veolia’s Water Techno Packages facility in Sebenza, Johannesburg, utilising off-the-shelf Veolia technologies, the plug-and-play PWTP™ was a costeffective, efficient solution to rapidly supply the required treatment of borehole water to SANS 241 standards.

Water abstracted from the boreholes is pumped through an oxidation tank where manganese and iron are precipitated.

It’s then pumped through a set of pressure sand and multimedia filters for suspended particulates removal. The

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

12911 - KITE2019 VISPROM AD 180x65 LIFTING AFRICA PATHS.indd 1

water is then fed through activated carbon filtration, UV sterilisation and final polishing before being pumped into the municipal network. Veolia’s Hydrex™ chemical dosing is included in the various steps for process optimisation.

Veolia is currently responsible for an operations contract and is able to supply water treatment chemicals for the plant, independently of the municipal supply chain.

André Loots, Engineered Systems, Tel: +27 (0) 11 281 3610, andre.loots@veolia.com, www.veoliawatertechnologies.co.za

2019/04/30 16:03

ROTARY LOBE POSITIVE DISPLACEMENT PUMP

TOP LOBE PLUS Reliable performance with low-noise, robust, consistent, smooth displacement of product using sizable fluid cavities that can accommodate large solids in the product flow.

Top Lobe Plus pumps are optimised for energy efficienct operation and offer flushed double mechanical seals as an option to allow dry running.

A VERSATILE, HYGIENIC ROTARY LOBE PUMP WITH LOW SHEAR AND GENTLE PRODUCT HANDLING FOR BOTH HIGH AND LOW VISCOSITY PRODUCTS

DOUBLE DIAPHRAGM METERINGS PUMPS

THE IDEAL CHOICE FOR A QUICK AND AFFORDABLE FLOW CONTROL SOLUTION THAT DELIVERS ON QUALITY AND RELIABILITY

SPX Flow Technology Building 12Bii, Weaver Road Growthpoint Office Park, Tonetti Street Midrand, Johannesburg Joseph.Mokgwamme@spxflow.com

CAPE REGION Southern Pumps 48 Marconi Road, Montague Gardens (+27) 21 551 2490 Info@southernpumps.co.za

CEREX RANGE Their double diaphragm design, combined with built-in failure detection, delivers superior leak prevention performance compared to single diaphragm pumps with a similar price point.

In addition, the CEREX metering pumps are constructed from standard, proven components held in stock minimizing build time without compromising on quality.

KZN REGION The Pumpsmith Unit 12 Rossmead 14 Malone Road, Maxmead (+27) 31 701 1438 mark@thepumpsmith.co.za

www.spxflow.com

PUMPS

What you need to know about the Inlet Supply of your High Pressure Pump Unsuitable inlet supply can cause even the best designed pump to malfunction. As a result surprisingly serious problems can be caused by the simplest issues or go unnoticed by inexperienced machine operators. The most notable of which is pump cavitation.

Remember, there is no standard way to set-up a system because no two systems are the same. However by understanding cavitation and following some simple rules, you can prevent it.

What is Cavitation and how does it relate to Inlet Supply?

Water is supplied to the pump through the inlet valves.

When a high pressure pump is starved of water, it will suck in air and cause cavitation in the pump. You will know your pump is cavitating when it starts to vibrate and make a very loud knocking noise.

Bubbles of water that gets sucked into the system implode in the pump causing the vibration. In addition the alternating of heat caused by friction and lack of water, followed by bursts of cold water cause the ceramic pistons to shatter.

The back end of the pump is destroyed by cavitation. This includes the conrods, the plungers and the crankshaft.

Cavitation also causes seals to wear and the valve plugs to burst.

When the crankshaft seizes it causes the motor or engine to seize, destroying more than just the pump.

Cavitation destroys the pump and possibly even the motor or engine it is coupled to. Thereby making it an expensive and inconvenient experience which should be avoided at all costs.

off a pipe that also fed the washroom (i.e. the toilets and basins). When too many people flushed the toilets and/or used the basins simultaneously, the water supply to the high pressure washer was compromised causing insufficient inlet supply to the high pressure pump.

A header tank is an inexpensive yet effective way to protect your system from cavitation. When in doubt as to the standard of the water supply, use a header tank.

This is done by ensuring that the water supply to the pump is enough for the needs of the pump. Furthermore no air must be able to enter the water feed.

How to ensure the Inlet Supply is sufficient 1.Pumps with a flow rate of less than 15L/min A connection to a domestic tap may be used for pumps that have an output of less than 15L/min so long as the water supply is not shared. The water pressure must also be fairly consistent. The water supply can be provided through one inlet.

We had a client who operated a car wash at a garage. Shortly after he installed his high pressure washer, the pump got damaged due to cavitation. He asked us to investigate why.

It turned out that the tap that fed his pressure washer came 10

Pipes, Pumps and Valves Africa - Mar/Apr 2019

Cavitation causes the ceramic pistons to shatter.

2. Pumps with a flow rate of 15L/min or more We at Hawk, install header tanks onto high pressure systems that have a flow of 15L/min or more as a standard feature to protect the system. Header tanks must always be situation higher than the pump system to enable it to be gravity fed.

• Use the correct size piping The inlet piping to your pump must be sized to the pump volume. The plumbing diameter should be greater than the size of the port of the pump.

3. Pumps with large flow outputs

• Avoid restrictions Use as few restrictions as possible. This includes elbow, tees, reducers, etc. These restrictions cause an uneven flow which can introduce turbulence and air entrainment, which may result in vibration.

Pump systems with an output of about 150L/min or more must have a booster pump to facilitate the supply of water to the pump. Gravity will not be sufficient. When a booster pump is used, it is not necessary to feed the water through both inlet valves.

• Ensure no air enters the suction line Any joint in the inlet plumbing must be tightly sealed with Teflon tape or similar product to avoid air leaks and cavitation. There should be no kinks in the inlet hose or signs of damage.

Plumbing of water to the system and effect on Inlet Supply

To recap: If air is allowed to enter the pump, or the inlet feed water is restricted, the pump will cavitate. Most of the problems associated with positive displacement pumps are caused by water starvation or entrained air.

Water supply will be fed through inlets on both sides of the pump.

Follow these simple rules when pluming in water supply to your high pressure pump system: • Avoid friction loss The pump system should be situated as close to the water supply as possible, using the least length of piping. This reduces friction losses. Pipe friction is also reduced by using a larger diameter pipe thereby limiting linear velocity.

PUMPS

Broken pieces of metal from the back-end will burst through the housing.

The back-end of the pump is completely destroyed by cavitation.

Hawk High Pressure Pumps Tel: +27 (0)31 274-8555, sales@hawkpumps.co.za, www.hawkpumps.co.za

Pompetravaini, a market leader in the manufacture of Liquid Ring Vacuum Pumps – A&VT are the Sole Agents for Southern Africa.

SALES, SPARES AND REPAIRS

info@vactech.co.za

0861 VACTEC (822 832)

www.vactech.co.za

Pipes, Pumps and Valves Africa - Mar/Apr 2019

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PUMPS

The importance of maintaining your slurry pump Regular maintenance of your slurry pumps extends the wear life, helps avoid unplanned downtime and lowers the total ownership cost for end users. In the rigorous, demanding world of mining, slurry pumps are often run to breaking point before intervening. This may seem beneficial in the short-term, but in the long-term you could be doing your plant an injustice.

Monitoring the performance characteristics of the pump regularly keeps you informed of its operation, and provides ample time to take a measured response rather than incurring a failure and unplanned downtime.

From a preventative perspective, there are regular tasks to carry out during the campaign of the pump to ensure it runs for longer. If there is an unusual sound detected, leakage identified or a spike in temperature or vibration, this triggers the need for more in-depth maintenance during a planned shut-down before a failure occurs.

Vibration Every machine that runs vibrates: place your hand on your refrigerator at home and you’ll feel minor vibrations as the motor runs. With most machines, vibration is one of the earliest indicators of a machine’s health and is therefore an important measurement to monitor closely.

The vibration velocity target varies from pump to pump; the maximum value target for a large pump will be greater than a medium sized pump handling water. Conversely, 12

Pipes, Pumps and Valves Africa - Mar/Apr 2019

when we introduce solids into the fluid the vibration will increase in relation to the mixture properties and the duty parameters. When running routine inspections we always refer to historical data to understand the range of vibration acceptable for that particular pump in that particular application.

Vibration monitoring is about following a trend on a regular basis to understand if there has been a noticeable change.

Our technical customer facing team are familiar with the data and can tell you when the equipment is approaching the end of its life or if there’s an issue there that needs to be attended to urgently.

Once the pump reaches the end of its wear life it’s normal to experience an exponential growth curve in vibration readings, which will start to increase gradually. However, if our team notices a spike in vibration before the end of its service life, then we know something is wrong and requires further investigation. Generally, a spike in vibration is due to a wearing impeller or other wet end parts, which we can simply change out during a planned shutdown.

The bearing assembly is a critical component in any rotating equipment. In general, the bearing assembly service life is dependent upon the process and operation. When selecting a bearing assembly in relation to the hydraulic performance the L10 bearing life is taken into consideration. An increase in vibration and noise level is a clear indication that there may be an issue with the bearing assembly.

One of the main contributors to premature bearing failure is inadequate gland seal maintenance which can cause leakage, spraying slurry and water directly onto the bearing assembly. This can be minimised by regularly adjusting the seal and applying correct and consistent lubrication.

With our Warman® Accumin® lubricators, we remove personnel from the process. We can set up an automated system which consistently lubricates the bearing and sealing system to reduce the potential for slurry ingress and maximise the life of the bearing assembly. Read more about the best practice for lubrication here.

Throatbush and impeller adjustments Throatbush wear rate has a major impact on the overall efficiency of slurry pumps and in many applications has the shortest life compared to other components. Our team can spend an hour on each pump adjusting and fine tuning the throatbush to extend the life of the pump by up to 50%.

This allows for the other components to be fully worn out at the same rate before they are changed out, enabling the operator to derive the maximum value in terms of cost per tonne from the overall rebuild cost.

The importance of adjusting the throatbush to ensure the optimum gap between the impeller is vital. To help improve this process for operators, we developed automated rotating and axial adjustment technology, speeding up the process and increasing the accuracy of axial movement. Read more about throatbush and impeller adjustments here.

Defining the root cause It’s important to note that a drop in efficiency is not always an issue with the pump. We need to analyse the operating parameters and evaluate the application to identify the root cause. Our specialists are trained not only to look at the pump, but to also inspect upstream and downstream to understand if there is anything happening that may affect the pump’s operation.

There are a number of reasons for the premature failure of hydraulic components. A common issue that we experience in the field is incorrect materials being used for the application. There are a myriad of different material combinations that an operator can use and it’s important to use the OEM’s expertise in hydraulic design and material selection.

PUMPS

Bearing assembly

The Weir way Mine operators approach maintenance in different ways; some choose for their team to maintain the slurry pumps whilst others choose to use the service of the OEM to carry out all maintenance procedures.

We take a hands-on approach to maintenance, with our fitters and service engineers out in the field at least 50% of their time, helping customers inspect and rebuild their equipment. This regular contact with the customers and equipment on site ensures our team is in tune with maintenance best practices, reports any deficiencies and ensures the pump can adapt to meet customers’ performance requirements.

Our philosophy is preventative maintenance; regularly maintaining the pump to alert the customer ahead of time if there is an issue so that we can plan for it. Following a plant audit, we work with the customer to set up maintenance strategies that are bespoke and plant-dependent. We also offer a “fixed cost per tonne of throughput” model to reduce the historical cost per tonne for maintenance in the plant for slurry pumps. Utilising our expertise, prediction models and product development we help the customer save money and budget with confidence.

Another option is predictive maintenance, using Synertrex® our IIoT solution. This technology allows operators to closely monitor the health and performance of their pumps and triggers an alert when an issue occurs. When installed on a Warman® pump, Synertrex® can monitor the bearings and gland seal health, detect cavitation and other hydraulic anomalies, track efficiency and forecast wear life, allowing operators to make condition-based decisions.

Weir Minerals, Rajen Governder, Tel: +27 (0)11 617-0700, rajen.govender@mail.weir, www.global.weir Pipes, Pumps and Valves Africa - Mar/Apr 2019

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PUMPS

Multotec’s ceramic impellers to boost uptime at DRC mine

A large order of 24 ceramic impellers destined for pumping equipment in a copper mine in the Democratic Republic of Congo signals the value this technology brings through longer wear life and less plant downtime.

Designed and manufactured in South Africa by Multotec Wear Linings, part of the Multotec Group, the ceramic impellers can be a viable alternative to conventional pump impellers and in the right application are expected to last up to five times longer.

“The impellers will be used in slurry pumping applications where particle sizes are less than 6 mm in size,” says Mark Jarrett, business development manager at Multotec Wear Linings. “The ceramic solution is particularly effective in resisting abrasion, and also deals well with high levels of either acidity or alkalinity.”

The ceramic design, in which alumina ceramic components are bonded mechanically and chemically onto a stainless steel impeller skeleton, is growing in popularity. Multotec Wear Linings has been supplying ceramic impellers into the market place for many years and some 300 ceramic impellers have already been exported by Multotec Wear Linings into the African market during the past four years.

“The key advantage of our ceramic technology is to lengthen the replacement intervals for these wear parts,” says Jarrett.

“This, in turn, reduces downtime on the plant and raises productivity, invariably delivering positive impacts to the bottom line.”

To further enhance the ceramic value-add, Multotec also offers ceramic components on certain other strategic pump components.

“Our ceramic shaft sleeve, for instance, also contributes to longer life, and can be replaced easily without the risk of damaging the shaft,” he says. “We can also provide other components – such as the throat bush and the frame plate liner – with ceramic protection for better wear resistance and longer service life.”

Ceramic impellers are available in various standard sizes, but there is scope for the development of custom solutions to suit the customers’ needs. They have been successfully applied in mainly gold and copper operations, primarily in the tailings and leaching circuits, as well as other aggressive environments.

Jarrett highlights that all applications of ceramic solutions must first be thoroughly investigated before the best option is finalised.

“Our experienced Multotec technical professionals will conduct a detailed and methodical assessment of the

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

Designed and manufactured by Multotec Wear Linings, the ceramic impeller is a viable alternative to conventional pump impellers.

customer’s plant conditions before recommending the appropriate solution,” he says. “We consider the key characteristics of the plant process to confirm if the ceramic solution is the optimal one. This includes understanding the total wear conditions of the plant system.”

Multotec Wear Linings are leaders in local design and manufacture of ceramic pump components Vivienne Murray, Multotec Group, Tel:+27 (0)11 923-6000, marketing@multotec.com, www.multotec.com

Pump efficiencies improve with bushings and wear rings Several pump manufacturers have discovered that a combination of Vesconite Hilube bushings and wear rings can improve pump efficiencies even more than the introduction of either the bushings or the wear rings.

PUMPS

“One client introduced Vesconite Hilube bushings into their multi-stage pumps, but still had a stainless steel wear ring that needed bigger running clearances,” explains pump technical advisor Phillip de Villiers.

“The company has since switched to Vesconite Hilube wear rings, thereby reducing running clearances and improving efficiencies,” he says.

Efficiencies are improved if thermopolymer wear rings and bushings are used together and their running clearances are matched to each other. This results in reduced leakage as well as electricity savings.

In addition, metal-on-metal wear is eliminated since polymer components that touch the metal are worn away themselves rather than having the metal wear away or damaged.

“Every pump manufacturer is trying to achieve better efficiencies,” says De Villiers.

“This is why many are seriously considering Vesconite Hilube bushings or wear rings and, increasingly, both Vesconite

Vesconite Hilube bushings and wear rings for multi-stage pumps.

Hilube bushings and wear rings in their multi-stage pumps,” he concludes.

Phillip de Villiers, Vesconite, +27 11 616 1111 phillip@vesconite.com

Pipes, Pumps and Valves Africa - Mar/Apr 2019

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PUMPS

New laser cladding services for refurbishment of pumps and valves Thermaspray has recently purchased a laser cladding machine capable of successfully refurbishing worn or mis-machined components that traditionally could not be refurbished, particularly in the pipe, pump and valve-industries. Laser cladding is also used for the protection of critical surfaces of new components in these same industries.

Laser cladding, unlike laser welding, is a weld build-up process that applies a metallic overlay material, usually in powder form, to primarily metallic substrates using a laser as the heat source. Laser cladding is the ideal solution to protect components since the non-porous weld overlays are metallurgically-bonded to the component’s surface and are resistant to mechanical impact and capable of withstanding severely abrasive or corrosive wear environments.

Laser cladding is effective for component refurbishment because of the non-porous, metallurgically bonded overlays, the exceptionally low dilution between the overlay material and the component surface, as well as the low heat-input produced by the weld pool. This low heat-input and low dilution means that components can be refurbished to nearnet shape, with reduced requirement for post-machining, and application of less overlay material to the component in order to achieve the desired abrasive- and/or corrosivewear resistance.

The coatings applied to components by laser cladding range from tungsten carbides for extreme wear and slurry protection, to Stellites and stainless steels for dimensional repair and corrosion protection. Alloys specifically designed and manufactured for each environment and use can be applied to virtually any surface, on both new and worn components requiring refurbishment, with little to no risk

of component distortion.

Components used in the pipe, pump and valve industries are often exposed to harsh environments that result in wear or corrosion that can eventually result in component failure.

In the refurbishment of pump components such as pump shafts, plungers, sleeves and centrifuges, which are typically subject to abrasive-, adhesive- and/or corrosive-wear, tend to be sensitive to distortion when refurbishing. Components such as wear plates, impellers, suctions discs, wear rings, impeller rings and housings are also subjected to abrasiveand corrosive-wear.

Ball valves (both the ball and seats), valve housings and casings, stems and wafers are also often exposed to harsh environments in which abrasive-, adhesive- and corrosive-wear shorten the useful life of these components which results in early maintenance and often unplanned refurbishment costs. The cost of refurbishment of some of these components is often high, and maintenance of critical components can lead to costly downtime.

In the European, American and Australian markets, laser cladding has been used for many years as the preferred reliable and cost-effective solution for the refurbishment of expensive or distortion-sensitive components, as well as for the protection of new components.

A damaged hydraulic pump shaft.

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

A ball valve refurbished with laser cladding.

Thermaspray, a surface engineering solutions provider in Gauteng, is proud to introduce this technology to the pipe, pump and valve industries in South Africa. Our four-kilowatt fibre-coupled diode laser is housed in a booth specifically built for this purpose. The process is digitally controlled, and a six-axis robotic manipulator and horizontal manipulator ensures repeatability and process stability, for components regardless of shape or size.

Thermaspray offers its customers turnkey solutions that

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are tailored to their specific needs, on a job-specific basis.

Thermaspray also provides thermal spray, plasma transferred arc welding, and grinding, machining and polishing facilities to customers. As an ISO 9001 and ISO 3834 certified company, you can trust that your refurbishment and surface engineering needs will be met at the highest quality, by a team with extensive experience and know-how, in a facility that can process all your components from start to finish.

PUMPS

The laser cladding process.

Thermaspray, Tel: +27 (0) 11Â 316 6520/8/9, www.thermaspray.co.za

2019/02/19 11:42

Pipes, Pumps and Valves Africa - Mar/Apr 2019

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Back to basic: Mechanical Seals PUMPS

Pipes, Pumps & Valves Africa attended a workshop hosted by Liquid Movers and presented by Andreas Vandré, Flowserve Regional Manager Educational Service EMA, where mechanical seals came under the spotlight.

In a survey of the chemical and petrochemical industries the question was asked: What is the main reason that rotating equipment is removed from service for maintenance. An overwhelming 69% responded this was because of sealing devices, while bearings only accounted for 10%, static joints 9%, hydraulics 3%, coupling 2% and all other issues 7%.

Mechanical seal reliability, says Vandré, is of critical importance for centrifugal pump operations. “Wherever a rotating shaft moves fluid, mechanical seals play a role,” he explains.

Understanding the basic concepts, components and principles in mechanical seals can go a long way to improving reliability.

Reasons for failure Average seal life has increased significantly in recent years.

More so, a properly designed, selected and installed seal can deliver optimal service life. There are, however, a variety of reasons why a seal can fail, says Vandré.

“Some common operational causes that result in failure include when the pump is being operated too far from the best efficiency point (BEP), insufficient Net Positive Suction Head available (NPSH), operating dead-headed, improper venting or dry-running to name a few.”

These kinds of issues account for failure at least 40% of the time. It is estimated about 24% of mechanical seal failures are due to mechanical causes such as shaft alignment, coupling balance, pipe strain and pump condition while some 19% are attributed to system design causes such as the flush arrangement, insufficient cooling or dual seal auxiliaries.

According to Vandré seal components play a role as well with common causes including poor tribological pairing, the seal face material quality and/or secondary seals.

Available technologies There are several available technologies for mechanical seals such as gland packing, explains Vandré. “The pump is fitted with a gland follower that can adjust to achieve the desired leakage which must be present as no leakage provides no lubrication.”

There are several pros to glad packing including the inexpensive up-front costs, being easy to install and easy to adjust. “The cons are that it could possible require flush as well as continual, competent adjustment and atmospheric leakage,” he says.

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

Types of seals Mechanical seals are divided into two groups – cartridge and component type seals. Cartridge type seals are a requirement by the American Petroleum Industry, for example, for hydrocarbon applications. These seals are factory assembled and tested with measurement setting required.

“It is one piece to handle making installation errors less likely to occur,” explains Vandré. “Face damage is also far less likely and they are time saving. Also, these types of seals are easier to bench test.”

Component seals in contrast come in several pieces making it slightly more difficult to handle, with many part/material options that have to be manually set. “While these seals are often considered to be less expensive the possibility of assembly error is greater,” says Vandré. “Face damage is also more possible. These are the seals that we tend to still most

higher pressure than the primary seal, no leakage of process fluid is acceptable.

More detail A typical “pusher type” mechanical seal consists of a rotating face, a stationary face and secondary sealing elements with a drive mechanism and some type flexible elements, says Vandré.

Seals are usually classified into three categories, three types and three arrangements. Category 1 is used in non-ISO 13709/API 610 pump seal chambers with application where the seal temperatures range from 40 to 260 °C. Category 2 is used in seal chambers meeting the chamber envelope dimensional requirements of ISO 13709/API 610 while the seal temperatures range from 40 to 400 °C. Category 3 is for the most rigorously tested seal design.

The three different types of seals are type A – pusher seals; Type B – metal bellows seals and type C – metal bellows seals using high temperature gasket materials.

The three arrangements, says Vandré, are categorized from 1 to 3. Arrangement 1 are single seals where the process is not a safety or environmental concern and the emissions monitoring for this seal is not stringent. Arrangement 2 are dual seals using a buffer system. The second seal sees lower pressure than the primary seal. Some leakage of the process fluid is acceptable and can be managed. Arrangement 3 is a dual seal using a barrier system. While the second seal sees

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often see in older pump designs.”

According to Vandré seal arrangements 2 and 3 can be split into three orientations – face to back, face to face, and back to back.

Understanding heat The seal faces and seal assembly can generate heat in the seal chamber due to liquid shear in the sealed fluid between the seal faces, liquid turbulence in the seal chamber, mechanical motion in the seal assembly or even when occasionally bumping or touching of the seal faces.

According to Vandré seal generated heat must be removed in most applications to maintain stable operation. “In high temperature applications, the opposite may be true,” he says. “The heat in the seal chamber must then be maintained to provide a stable operation. To control the temperature in the seal chamber and to provide adequate lubrication for the seal faces, a seal flush is required for the vast majority of applications.”

Flowserve, Andreas Vandré, avandre@flowserve.com,www.flowserve.com.

Liquid Movers, Gary Denham, Tel: +27 (0)11 708-0600, gary@liquidmovers.co.za,www.liquidmovers.co.za

PRICE PUMPS, for Air Operated Double Diaphragm Pumps for harsh mining applications. A&VT are the SOLE Agents for Southern Africa.

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www.vactech.co.za

Pipes, Pumps and Valves Africa - Mar/Apr 2019

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Pumping systems training should be a requirement PUMPS

Having a workforce that fully understands the nuances and complexities of critical operating systems and equipment is central to ensuring plant safety and to optimize operating performance. Pipes, Pumps & Valves Africa attended a workshop hosted

by Liquid Movers and presented by Andreas Vandré, Flowserve Regional Manager Educational Service EMA, where education came under the spotlight.

When it comes to pumps there is really only one rule, says Vandré, and that is safety first.

That is why education plays such a central role. “When plant operators, reliability engineers, system engineers and maintenance personnel deepen their understanding of flow management systems, you are immediately looking at a safer operations environment,” explains Vandré.

He says while often times operating around a pump safely requires one to really only be aware of the surroundings and apply a bit of common sense, the importance of an educated workforce cannot be underestimated.

Considering the fact that a centrifugal pump was hardly a secret, the company took the decision to include its customers in its internal training sessions but this soon grew into what is now an external education service.

Vandré advocates that all staff are trained be it only the basics or customized and advanced.

“It has since become one of the most important aspects of our business. Not only do we offer customized training around the world where customers can choose location, course content, and program formats to optimize human and financial resources to help them deliver optimal results, but we also have six learning centres in various locations where companies can come for training,” says Vandré.

“There are a variety of courses available with training experts that can accommodate any request and tailor content to a company’s specific needs.”

These centres, all equipped with state-of-the-art facilities and laboratories, can facilitate up to 40 learners at any given time and allow for a very dynamic, hands-on experience.

According to Vandré Flowserve, one of the largest suppliers of industrial and environmental machinery in the world, recognised the importance of training within their own organisation.

“Learners can touch the pumps, operate them and immediately see the consequences of any giving action or operation of the pump. It is an incredibly powerful experience.”

“The company started a dedicated educational service to train internally in an effort to increase employees’

These centres are fitted with a range of typical as well as heavy duty pumps and requires students to get up close and

Through education companies are also far better equipped to fully leverage all of its resources, while taking advantage of the latest advancements in the industry.

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knowledge on the products. Not only was the theory of the products a focus but also the practical operations of the pumps and valves we were manufacturing were being trained on,” he said. “We started to see increased interested from our customers who wanted to join our internal training sessions.”

Pipes, Pumps and Valves Africa - Mar/Apr 2019

personal with the equipment.

Benefits of training Regardless if you are in the maintenance, operation, or supervision of pumping systems training should be a requirement, says Vandré.

Far too often only a handful of people on a plant are trained.

He says educating the workforce across the board – albeit at different levels – has far more advantage.

The benefits of training are also realised very quickly by companies that invest in the education of their staff. Not only is the operating environment usually safer, but it also increases productivity and decreases down time. More knowledgeable staff also often translates into more sales.

According to Vandré training and upskilling staff also impacts on the team work of staff. “It does not matter what the technical knowledge in an organisation is, ultimately the most important element for success is communication with others. An educated and trained staff are able to communicate well with each other. The better a team communicates, the better they work together and deliver results.”

PUMPS

Educating one’s workforce optimizes pump performance regardless of the industry.

Flowserve, Andreas Vandré, avandre@flowserve.com,www.flowserve.com.

Liquid Movers, Gary Denham, Tel: +27 (0)11 708-0600, gary@liquidmovers.co.za,www.liquidmovers.co.za

Pipes, Pumps and Valves Africa - Mar/Apr 2019

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Understanding centrifugal pumps PUMPS

Take the time and read the operating manual when purchasing a pump advises Andreas Vandré, Flowserve Regional Manager Educational Service EMA. More so, make sure the manual is available to staff in general and not just the pump operators.

Also, make a point of investing in training and upskilling staff to understand the inner workings of pumps. All of this will ultimately result in overall better performance.

In the pump business prevention is really better than cure.

Whilst not everyone in an organisation needs to have an in-depth understanding of how a pump operates, having at least some basic knowledge can make a major difference to pump operations and cost, says Vandré.

This was clearly demonstrated at a large international company recently where only four weeks after installation a pump failed. With no indication as to what had gone wrong the original equipment manufacturer was called in to sort out what was considered to be a factory flaw.

On arrival, the manufacturer found the seal was damaged and the pump did indeed need repair. Getting it back up and running a few days later, all guarantees were given that the pump was now in full working order. Yet, some four weeks later, the pump owner called again with another complaint of pump failure.

It was found that the pump had been installed correctly and the owner insisted all procedures and processes were being followed during operation. Yet, two more failures followed.

With costs now escalating for both the owner (downtime of the pump) and the manufacturer (the equipment was still under warranty), a full-scale investigation was launched as to why the temperature was rising in this pump resulting in

the seal being damaged every four to five weeks.

With the one party pulling its hair out and the other scratching its head, a decision was taken to send someone from the service department to physically observe the pump in operation.

An answer was soon forthcoming. A cleaner was unplugging the water supply and using the water pipe to wash the floor.

This changed the situation completely. It was no longer a manufacturing flaw and the pump owner became responsible for all the costs occurred.

However, it is not just the cost of the repairs to consider, but also all of the downtime especially if one considers that on average it takes about five days to do a medial repair on a pump.

“Too often manuals are not read,” says Vandré. Another challenge is that not everyone in the company necessarily understands how the pump works or even what the parts are and can unwittingly, like the example above cause major damage.

Companies like FlowServe also offer a variety of educational training ranging from very basic to extremely advanced courses. Liquid Movers recently hosted just such an

A workforce that understands the practical operations of pumps and valves makes for better operations.

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

introductory educational day for its clients where Vandré gave some critical insight into centrifugal pumps.

Covering the basics What is a centrifugal pump?

A centrifugal pump is a machine that uses rotation to impart velocity to a liquid and then converts that velocity into pressure energy. Flow is a consequence of the interaction between the pump curve and the system curve.

These pumps are used to move liquid from a lower elevation to a higher one or to move liquids from a lower pressure area to a higher one. Pumps are also used to move liquid long distances.

“Pumps more often than not do more thing than one thing at once for example having to move liquid from a lower pressure to a higher area over a very long distance,” explains Vandré.

Why do pumps fail?

There are three reasons why pumps fail. “The first is mechanical,” says Vandré. “This can be due to improper maintenance or even improper installation. It is therefore extremely important when installing a pump and servicing it to follow the exact instructions of the OEM following the guidelines as set out in the Installation Operating Manual.”

A second reason for failure is the operational environment.

“This could be due to improper start up or shut down, any off-design operations that are introduce or the lack of equipment health monitoring.”

The third reason for pump failure is system design and this could be poor piping design or the incorrect pump selection for the operation.He says people often have no idea what the pump is doing. Monitoring of every single pump in an operation is therefore essential.

Pump components At the most fundamental level, a centrifugal pump consists of just three components, says Vandré – an impeller, casing

and shaft assembly that consists of a shaft, bearings, sealing arrangement and some structural components.

The impeller

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Pumps are used across a wide variety of industries, says Vandré, from water supply to irrigation and sewage movement pumps are the most critical component for modern day living.Because of the variety of uses, they come in a plethora of sizes and shapes. There are three types of centrifugal pumps – overhung pumps, between bearing pumps and vertical pumps.

The impeller is the main rotating component of the pump used to speed up the liquid. Impeller designs are grouped as either radial flow, mixed flow or axial flow depending on their hydraulic geometry.

The casing The pump casing is the major stationary component of the pump with two major functions: it converts velocity head to pressure head and is the pressure boundary for the liquid pumped.

Shaft Assembly The shaft transmits rotational energy from the driver to all fixed rotating components. The sealing device controls leakage between the stationary and rotating components. It also controls leakage across process to atmospheric and the bearing housing to atmospheric boundaries. Bearings and bearing housing absorbs loads, maintaining rotor integrity and facilitates rotation.

Flowserve, Andreas Vandré, avandre@flowserve.com, www.flowserve.com.

Liquid Movers, Gary Denham, Tel: +27 (0)11 708-0600, gary@liquidmovers.co.za,www.liquidmovers.co.za

Pipes, Pumps and Valves Africa - Mar/Apr 2019

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Solid Handling Specialists With more than 50 years in manufacture of dry bulk materials handling equipment, AMDROTOLOK is proud to continue the supply of quality equipment to our many long standing and valued both local and international clients

Tel: +27 (0) 11 674-1166/7 Cell: +27 (0) 82 441-8658 Fax: +27 (0) 11 674-4372

Our partial product range includes: • • • • •

Rotary Valves Flap Valves Knife Gate Screw Conveyors Bucket Elevators, etc.

Repairs & reconditioning on all the above products including other brands

theo.sherman@amd-rotolok.co.za www.rotolok.co.za

Powerful pump questions

PUMPS

Eight powerful pump questions a successful engineer must ask.

You have purchased or are considering purchasing a pump.

Perhaps you are experiencing problems with the pumps and systems in your process. Whatever the case may be, you will find it worthwhile to take a few moments and read our tips.

place, you can focus on the pump itself for the requirements to accommodate the potential of the system. When a new system is being created, more possibilities can be incorporated.

1. What do i expect from this pump?

In the case of an existing pump, the first job is to inspect it – Are there any tell-tale signs of excessive or uneven wear?

Has there been cavitation? Does a diaphragm pump with a ruptured diaphragm have a worryingly low stroke count? If the pump is at fault due to unaccountable circumstances, then contact the manufacturer first. It is worth considering that the system and fluid conditions may be affecting the pump.

You can ask “What do I need from this pump?” or even “What did I ask for?”

Are you going to ask for the minimum specification that will perform the duties and meet compliance or is there any benefit in selecting a pump with a higher initial cost price that will by definition of ‘immediate need’ be overengineered?

So, are you expecting too much? Did you expect this low cost pump to run 24 hours a day, handle extreme applications, deliver a high discharge pressure or a flow rate being energy efficient? Were you expecting it to cope with high suction lifts and to last 10 years with little to no servicing?

From this point of view, planning out the process so that you accurately know what your pump should be doing, is crucial.

Of course in reality the requirements of a system and a fluid can change. If you are prepared to expect the unexpected, it may be wise to specify the worst case scenario your pump should be capable to handle. There are many small tweaks you can add to cope with these changes. It could even be considered to change your pump working principle to get a good process result.

On the other hand, can you have expected too little? Many entry level pumps can provide perfectly adequate operation.

But, if your process is critical for safety or continuity, then selecting a budget model may be a false economy.

2. What pump is right for my system?

If a pump needs to be chosen where a system is already in

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

At this point it is worth digging out the duties and assumptions that were specified originally to select the pump and possibly re-assess the current system’s operation.

Probably there have been adjustments to the suction or discharge duties such as the pipework and the fluid levels.

Also the position of the pump between ‘A’ and ‘B’ the pump is situated between, the pump speed or fluid type the pump is handling. Working through this information with your supplier should hopefully troubleshoot any problems.

There is a standard list available to check the basics of your pump.

Assuming the system is ok, it could be that the pump itself was either incorrect for the job or at least not the optimal choice.

Working example: The use of progressing cavity pumps to handle wet flowable pulp in paper recycling.

The pump had frequent changes of rotors and stators from abrasive wear. Also the mechanical seals are affected. An alternative may be a screw centrifugal pump which can provide effective pumping of viscous and fibrous pulps that

are ‘flowable’ and handle abrasive particles well. A screw centrifugal pump is ver y price competitive and can be adjusted 2-3 times to accommodate the increased tolerance due to any abrasive wear which will reduce the spares cost.

3. Are the conditions consistent at my site?

If your production process is subject to fluctuations, not only in basic parameters, but also in the system such as pipework and changes in configuration it is important to be aware of the impact this can have on the working efficiency of the pump a longer period of time.

Cumulative heating or cooling of the fluid from external pipework or machinery can cause degradation of the fluid and changes in the fluid state. For example, increased viscosity will affect the suction conditions. It can also affect the efficiency of a pump, particularly with centrifugal pumps.

The use of temperature controlled pipework and heating jackets may be used to provide a more stable temperature environment. In industrial applications such as annealing, sintering, crystal growing and brazing, high temperature heat pipes are often applied.

Working example: An internal rotary gear pump must pause during the pumping process of melted chocolate due to a fault elsewhere.

The chocolate must be maintained at a temperature sufficient to keep it in a liquid state to ensure a safe start-up and maintain the quality and consistency of the batch.

An example of a thixotropic fluid may be a slurry of macerated cereal such as maize which is used to create biofuel.

This slurry is circulated to increase the surface area and exposure to microbes. If the circulation process stalls at any point, the liquid, which has a thin mud consistency in flow, will go to a thick sludge when kept static and becomes very difficult to pump.

Should unplanned downtime happen mid-process, will the fluid set? An exampleof this could be grouting mixes which harden quickly. A downtime of even minutes may mean a long time to clear the pump and restart it. In some cases it may be worse: a new pump is needed!

If this is a problem in your process, it may be important to consider the use of duty standby pumps and to make an inventory of critical spares needed for your process*. If this does not solve the issue, the pumping principle should be investigated: does this pumping principle fit to my fluid and process data?

Other factors such as the pump losing priming, running dry and the start-up procedure are also critical factors to consider when choosing a pump.

5. What happens if contaminations or a foreign body gets into the pump?

4. What happens when the fluid stops?

Examples of contamination such as solids above a certain diameter or elements which cause changes in the chemical composition of a fluid, can cause gradual, and sometimes even catastrophic failure.

In the event of process downtime, either planned or unplanned where fluid remains in the pump, what happens to it? And, perhaps even more crucially, what happens when the pump is started up again? Of course, the fluid type is important here – a suspension, a thixotropic fluid or a fluid that may set, will damage a pump ver y quickly when fluid remains.

Contamination in the line, because water entered the pump, may cause dangerous reactions. To mention a few: sulphuric acid and hydrogen gas. Corrosion, caused by oxidation of thermal oils, can pollute and damage not only the pump, but also pipework and vessels. If the wetted parts of the pump are not resistant to the oxidized thermal oils, even a risk of explosion can occur.

The liquid to be pumped is therefore also very important when choosing a particular pump principle.

If a foreign body enters the pump flow, this could be fatal, especially if it is of sufficient hardness and size to affect mechanical working parts.

One example of this is the use of certain types of metering pumps handling lime in wastewater treatment. As the pump

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If a process requires a consistent temperature to maintain a desired fluid state, then it is important to be aware of various points in the system and the impact this will have on the fluid.

stops, the lime will begin to settle, causing a build-up and eventually causing a blockage. A peristaltic pump will ‘break up’ the lime coating on the hoses’ internal diameter and easily pump any fluid that mayhave settled due to its open flow path and pumping principle.

An example of this may be found in waste food processing.

Pipes, Pumps and Valves Africa - Mar/Apr 2019

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Many of the pumps installed in these facilities are specified for handling of the macerated food slurr y itself, based on viscous material containing small particles. In case a ver y large diameter solid or a high percentage of hard, abrasive solids (such as ground egg shells) enter the flow, this can cause accelerated wear or cause an immediate failure.

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Sometimes a fluid flow consists of several liquids that have differences in viscosity, solids content, temperature and/ or density. It is important to select a pump based on the highest values that can occur. What are the maximum solids content that we have to deal with? What temperature fluctuations are there in this fluid flow? Whatis the highest density that can occur?

A common example may be replacing a rotary lobe or progressing cavity pump with a screw centrifugal or peristaltic pump which can handle both abrasive, viscous and unexpected large fibred solids, thanks to an open channel flow path.

When large solids contents and viscosity and density fluctuations can be expected, a screw centrifugal pump would be a safe choice. For example: Slaughterhouse waste, consisting of large bones, will pass a screw centrifugal pump without any problem.

6. How much will this pump cost me in the long run?

There are many factors to consider in the assessment on cost. For which process is the pump used for? Is the pump running 24/7, or just a few hours a day? Are you looking for a long-term solution, or is a short-term solution sometimes a better alternative from a budgetar y point of view?

Especially important to consider cost for long-term solutions are: • The purchase cost of the pump and installation cost • The operating cost in terms of energy, accessories and consumables • The expected lifespan of the pump • The cost of labour for maintenance and failure of the pump, clean-up costs • Cost of inefficiencies such as inaccurate dosing, or ruined production batches • Efficiency loss because of aging of the system • Potential resale value or cost of disposal There are many variables within these 7 main costs and several combinations to be made, to help assess what is the ‘best’ value for the customer in terms of operation and financial means.

Perhaps a better question would be “How can I explain the layout of my production process and its bottle-necks in a way that i will have the right pump at the right place?”

Some pump suppliers offer site surveys to obtain a better picture of the customer’s day to day operation and will help assess the factors above.

Together with your pump supplier the total cost of ownership over the life of the pump can be calculated. This is based on the experience with these pumps in similar process conditions.

7.Can I use the same pump for another fluid?

In many cases ‘yes’, however in reality this only counts for 28

Pipes, Pumps and Valves Africa - Mar/Apr 2019

the same fluid ‘type’. There are obvious examples in which two drastically different fluids will not be compatible with the same pump; for example a closed vane centrifugal pump handling solvent and then abrasive sludge with long fibres.

If the fluids are similar in many of the physical properties such as viscosity, S.G., vapour pressure, solids content and temperature, then it may well be possible to use one pump to pump both fluids. Another restriction is that the flow delivery and discharge from the pump do not exceed the maximum available data in the pump. The pump must also be chemically compatible, especially with strong acids and bases.

A good example of this is the use of an all-PTFE AODD pump at a chemical plant for a pilot process.

The pump will be required to handle multiple chemicals, mostly water consistency and at ambient temperature. The AODD may be more effective than a centrifugal pump, as the S.G. may change significantly and the fluid is delivered in an IBC, which may cause the pump to run dr y towards the end of the transfer.

An AODD pump is in principle a suitable pump to pump multiple fluids with.

In general, a positive displacement pump is much more robust in handling multiple fluids. PD pumps can pump high and low viscosity fluids, PD pumps are self- priming, can run dry, and can handle abrasive particles.

A centrifugal pump is mostly defined to pump one fluid only. The pump data are specified for the fluid. To avoid cavitation or vibration it could be necessary tore-assess the NPSH values and the pump curves.

If you wish to pump multiple fluids- with one pump, you ought to consult a pump specialist.

8. What are the characteristics of my fluid?

The character and properties of a fluid will clearly determine the pumping principle with many factors being considered: • Corrosive • Abrasive • Volatile • Toxic • S.G. • Viscosity • Vapour pressure • Thixotropic • Solids concentration • Solids size • Solids hardness • Shear sensitive • Extreme temperature Each of the above parameters must be considered in order to select the best pumping principle. Each of the above parameters must be considered in order to select the best pumping principle.

Verder Pumps, Tel: +27 (11) 704 7500 Email: info@verder.co.za Web: www.verderliquids.com/za/en/

Mine Track & Tools serves as the single most influential valve company to the mines that mine the Great Gold Reef running through the Witwatersrand Basin.

CONTACT

Vincent Mulder +27 79 517-4489 vincent@minetrack.co.za

info@minetrack.co.za +27 11 412-4536 www.minetrack.co.za

bauma report back Record bauma attracts more than 620,000 visitors from over 200 countries, bauma 2019, the world’s leading trade fair for construction machinery, building material machines, mining machines, construction vehicles and construction equipment, generated the best results in the exhibition’s 65-year history.

The number of visitors rose by about 40,000 over the total produced during the previous event in 2016. More than 250,000 visitors came from countries outside Germany. The top 10 visitor countries after Germany were: Austria, Italy, Switzerland, France, the Netherlands, Russia, Sweden, the Czech Republic, Poland and Great Britain.

The trade fair also experienced a strong increase in attendance from overseas visitors. Significant gains in this group were produced by China, Australia and Japan. More than 5,500 visitors came from China alone. The number of exhibitors totaled about 3,700 from 63 countries – likewise a record. With its unprecedented 614,000 square meters of space, the largest bauma ever held was once again a bauma filled with records.

THE RIGHT CHOICE FOR ADVICE & SUPPLY IN ALL APPLICATIONS OF FLUID CONTROL

IRRIGATION

PIPES & FITTINGS

PUMPS & VALVES

FLUID CONTROL DIVISION BRANCHES: ALRODE, BLOEMFONTEIN, BOOYSENS, BOKSBURG, BRITS, CAPE TOWN, DURBAN, EDENVALE, GEORGE, PORT ELIZABETH, KIMBERLEY, KLERKSDORP, MAFIKENG, NELSPRUIT, POLOKWANE, PRETORIA, ROBERTVILLE, SPRINGS, VEREENIGING, VAAL, WADEVILLE, WITBANK, WYNBERG

Customer care: 0860 10 27 99 www.stewartsandlloyds.co.za

BAUMA REPORT BACK

Wide range of robust fluid handling technology solutions A wide range of robust fluid handling technology solutions was showcased by Watson-Marlow Fluid Technology Group (WMFTG) at Bauma 2019.

Of particular note this year is the company’s response to growth in the tunnel boring machinery (TBM) market.

TBMs require the most reliable components available; each element must be proven to deliver under arduous conditions.

The high cost and time-constraint challenges faced by engineers on TBM construction projects present very particular challenges. Once excavation has started, any breakdown can result in costly downtime and in-situ repairs can be difficult. What’s more, delays at the tunnelling stage can impact on the completion of the project and may result in financial penalties.

With this mind, the company’s Bredel range of heavy-duty peristaltic hose pumps is the ideal choice. Abrasion resistant hoses can double pump uptime and save energy.

Typical applications for the robust Bredel hose pumps include Earth Pressure Balance (EPB) and slurry-shield TBM fluid pumping; backfilling grout; and single and two-liquid grouting. In addition, Bredel pumps – specified for wet spray pumping to hydraulically or pneumatically apply liquid cement accelerator to the surface of the excavated tunnel.

Solutions for chemical metering WMFTG manufactures a range of pumps for the accurate metering of the vast range of chemicals used in the mining industry; precision in this area helps to cut chemical costs.

Product ranges on show at Bauma include the multi-awardwinning Qdos family of peristaltic metering pumps – capable of delivering accurate, linear and repeatable flows across all process conditions from 0.1 to 2000 ml/min at up to 7bar.

At the other end of the scale, Bredel hose pumps – which offer with flow rates up to 108m3/h - are noted for their ability to deliver a high degree of flexibility for chemical metering in mining applications. Because the hose is the only part of the pump to come into contact with the chemical, mine engineers are able to significantly lower maintenance requirements and increase the pump’s reliability and lifespan. Ultimately, this lowers the total cost of ownership.

Typical metering applications include the handling of shear sensitive polymers, flocculants, reagents and abrasive lime slurries for pH control or corrosive chemicals.

The paper aims to inform the mining industry of the primary advantages linked to the use of peristaltic hose pumps for high density, abrasive paste transfer at precious metal mines. For competing pump types there is a high degree of difficulty in handling abrasive paste and chemicals, with up to 80% solids, over long distances and without frequent breakdowns. The paper successfully argues that WMFTG’s Bredel pumps offer more efficient operation and faster processing time than alternative technologies as well as greater safety.

Solutions for precious metal mining

Watson Marlow Bredel, Tel: +27 (0)11 796-2960, info.za@wmftg.com, www.watson-marlow.com/za-en

Finally, WMFTG will use Bauma as a launch-pad to present its latest white paper entitled a Study of peristaltic hose 32

pump technology in precious metal mining: Maximising profits, minimising costs.

Pipes, Pumps and Valves Africa - Mar/Apr 2019

Japanese pump manufacturer Tsurumi, presented two new pumps, for the first time, at the Bauma 2019 in Munich, Germany. With its innovations KTZ415 and KTZ615, the Japanese company has outdone its series of professional drainage pumps for difficult applications.

The 615 is the new top model of the KTZ series that now comprises 15 models. Thanks to a motor output of 15 kW, the aggregate achieves up to 2800 l/min with discharge heads of almost 40 metres. In contrast, the 415 with the same motor ‘only’ pumps 2000 litres but up to a maximum height of 55 metres.

“We have launched this high-performance duo that complements itself;” says product manager Stefan Himmelsbach.

Both submersible pumps can cope with sandy water, groundwater and rainwater. The water may also contain stones with grain diameters of up to 12 mm.

The pumps are pressure-resistant to a submersion depth of 25 m and have a pressure port with a diameter of four (model 415) and/or six (mode 65) inches on the outside thread.

The KTZ series was launched back in the 1980s and is one of the best-selling pumps in the product line. Even the smallest model with a motor output of just 1.5 kW can move 430 l/ min up to a height of 21.5 m. Obviously the manufacturer can deliver precisely what the target group requires with the KTZ.

BAUMA REPORT BACK

Tsurumi launched new submersible pumps at bauma 2019

The highlights of the series also include the dry runningsafe design (motor cooling and oil lubrication), the high wear-resistance (abrasive pumping media) and the failsafe feature (electrics). The KTZ is built in Tsurumi’s mega factory in Kyoto that is the world’s largest production site of its kind. This manufacturer supplies a total of 44 series for direct sale via 250 dealers in Germany alone. Many pumps can be leased.

Tsurumi displayed many other pump models for structural and civil engineering projects in Hall A6, as well as another innovative that it still under wraps but which will be launched in 2019.

Engineering enthusiasts could also look forward to exhibits of cutaway pump models and live wet applications.

Tsurumi’s European central office in Düsseldorf will also be celebrating its 35th anniversary during this time: this will also be addressed.

Tsurumi Pumps Africa, Jayson Lehmann, Tel: +27 (0) 11 876-5005, jayson@tsurumipumps.co.za, www.tsurumipumps.co.za Pipes, Pumps and Valves Africa - Mar/Apr 2019

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BAUMA REPORT BACK

Xylem at bauma 2019: New solutions At Bauma 2019 Xylem showcased its most resilient and innovative pumping solutions yet. Xylem also hosted a networking event to highlight women’s advancement in the construction and water industries.

Xylem’s new and improved products on display at Bauma, enabled customers to dig deeper and build bigger. Xylem’s powerful portfolio of tough dewatering and flood protection pumps redefines toughness for the mining and construction industries.

from reaching critical building systems and interior spaces.

The Godwin FP series is the only set of portable dewatering pumps to earn the seal of approval from FM Global, the largest private insurer of commercial and industrial properties worldwide.

Smart dewatering pump from Godwin’s Smart Series

Upgrades to Xylem’s Flygt 2201 series

New additions include the latest smart dewatering pump from Godwin’s Smart Series. The new Godwin Dri-Prime pump has been specifically designed to combat the toughest mining and construction applications, offering improved efficiency, increased flexibility and greater sustainability.

Xylem also showcased upgrades to its Flygt 2201 series.

The unique, patented DuraSpin hydraulic of the Flygt 2201 has been proven to be three times more wear-resistant than traditional hydraulic designs, leading to improved serviceability and reduced maintenance costs.

The pump can also be equipped with a new generation of Xylem Field Smart Technology (FST). This is Xylem’s first-inindustry, cloud-based telematics platform. It enables the Internet of Things and allows Xylem’s customers to monitor and control the pump from anywhere in the world.

Xylem will also reveal its latest addition to the series, the Flygt Super High Head Cast Iron 2201, which has the capacity to pump up to 140 meters.

Flood Protection (FP) Dri-Prime series Under its Godwin brand, Xylem also highlighted its Flood Protection (FP) Dri-Prime series, the first set of high flow, portable pumps certified to handle flooding, the world’s toughest dewatering challenge.

The Godwin FP Dri-Prime series is specifically designed to remove destructive floodwaters and prevent flood water 34

Pipes, Pumps and Valves Africa - Mar/Apr 2019

Xylem’s women networking event at Bauma Xylem also hosted a networking event for women to highlight women’s advancement in the construction and water industries.

The event is part of Xylem’s initiative #XylemsWomensNetwork, which was launched around the world last year. The initiative’s purpose is to anchor equal opportunities regardless of sex and to promote women’s advancement.

2018

CAMINEX

Copperbelt • Agricultural • Mining Industrial • Networking • Enterprise

ZAMBIA’S PREMIER coPPERBElt MInIng, AgRIcultuRAl And InduStRIAl tRAdE ExPo

Eveline Haagen, Xylem Business Development Manager, spoke at the event. She has been with Xylem Austria for more than 25 years and is an expert within municipal water technology as well as the drainage of construction projects.

“I want young women to become excited about the future of water,” she says. “It’s a great industry. If you have a basic technical understanding and find the water cycle interesting, you are right for Xylem. It doesn’t matter if you’re a man or a woman.”

4-6 JUNE 2019 Kitwe Showgrounds, Zambia 9am – 5pm Daily

ViSit uS

Bianca Monzer also spoke. She is currently completing a master’s in mechanical engineering and management at the Technical University of Munich. She is also part of Femtec, a network for women working within engineering and natural sciences.

How do our new product launches at Bauma help Redefine Tough?

Tough is Smart - Remote monitoring and control with our new generation Field Smart Technology enables our customers to remotely inspect the condition of the equipment, to know if a pump requires maintenance, to anticipate and solve issues, and to track and trace equipment with ease across multiple locations.

rEGiStEr oNLiNE FOR FREE ENTRY

Tough is Sustainable - Longer lasting Flygt 2201 - series that is 3X more wear resistant resistance and more environmentally friendly like the Stage 5 compliant Diesel engines in the New Godwin Smart Series with 90% reduction in particulate emissions Tough is Flexible -Ingenious versatility with our New Godwin Smart Series to switch impellers and handle both stringy material and hard solids up to 75mm in size Tough is On -Demand-We don’t just rent products. We solve problems. A wide range of dewatering, pumping and treatment solutions with engineered and turnkey project capabilities Xylem, Tel: +27 (0)11 966-9300, Lorraine.Smart@xyleminc.com, www.xylem.com

For more information about the show, contact: Zambia

South africa

Karen O’Neil | CACSS

Lebogang Motswaledi

+260 212 238011/12 karen.oneil@cacss.co.zm

+27 (0)11 835 1565 lebogang@specialised.com

www.caminex.co.zm Organised by:

Large irrigation schemes Dorot Valves used at a project in Ethiopia that will establish a large water-supply infrastructure from a dam on the Zariema River to one of the largest sugar-cane irrigation and sugar-production schemes.

VALVES

484,000 tons of sugar and 41,654 cubic meters of ethanol a year will be reached at its maximum production capacity.

The total land area for the project’s sugarcane cultivation is 50,000 hectares with a system supplied by Netafim and designed by BARAN Group, Israel.

The system includes: The construction of two pumping stations which draws water from the river and discharges into 4 reservoirs totalling 250,000 cubic meters in volume. The pumping stations include a total of 14 (8+6) vertical pumps for a total flow of 22,000 cubic meters per hour.

An additional 6 pumping stations include 30 vertical pumps, pumping water from the reservoirs to the irrigated area through 600mm – 1,500mm GRP piping. The total length of the main lines is roughly 60 kilometres.

Dorot is proud to be the main supplier of hydraulic control solutions to the Wolkaiyt Project that will, directly and indirectly, supply some 600,000 jobs to the citizens of Ethiopia.

The Challenge DOROT was required to provide hydraulic control and protection devices for the pumping stations and pipelines for the project. The protection was required to attenuate and prevent cases of water-hammer and damage to the pipe system due to risky sub-atmospheric pressures. In addition to the aforementioned, it was required that efficient operation was enabled to discharge accumulated air in the piping system.

The system was analyzed, using high-end computerized surge analysis and vacuum/air valve design tools. The suggested solutions have been designed based on the analyses’ results and included various sized: • Pump Control Valves • Surge Anticipating Valves • Pressure Sustain/Relief Valves • Vacuum/Air Valves The Solution Dorot Pump Control Valves, Model 30-BC, were installed on each pump discharge. The ‘BC’ valve will minimize pump start and stop surges by slowly opening at pump startup and slowly closing prior to pump shutdown.

Dorot Surge Anticipating Valves, Model 30-RE, were assembled on a T-junction to the pump discharge header.

These valves attenuate and relieve water-hammer caused by sudden pump shutdown (power failure). The valve instantly opens when the pump stops, relieving the returning highpressure surge and then slowly closes once the pressure returns to static level. The valve also functions as a pressure36

Pipes, Pumps and Valves Africa - Mar/Apr 2019

sustaining/relief valve.

DOROT pressure-sustaining/relief valves regulate the system’s pressure when the demand is low. The valve maintains a steady, predetermined pressure in the system by relieving access pressure back to the pump intake.

DOROT Vacuum/Air Valves, model DAV-M-KA, were installed along the main lines and at the pump stations. The air valves allow the discharge of accumulated air from a filling or already pressurized pipeline and prevent pipe-collapse and cavitation risks due to sub-atmospheric pressure conditions that may occur when the pipeline is being drained by allowing the intake of atmospheric air into the system.

Some of these air valves are fitted with a surge-arresting device (‘SA’) that limits the rate of air discharge during the system filling stage, thus assisting in creating an ‘air cushion’ that prevents float-slamming and water hammer.

Results The project is under construction and is expected to be commissioned in the second half of 2019.

Dorot Management Control Valves Ltd, info@dorot.com, www.dorot.com

“A Partnership that Works”

+27 (0)11 869 7859 +27 (0)72 185 1492

pcpump.tank@telkomsa.net www.pumpandtank.co.za

• Civils • Pumps • Tanks (A/G - U/G) • Pipe work • Pressure testing • Electrical • Vasconic Testing • Tank De-gasing & Cleaning

VALVES

ENERGYValves supplies turnkey valve solutions under the EMVAfrica banner ENERGYValves plays a pivotal role as one of three powerful brands within EMVAfrica and has earned a stellar reputation as a leading supplier of premium quality stainless steel special alloy, valves and supporting services.

Born out of the consolidation of three associated companies, Energy Engineered Products, Multi Alloys and E-Metals Cape, EMVAfrica leveraged the strengths and three decades of experience of these founding companies.

The ENERGYValves division was established primarily to complement the process materials offering and is joined by the ENERGYMetals division and associated company, Multi Alloys, under the EMVAfrica brand.

“As part of the dynamic EMVAfrica group, ENERGYValves

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

is positioned as more than a supplier of valves, we offer complete solutions,” states Graham Whitty, Director of EMVAfrica. “Our valves are well-accepted across a wide spectrum of applications in the mineral processing, water treatment, petro-chemical, power generation, food and beverage and general industrial sectors. We remain committed to providing only the finest quality products coupled with unrivalled service excellence to our customers irrespective of the application.”

gate, butterfly, check, needle, and pressure relief valves.

“In addition to stainless steel, ENERGYValves also supplies valves in lower steel grades such as carbon steels,” notes Whitty. He adds that the division also holds extensive stock of the most commonly used valves in corrosion resisting alloys.

“ENERGYValves is passionate about providing premium solutions which affirm our reputation as a leading stainless steel special alloy and valves specialist. We strive to be our customers’ preferred partner to assist them in enhancing their businesses’ productivity and profitability levels,” concludes Whitty.

VALVES

ENERGYValves complements its extensive valve range with a valve actuation service. The division has a fully equipped workshop stocked with a range of pneumatic double-acting and spring return actuators. Together with a comprehensive service offering including valve repairs and servicing, technical advice and free delivery within Gauteng and Cape Town, ENERGYValves has seen solid growth over the past few years. The dedicated projects team has thorough experience in supplying full valve solutions for turnkey projects and their extensive technical expertise in special alloys provides an in-depth understanding of the products’ performance in corrosive and challenging industrial environments.

ENERGYValves, Tel: +27 (0)11 466-2480, www.emvafrica.co.za

“ENERGYValves is ISO9001: 2015 certified and therefore we place quality as our most important principle in both our products and services,” says Whitty. ENERGYValves’ range of stainless steel valves is sourced from reputable and highly certified manufacturers and suppliers with proven track records. The division is focused on establishing longterm relationships with suppliers and regularly audits their quality standards as well as provides material and pressure test certificates with all valve products.

With stainless steel forming the bulk of the valves range, the division also offers valves in Duplex stainless steel, titanium, 904L, zirconium, nickel alloys as well as numerous other high performance alloys. The company’s comprehensive valves portfolio includes a range of ball, knife gate, wedge

The one-stop-shop for all your pump refurbishment needs.

Thermaspray provides wear, corrosion and abrasion resistant coating services on new and refurbished pump components such as shafts, sleeves, centrifuges, impellers, diffusers, wear rings, bearing brackets etc.

Thermaspray’s services include laser cladding, thermal spray, plasma transferred arc welding, grinding, machining and polishing, all provided in line with our ISO 9001 and ISO 3834 certifications.

T: +27 11 316 6520 F: +27 11 316 7527

T: +27 21 959 8217 F: +27 86 767 2374

E: info@thermaspray.co.za

E: info@surcotec.co.za

W: www.thermaspray.co.za

W: www.surcotec.co.za

Pipes, Pumps and Valves Africa - Mar/Apr 2019

39

Basics of industrial valves There are many different types of valves, each one responding to a specific function in a process.

Among these functions, two primary functions can be distinguished : on-off or control. Auxiliary functions such as draining and sampling, injecting and rinsing are all applications of “on-off” or control valves.

VALVES

On-off valve The function of an on-off valve is to either stop or allow the flow of fluid in a pipe. An on-off valve functions like a switch: either on or off, all or nothing.

Control A control valve is a device where variations in the position of the obturator result in a change to the flow path of the fluid,therefore modifying the pressure or flow rate at the outlet. The design of the obturator is different than that of the on-off valve. Generally in the shape of a disc or plug, the obturator is profiled so that a law or characteristic can be established between the flow rate at the outlet and the percentage of opening of the valve.

On-off valve

Many different control characteristics exist, of which there are two principal ones : 1. Linear characteristic : The flow rate evolves linearly in function of the percentage opening of the valve. For example, to obtain 60% of maximum flow, the valve needs to be opened at 60% of the total stroke.

2. Equal Percentage Characteristic : Here, the characteristic curve is exponential. For instance for 40% maximum flow rate at full opening, the valve must open at 80% of its total stroke.

Draining & Withdrawal Drain valves are generally installed at the bottom of a tank or reactor. In order to drain or withdraw a fluid from a container, an on-off or control device can be used depending on what is required in the process. To drain a tank, an onoff valve is perfectly adapted. On the other hand, to withdraw fluid from a process, the use of a control function may be required.

Distinctive Features • Disc flush with or protruding inside the tank when closed • Disc or Piston valve (see “Technology” chapter) • Crust breaking function: rising disc to break eventual deposits situated at the bottom of the tank • Opening inside the tank or into the valve body (disc valve) • Limited dead space thanks to a profiled plug (piston valve) Sampling A sample can be taken from the heart of a process with the use of a sampling valve. This function is not subject to control, the objective is simply to take a sample whenever required (an on-off function).

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

Drain valve at the bottom of a tank

Distinctive Features • Flush closing or protruding obturator • Piston valve, disc valve or ball valve (see “Technology” chapter) • Crust breaking function: obturator protrudes into the fluid line to break up eventual build-up of solid particles (applicable for piston or disc valves) • Possibility of a sampling pot to collect sample • Generally fully polished to prevent adhesion of product during flow • Can be sterilized for pharmaceutical applications • Reduced dead space to avoid contamination between two samplings • Can have fixed quantity for sampling (i.e. 150 mL) • Possibility to install an isolation valve for the sample and a nozzle to add a pressure release valve Injection An injection valve allows the injection of new components to a fluid moving through a pipeline or stored in a tank. The

injection of a fluid can be done by means of an on-off valve or by a control valve if the procedure imposes a specific injection characteristic Distinctive Features

Injection

VALVES

Sampling

and closing of valves in an installation is frequent • Some valves all positions are spring loaded for mounting in allositions

• Piston or disc valve (see “Technology” chapter) • Injection valves can be used as “killer” product injectors to stop a reaction in progress • A specific study can be conducted to optimize the mixture of fluids Spraying, rinsing and cleaning Spray valves, whether rinsing or cleaning, are generally equipped with a spray head that optimizes the stream or dispersion of fluid being sprayed for efficient rinsing. These applications do not require a control function and are therefore managed with “all or nothing”, on-off valves.

Example of a swing check valve

Distinctive Features • Valves installed on a tank • Cleaning of the tank with an adjustable, concentrated jet • Upon opening, the spray head (which is part of the obturator) extends into the tank to allow the rinsing fluid to go through • Injection of the rinsing liquid from the center of the spray head • Slits in the spray head can have different forms, therefore generating a fluid stream perfectly adapted to the shape and size of the tank to be cleaned.

• Possibility to have a rotating head Non-Return The function of non-return valves is to block the fluid from flowing in the reverse direction. The function of control does not come into account with this type of apparatus.

Distinctive Features • Non-return valve, swing or ball type • A fundamental element of security • Eliminates the “Fluid Hammer” effect (pressure surge) • Must be installed where the opening

Safety Safety valves are installed to protect an installation from overpressures and therefore prevent the explosion of pressure equipment. Safety valves are automatic valves designed to open and automatically evacuate the fluid when the pressure reaches a predefined limit.

Distinctive Features • Protect equipment, instrumentation and piping from excessively high pressure • This function can be ensured with different designs : spring loaded safety valve, piloted relief valve, rupture disc or pin …(see “Technology” chapter) • This device is not active during normal operation of the process • Some piping accessories are limited to a one-time use (rupture disc or rupture pin) and must undergo maintenance if the safety device is triggered Valco Group, Tel: +27 (0) 21 556-1805, info@valcogroup.co.za, www.valcogroup.co.za Pipes, Pumps and Valves Africa - Mar/Apr 2019

41

INDUSTRY NEWS

Conference to address IIOT at PVP expo A delegation of local and international engineering professionals together with an unbeatable line-up of thought-leaders in Africa’s extractive-, construction-, energy-, food processing-, agriculture-, water & waste water- and power generation industries will be at the Pumps, Valves & Pipes Africa 2019 expo and conference in Johannesburg from 11-13 June to address latest technologies and proactive approaches to challenges in the operation and maintenance of pumps, valves and pipes.

The growing demand by processing- and manufacturing plants for Industrial Internet of Things (IIoT) solutions is testament to how important it is not to stay behind in this day and age. Connecting industrial assets like pumps, valves and pipes to the Internet and wireless technologies is a strategic enabler for improved manufacturing performance.

When properly implemented, it can provide appropriate security and availability of services across multiple plants and facilities.

Says Programme Manager, Nico Loretz: “It is against this background that INDUTEC will be hosting the 11th edition of Pumps, Valves & Pipes Africa. For the first time ever, the event is set to be boosted by sharing the stage with two chief construction events: African Construction Expo and Totally Concrete Expo - ensuring a broader audience mix and larger platform for the involved industries to network and do business.”

The free-to-attend workshops and conference sessions will look at standards and compliance; selection criteria; energy- and cost saving solutions; reconditioning; as well as

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Pipes, Pumps and Valves Africa - Mar/Apr 2019

the efficient operation and maintenance of pumps, valves, pipes, tanks, vessels and drums.

The high-level joint keynote plenary session will look at how the PVP industry could leverage off fast growing economies and be best positioned to meet Africa’s construction boom needs. Localisation and skills for industrial development and engineering as well as strategic sourcing and supply of industrial assets for the conveyance of liquids, gases & slurries will also be addressed.

“The Advisory Board for the programme includes representatives from PetroSA, SAPREF, Eskom, AngloGold Ashanti, Rand Water and Astral Foods and the South African Irrigation Institute (SABI) – ensuring a most relevant and current programme designed by the industry for the industry”, concludes Loretz.

Sean Osterloh, dmg events, Tel: +27 (0) 11 783-7250 seanosterloh@dmgevents.com, www.pumpsvalvesandpipesafrica.com

The country’s leading mining, industrial and power generation expo takes place from the 10-12 September together with the recently launched A-OSH Expo Botswana.

This will be an all-encompassing event showcasing the latest technologies, machinery, products and solutions related to mining, industrial and power generation, as well as all things associated with occupational health and safety.

As a forum for trading, networking, learning and product sourcing, the co-located events will provide an excellent opportunity for local and international exhibitors, industry associations, government officials and industry professionals to connect over three days at one venue.

In addition to new products and live demonstrations, a full programme of free-to-attend seminars will also take place alongside the events. “The seminars will provide an excellent learning opportunity for exhibitors and visitors at the show,” explains Hefer. “Speakers will be addressing a variety of topics pertinent to both industries, and will add value with their knowledge and expertise.”

A segment of the seminar series will be aimed at equipping women with the practical knowledge needed to aid their work within the respective industries. It will include motivational and life journey testimonials from established leading women in the industries concerned.

“With its local and international participants and leading brands on show, Electra Mining Botswana and A-OSH Botswana Expo will be of benefit to exhibitors who want to expand their footprint in Botswana and also to visitors who want to source the latest products and services, and to learn about new technologies and solutions,” says Hefer.

“But the benefits extend beyond the exhibitors and visitors,” explains Hefer. “The positive impact of these events in

INDUSTRY NEWS

Electra Mining Botswana recognised as essential industry trade platform

Visitors at Electra Mining Botswana in 2017

Botswana is that they will be contributing in the region of 8-million Pula to the national economy, either directly or indirectly.

This is through venue expenses, expenditure on products and services, advertising and promotion, logistics, travel, accommodation, meals and drinks, the spend of exhibitors on exhibiting, and the additional local spend of visitors and exhibitors whilst at the trade show.

The exhibition also contributes to part-time job creation during the show and add-on tourism for those visiting Botswana.”

Electra Mining Botswana is endorsed by the Botswana Chamber of Mines, the Botswana Institution of Engineers (BIE), and the South African Capital Equipment Export Council (SACEEC).

Robuschi Roots blowers / exhausters are some of the finest in the world – Made in Italy.

info@vactech.co.za 0861 VACTEC (822 832) www.vactech.co.za

Pipes, Pumps and Valves Africa - Mar/Apr 2019

43

PUMPS AIR OPERATED DOUBLE DIAPHRAGM PUMPS

SAM Engineering KSB (Pty) Ltd

Cyclone Industries

T: +27 (0) 11 876-5600 F: +27 (0) 11 822-2013 E: info-za@ksb.com W: www.ksb.com

T: +27 (0) 11 823-4250 F: +27 (0) 11 823-4943 E: sales@sameng.co.za W: www.sameng.co.za METERING PUMPS

T: +27 (0) 11 821 5900 F: +27 (0) 11 825 7707 E: reception@cyclonesa.co.za W: www.cyclonepumps.co.za

T: +27 (0) 11 873-8620 F: +27 (0) 11 825-1401 E: wme@mweb.co.za W: www.versaflo.co.za

T: +27 (0) 11 826-6111 F: +27 (0) 11 826-6162 E: sales@uniqueeng.co.za W: www.uniqueeng.co.za SLURRY PUMPS

Unique Engineering Walter Meano Engineering VersaFlo VSE Pumps

Unique Engineering

T: +27 (0) 11 826 6111 F: +27 (0) 11 826 6162 E: sales@uniqueeng.co.za W: www.uniqueeng.co.za DEWATERING PUMPS

APE Pumps T: +27 (0) 11 824-4810 F: +27 (0) 11 824-2770 E: apepumps@mweb.co.za W: www.apepumps.co.za MULTISTAGE PUMPS

C.R.I Pumps S.A. (Pty) Ltd T: +27 (0) 11 805-8631 F: +27 (0) 11 805-8630 E: cri@cripumps.co.za W: www.cripumps.co.za

BOREHOLE PUMPS

Atlas Copco Ernest Electro Engineering T: +27 (0) 11 792 9550 E: eeeaman@mweb.co.za W: www.ernestee.co.za

T: +27 (0) 11 821 9000 E: wendyb@za.atlascopco.com W: www.atlascopco.co.za END SUCTION PUMPS

Franklin Electric T: +27 (0) 11 723-6500 E: info@franklin-electric.co.za W: www.franklin-electric.com PLUNGER PUMPS

FLSmidth Krebs T: +27 (0) 10 210-4750 E: willie.vanwyk@flsmidth.com W: www.flsmidth.com SUBMERSIBLE PUMPS

SAM Engineering Franklin Electric T: +27 (0) 11 723-6500 E: info@franklin-electric.co.za W: www.franklin-electric.com

T: +27 (0) 11 823-4250 F: +27 (0) 11 823-4943 E: sales@sameng.co.za W: www.sameng.co.za HIGH PRESSURE PUMPS

Hawk High Pressure Pumps T: +27 (0) 031 274-8555 +27 (0) 10 010-0144 F: +27 (0) 31 205-4332 +27 (0) 11 822-2868 E: sales@hawkpumps.co.za W: www.hawkpumps.co.za

Franklin Electric T: +27 (0) 11 723-6500 E: info@franklin-electric.co.za W: www.franklin-electric.com

PISTON PUMPS

Unique Engineering T: +27 (0) 11 826 6111 F: +27 (0) 11 826 6162 E: sales@uniqueeng.co.za W: www.uniqueeng.co.za CENTRIFUGAL PUMPS

T: +27 (0) 031 274-8555 +27 (0) 10 010-0144 F: +27 (0) 31 205-4332 +27 (0) 11 822-2868 E: sales@hawkpumps.co.za W: www.hawkpumps.co.za HORIZONTAL SPLIT CASE PUMPS

Ernest Electro Engineering

T: +27 (0) 031 274-8555 +27 (0) 10 010-0144 F: +27 (0) 31 205-4332 +27 (0) 11 822-2868 E: sales@hawkpumps.co.za W: www.hawkpumps.co.za

T: +27 (0) 11 876-5600 F: +27 (0) 11 822-2013 E: info-za@ksb.com W: www.ksb.com

Stewarts & Lloyds (Pty) Ltd T: +27 (0) 11 917-0778 F: +27 (0) 11 917-0769 E: peterk@sltrading.co.za W: www.stewartsandlloyds.co.za

KSB (Pty) Ltd T: +27 (0) 11 876-5600 F: +27 (0) 11 822-2013 E: info-za@ksb.com W: www.ksb.com

T: +27 (0) 11 792 9550 E: eeeaman@mweb.co.za W: www.ernestee.co.z 44

Hawk High Pressure Pumps

POSITIVE DISPLACEMENT PUMPS

Atlas Copco T: +27 (0) 11 821 9000 E: wendyb@za.atlascopco.com W: www.atlascopco.co.za

KSB (Pty) Ltd

Hawk High Pressure Pumps

Pipes, Pumps and Valves Africa - Mar/Apr 2019

Cyclone Industries T: +27 (0) 11 821 5900 F: +27 (0) 11 825 7707 E: reception@cyclonesa.co.za W: www.cyclonepumps.co.za

Walter Meano Engineering VersaFlo VSE Pumps T: +27 (0) 11 873-8620 F: +27 (0) 11 825-1401 E: wme@mweb.co.za W: www.versaflo.co.za

VALVES

PUMPS TRASH PUMPS

VERTICAL SPINDLE PUMPS

BALL VALVES

Tectra Automation C.R.I Pumps S.A. (Pty) Ltd T: +27 (0) 11 805-8631 F: +27 (0) 11 805-8630 E: cri@cripumps.co.za W: www.cripumps.co.za

VACUUM PUMPS

Air & Vacuum Technologies T: +27 (0) 861 822-832) +27 (0) 11 318 3241/2/3/4/5 F: +27 (0) 86 522-9188 E: burnm@vactech.co.za W: www.vactech.co.za

Walter Meano Engineering VersaFlo VSE Pumps T: +27 (0) 11 873-8620 F: +27 (0) 11 825-1401 E: wme@mweb.co.za W: www.versaflo.co.za VERTICAL TURBINE PUMPS

Mine Track & Tools (Pty) Ltd T: +27 (0) 11 412 4536/1665 E: info@minetrack.co.za W: www.minetrack.co.za

WASTEWATER PUMPS

T: +27 (0) 11 453-7537 F: +27 (0) 11 453-6056 E: valconsa@iafrica.com Web: www.valcon.co.za

Pleix-Quip T: +27 (0) 11 736 4994 F: +27 (0) 11 736 6130 E: tiaans@pleixquip.co.za Web: www.pleixquip.co.za BUTTERFLY VALVES

Atlas Copco T: +27 (0) 11 821 9000 E: wendyb@za.atlascopco.com W: www.atlascopco.co.za VERTICAL SUMP PUMPS

KSB (Pty) Ltd T: +27 (0) 11 876-5600 F: +27 (0) 11 822-2013 E: info-za@ksb.com W: www.ksb.com

SAM Engineering T: +27 (0) 11 823-4250 F: +27 (0) 11 823-4943 E: sales@sameng.co.za W: www.sameng.co.za

CHECK VALVES

Valcon Valve & Controls

APE Pumps T: +27 (0) 11 824-4810 F: +27 (0) 11 824-2770 E: apepumps@mweb.co.za W: www.apepumps.co.za

T: +27 (0) 11 971-9400 F: +27 (0) 11 971-9440 E: malan.bosman@tectra.co.za W: www.hytecgroup.co.za

Invincible Valves (Pty) Ltd T: +27 (0) 11 822-1777 F: +27 (0) 11 822-3666 E: enquiries@invalve.co.za W: www.invalve.co.za

Pleix-Quip T: +27 (0) 11 736 4994 F: +27 (0) 11 736 6130 E: tiaans@pleixquip.co.za Web: www.pleixquip.co.za CONTROL VALVES

KSB (Pty) Ltd T: +27 (0) 11 876-5600 F: +27 (0) 11 822-2013 E: info-za@ksb.com W: www.ksb.com WELL PUMPS

Ainsworth Valves T: +27 (0) 11 433-3968/79 F: +27 (0) 11 433-9107 E: ruben@uvc.co.za W: www.ainsworth-valves.co.za

T: +27 (0) 11 838-4028 C: +27 (0) 82 823-7703 E: thanesh.padayachee@macsteel.co.za W: www.macsteel.co.za

VAG-Valves South Africa Klamflex Pipe Couplings

C.R.I Pumps S.A. (Pty) Ltd T: +27 (0) 11 805-8631 F: +27 (0) 11 805-8630 E: cri@cripumps.co.za W: www.cripumps.co.za

KAYTAR Valves

KSB (Pty) Ltd

Pleix-Quip

T: +27 (0) 11 876-5600 F: +27 (0) 11 822-2013 E: info-za@ksb.com W: www.ksb.com

Macsteel

T: +27 (0) 21 987 8292 C: +27 (0) 81 555 5288 E: clinton@kaytarvalves.co.za Web: www.kaytarvalves.co.za

T: +27 (0) 11 736 4994 F: +27 (0) 11 736 6130 E: tiaans@pleixquip.co.za Web: www.pleixquip.co.za

T: +27 (0) 11 762-5326 F: +27 (0) 11 762-5674 E: o.galazka@vag-group.com W: www.vag-group.com DIAPHRAGM VALVES

Ainsworth Valves T: +27 (0) 11 433-3968/79 F: +27 (0) 11 433-9107 E: ruben@uvc.co.za W: www.ainsworth-valves.co.za

Pipes, Pumps and Valves Africa - Mar/Apr 2019 45

VALVES SLEEVE VALVES

Mine Track & Tools (Pty) Ltd T: +27 (0) 11 412 4536/1665 E: info@minetrack.co.za W: www.minetrack.co.za

Mine Track & Tools (Pty) Ltd T: +27 (0) 11 412 4536/1665 E: info@minetrack.co.za W: www.minetrack.co.za PINCH VALVES

Valcon Valve & Controls Invincible Valves (Pty) Ltd T: +27 (0) 11 822-1777 F: +27 (0) 11 822-3666 E: enquiries@invalve.co.za W: www.invalve.co.za

T: +27 (0) 16 976-1787/8/9 E: info@everyseal.com W: www.everyseal.com

Invincible Valves (Pty) Ltd T: +27 (0) 11 822-1777 F: +27 (0) 11 822-3666 E: enquiries@invalve.co.za W: www.invalve.co.za REPAIR VALVES

Ainsworth Valves Everyseal T: +27 (0) 16 976-1787/8/9 E: info@everyseal.com W: www.everyseal.com KNIFE GATE VALVES

Everyseal

ACTUATORS

T: +27 (0) 11 838-4028 C: +27 (0) 82 823-7703 E: thanesh.padayachee@macsteel.co.za W: www.macsteel.co.za PIPES

Rotork

T: +27 (0) 11 821 5900 F: +27 (0) 11 825 7707 E: reception@cyclonesa.co.za W: www.cyclonepumps.co.za

T: +27 (0) 11 805-8631 F: +27 (0) 11 805-8630 E: cri@cripumps.co.za W: www.cripumps.co.za

T: +27 (0) 11 433-3968/79 F: +27 (0) 11 433-9107 E: ruben@uvc.co.za W: www.ainsworth-valves.co.za

Everyseal T: +27 (0) 16 976-1787/8/9 E: info@everyseal.com W: www.everyseal.com SAVETY & RELIEF VALVES

T: +27 (0) 16 976-1787/8/9 E: info@everyseal.com W: www.everyseal.com

T: +27 (0) 11 453-9741 F: +27 (0) 11 453-9894 E: reshmita.singh@rotork.com Web: www.rotork.com HYDRAULIC TOOLS

Kiloton T: +27 (0) 861 707-707 F: +27 (0) 861 707-706 E: sales@kiloton.co.za W: www.kiloton.co.za W: www.onlinetoolshop.kiloton.co.za MANUAL

Tectra Automation T: +27 (0) 11 971-9400 F: +27 (0) 11 971-9440 E: malan.bosman@tectra.co.za W: www.hytecgroup.co.za MECHANICAL PACKING

Macsteel

Invincible Valves (Pty) Ltd

T: +27 (0) 11 838-4028 C: +27 (0) 82 823-7703 E: thanesh.padayachee@macsteel.co.za W: www.macsteel.co.za

T: +27 (0) 11 822-1777 F: +27 (0) 11 822-3666 E: enquiries@invalve.co.za W: www.invalve.co.za 46

Ts & Cs

Macsteel Everyseal

C.R.I Pumps S.A. (Pty) Ltd

T: +27 (0) 11 433-3968/79 F: +27 (0) 11 433-9107 E: ruben@uvc.co.za W: www.ainsworth-valves.co.za

T: +27 (0) 11 453-7537 F: +27 (0) 11 453-6056 E: valconsa@iafrica.com Web: www.valcon.co.za PLUG VALVES

GATE VALVES

Cyclone Industries

Ainsworth Valves

Pipes, Pumps and Valves Africa - Mar/Apr 2019

Agrico T: +27 (0) 21 950 4111 F: +27 (0) 21 950 4208 E: alfred.andrag@agrico.co.za W: www.agrico.co.za HOSES

CHICK HENDERSON

Chick Henderson T: +27 (0) 11 640-1400 F: +27 (0) 624-1432 E: rob@chickhenderson.co.za W: www.chickhenderson.co.za FOUNDRIES

KEW Foundries T: +27 (0) 53 841-0474 F: +27 (0) 53 841-0473 E: info@kewfoundries.co.za W: www.kewfoundries.co.za

KLINGER South Africa T: +27 (0) 11 842-8300 F: +27 (0) 11 827-8663 E: gareth.langton@klinger.co.za W: www.klinger.co.za

Viking Foundry (Pty) Ltd

Directors: W. Fourie (Chairman), N.P. Mnxasana (Non Exec) R Kruger, R. Dye, G.M. Scrutton Branch Manager: R. Dye Company Secretaries: Winhold Limited Reg No 1945/0196

T: +27 (0) 11 873-5093 F: +27 (0) 11 873-5695 E: sales@vfdy.co.za W: www.vikingfdy.co.za

11th

2019

11 - 13 JUNE 2019

Gallagher Convention Centre, Johannesburg, South Africa

ThE largEsT aNd mosT comprEhENsivE africaN TradE show dEdicaTEd To ThE iNdUsTriEs iNvolvEd iN ThE coNvEyaNcE of liqUids, gasEs & slUrriEs

ExpaNd yoUr bUsiNEss iN africa

gENEraTE frEsh lEads

fiNd NEw roUTEs To markET

fiNd oUT aboUT NEw proJEcTs

mEET NEw parTNErs

compaNiEs sUpplyiNg ThE followiNg iNdUsTriEs will ExhibiT: Mining * Construction & Consulting * Water & Waste Water * Petrochemicals * Chemicals Power Generation * Food & Beverage * Agriculture * Pulp & Paper

gUarENTEE yoUr sTaNd locaTioN Contact Dale Magaya to book your stand: dalemagaya@dmgevents.com +27 11 783 7250 Media and association partners:

www.pumpsvalvesandpipesafrica.com

Co-located with:

Organised by:

48

Pipes, Pumps and Valves Africa - Mar/Apr 2019