S MECHANICAL A ENGINEER Oct 2013
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Publication of the SA Institution of Mechanical Engineering, Incorporating News of Associate Organisations
BRIDGING THE GAP BETWEEN GRADUATION AND THE WORKPLACE
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JOINTLESS STRUCTURAL STEEL PARTS: A FIRST FOR SOUTH AFRICA
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Excellent Minerals Solutions
WARMAN® Centrifugal Slurry Pumps ENVIROTECH® Centrifugal Slurry Pumps ISOGATE® Slurry Valves Lower your operational costs with the Weir Minerals Solution In slurry and dewatering pumping, processing and control applications where the cost of ownership often outweighs capital cost as a priority, we help our customers address such issues as longevity, capacity, efficiency of operation and maintenance. Warman® slurry and Envirotech® dewatering pumps are among the world’s most comprehensive range of pumps for use in mining, chemical and industrial applications. These pumps are designed for ultra heavy duty applications such as mill discharge, process plant and tailings, high pressure pipelines, as well as other speciality applications.
Expertise where it counts
Robust design and rugged heavy-duty construction, the Isogate® slurry knife gate valve is designed for long life and high reliability. The Isogate® valve range now also includes Autoball™ 3 way check valves, swing check valves, and a diverse range of mechanical and pneumatic pinch valves. Copyright ©2012, Weir Minerals Africa (Pty) Ltd. All rights reserved. WARMAN is a registered trademark of Weir Minerals Australia Ltd and Weir Group African IP Ltd; ISOGATE is a registered trademark of Weir do Brasil Ltda; AUTOBALL is a trademark of Weir Minerals Australia Ltd.
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For more information contact us on: +27 (0)11 9292600 www.weirminerals.com
October 2013
Chris Reay
Chairman of the Working Committee: Communications (SA Institution of Mechanical Engineering)
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1THREAD_4169_SAM
Minimise downtime maximise output
You know your business and how to get your goods out the door, but keeping your training up to date is vital if you want to stay ahead. Drive Academy provides continual training courses on the products in the SEW-EURODRIVE stable. We provide training on operation, maintenance, repairs, start-up, troubleshooting, project planning and condition monitoring. We also offer customised training and demo units for training purposes. Call Drive Academy today and make sure you minimise downtime and maximise output. SEW-EURODRIVE - Driving the world.
Tel: +27 11 248-7294 Web: www.sew.co.za Info: elouw@sew.co.za
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The monthly circulation is 3 947
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Vaughan Rimbault CEO SAIMechE
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Stephen Murefu (SAIMechE Central Branch Chairman); Lynne Smedley-Williams (SAIMechE); and Carel Kruger (SAIMechE Central Branch Vice Chairman)
Kamil Balsanek (Autodesk); Richard Smedley-Williams (WorldsView Technologies); Naji Attalah - Guest Speaker (Autodesk Manufacturing - Middle-East & Africa) and Daneel Ballaram (WorldsView Technologies).
Kudzai Nyangoni (SAIMechE President); Kamil Balsanek (Autodesk); and Naji Attalah - Guest Speaker (Autodesk Manufacturing - Middle-East & Africa).
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Genuine Hansen parts & regular maintenance by skilled technicians will ensure sustainable operation, maximised uptime & plant availability so that you benefit from high productivity and lower overall cost of ownership & return on investment. Stephan Britz, with our competent after-sales team, is on standby 24/7 to give you class leading, unsurpassed back up, field service, maintenance & repair. e e Mov
s on th
Alway
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Nickel Chrome Molybdenum steel helical gears are cut to a 25째 pressure angle to maximise shock load sustainability
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Falk V-Class gear drives fit perfectly into BMG’s portfolio
Optional Duraplate totally self contained cooling system for the most extreme conditions
The housing has an identical top and bottom, making the unit fully invertible
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Do you own a Tablet computer?
What do you think of Electrical Engineers?
If you could change one thing in South Africa, what would it be?
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Academic
Projects
Willem Sullivan
Career Path
Commentary
Achievements
BEETHOVEN’S CAREER SHOULD HAVE ENDED WHEN HE BECAME DEAF. HE DISAGREED. Some of the world’s most treasured music wouldn’t exist had Beethoven not kept working after he became deaf. Every professional should have that choice, which is why PPS offers disability cover that pays in full, after an accident or illness, even if you decide to continue some degree of work. Become a PPS member and you can also have your share in PPS profits through the PPS Profit-Share Account. .co.za. For more information SMS ‘SE’ and your name to 42097. Alternatively consult a PPS accredited financial advisor or visit www.pps.co.za. PPS offers unique financial solutions to select graduate professionals with a 4-year degree. PPS is an authorised Financial Services Provider. Members with qualifying products share in the profits of PPS. Terms and conditions apply. Standard SMS rates apply.
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4-way flexing action absorbs all types of shock, vibration and misalignment Torsional
Sure-Flex coupling sleeves have an exceptional ability to absorb torsional shock and dampen torsional vibrations.
Angular
The unique design of the Sure-Flex coupling’s teeth allows for the absorption of angular misalignment without wear.
Parallel
The lateral flexibility of the coupling sleeve minimises radial bearing loads normally associated with parallel misalignment.
Axial
Sure-Flex couplings may be used in applications with limited axial shaft movements.
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Our strength is that we match the pump to the specific requirements precisely such that, for example, the energy consumption is minimised and the operating costs reduced
Dr Norbert Kastrup
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And by increasing the rigidity, the pump casings can now absorb higher forces and imparted by the pipelines
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Gary Els
Lightweight, high strength, low reactivity and corrosion resistance of PVC
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Helena de Villiers, the branch manager at Premier’s West Rand branch
Roelf Frauendorf, sales manager of Premier Valves
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In conjunction with the mining engineer, we’ll build a single leg or a dual leg pressure station which is usually mounted on a skid as a complete unit which can be moved around
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POWER
GENERATION
T O D A Y
PROMECH PUBLISHING Tel: (011) 781-1401 Fax: (011) 781-1403 Email: samecheng@promech.co.za Website: www.promech.co.za Managing Editor: Susan Custers Editorial: Kowie Hamman Advertising: Mark Bennett Circulation: Catherine Macdiva DTP:
Zinobia Docrat/ Jacquelene Nene
Disclaimer PROMECH Publishing does not take responsibility for the opinions expressed by individuals.
Copyright
Cletus Makombe of Cummins South Africa
TICKER TAPE
All rights reserved. No editorial matter published in “Power Generation Today� may be reproduced in any form or language without written permission of the publishers. While every effort is made to ensure accurate reproduction, the editor, authors, publishers and their employees or agents shall not be responsible or in any way liable for any errors, omissions or inaccuracies in the publication, whether arising from negligence or otherwise or for any consequences arising therefrom. The inclusion or exclusion of any product does not mean that the publisher or editorial board advocates or rejects its use either generally or in any particular field or fields.
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Joan MacNaughton
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Here’s a big reason you can save even more energy. Etanorm is a classic that keeps getting more efficient. It meets the energy efficiency requirements of the ErP Directive for 2015 already today – for three good reasons: optimised hydraulic components for pace-setting efficiency, individual impeller trimming, and ideally matching drives and automation components. Etanorm is available really fast, comes in numerous variations, and provides the unique reliability of a globally identical product. For more information, please visit www.etanorm.com / www.ksbpumps.co.za
Pumps Valves Service ■
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Picture taken from space by NASA in 2009 of the Mildred Lake Mine Site
Standing next to the two Hippo Submersible Slurry Pumps are Marius Sunkel and Riaan Zowitsky who were part of the manufacturing team
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Mike Myers
Table 1: Classification of EPS products (EN 13163) Type
Compressive stress at 10 % deformation kPa
Bending strength kPa
EPS S
–
50
EPS 30
30
50
EPS 50
50
75
EPS 60
60
100
EPS 70
70
115
EPS 80
80
125
EPS 90
90
135
EPS 100 100
150
EPS120
120
170
EPS 150 150
200
EPS 200 200
250
EPS 250 250
350
EPS 300 300
450
EPS 350 350
525
EPS 400 400
600
EPS 500 500
750
Table 2: Classification of load bearing EPS products with acoustical properties Type
Compressibility
Dynamic stiffness
EPS T Level taken from Level taken from Table 10 Table 12 in EN in EN 13163:2008 13163:2008 EPS Type
EN 13163
[Unit]
EPS SD
EPS HD
EPS EHD
Thermal Conductivity
EN ISO 8301
W/(m.k)
0.038
0.035
0.032
Compressive stress 10%
EN 826
CS(10),[kPa]
60
100
200
Bending strength
EN 12089
BS,[kPa]
100
150
250
Dimensional stability
EN 1603
DS (N) %
0.5
0.5
0.5
d,[ kg/m³ ]
13.5
18
27
Minimum density
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OVERVIEW OF EXAMPLES OF APPLICATIONS AND EPS PRODUCT TYPES Application versus EPS Type EPS SD EPS EPS HD EPS 60/100 100/150 CELLARS Internal Insulation External, protected GROUND FLOORS Slab-on-ground Concrete floor On construction floor FLOORS Loft Insulation Floating floors WALLS/GABLES Cavity wall insulation SIPS/Others Sandwich panels - steel External insulation ETICS PITCHED ROOFS Internal insulation (all) Sandwich panels (all) External insulation FLAT ROOFS Warm roofs Cool roofs Inverted roofs CIVIL ENGINEERING APPLICATION All/general LEGEND • normally used = not possible from functional requirements - not necessary/applied normally unless properties are explicitly needed 1) when load distribution boards are applied 2) when load bearing
EPS EHD EPS 150/200
• =
•
-
• • •
• • •
• -
• •
•
-
• • • • •
• •
-
• • •
• 2)
• 2)
• 1) • =
• =
• •
•
•
•
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BENDING AND FABRICATION S ! LIMITATIONS LIFTED H NEW S A FL COUNTRY WIDE!
REDUCE FABRICATION COSTS AND IMPROVE ENGINEERING DESIGN BY UTILISING OUR NEW 12 METRE X 2 000 TON PRESS BRAKE We bend mild steels up to 25mm over 12 000mm We bend Q & T steels up to 22mm over 12 000mm We bend stainless steels up to 20mm over 12 000mm
WE CAN BEND MUCH THICKER OVER SHORTER LENGTHS. Please call to enquire.
• We also cut (Laser, Plasma, Flame) up to13 000mm long & 3 000mm wide • We now roll up to 50mm over 3 000mm (much thicker over shorter lengths) • We carry a comprehensive range of stock in ferrous and non-ferrous metals • Contact our sales team to discuss your individual requirements • Please visit our website for full details • Trade buyers are welcome
PEOPLE WORTH KNOWING
• We deliver
CONTACT US +27 11 062 3200 • www.generalprofiling.co.za • sales@generalprofiling.co.za 36
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Precision Press’s first group of trainees learn the finer arts of engineering measuring, from left: Andile Mapapu, Nkosiyazi Bomela, Rowende Baartman, Tandile Zotwa, learning and development manager Raynier Deysel, Zkhona Sangotsha, Vuyiseka Mgema and subject-matter expert PJ August
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www.promech.co.za * Easy navigation through the site * Comprehensive archive
* Free to users * No registration * Searchability
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Conference & Exhibition 17–19 March 2014 Cape Town International Convention Centre Cape Town, Republic of South Africa Co-located with:
www.powergenafrica.com www.distributechafrica.com
EQUIPPING AFRICA’S ENERGY FUTURE INVITATION TO PARTICIPATE
POWER-GEN Africa combines with DistribuTECH Africa for the first time to provide an extensive coverage of the power needs, resources, and issues facing the electricity and water generation, transmission and distribution industries across sub-Saharan Africa. Together POWER-GEN Africa and DistribuTECH Africa will bring together world leading power and water equipment suppliers, operators and developers from government utilities, commercial, manufacturing and consulting sectors as well as officials and ministers tasked with energy policy in this dynamic region of the world. The three day event will feature multi-track conference sessions and an extensive combined exhibition featuring the leading suppliers from both the International and African power sectors.
Owned and Produced by:
Utility Sponsors:
Leon Stone Exhibition Sales Rest of the World Phone: +44 (0) 1992 656 671 Email: leons@pennwell.com Andrew Evans Exhibition Sales Africa Phone: +27 (0) 21 9309515 Email: andrewe@pennwell.com Tom Marler Exhibition Sales Renewables & Hydropower Phone: +44 (0)192 656 808 Fax: +44 (0)192 656 700 Email: tomm@pennwell.com
REGISTER TO ATTEND NOW AT
www.powergenafrica.com www.distributechafrica.com
Presented by:
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Supported by:
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20/09/2013 09:18
MARKET FORUM
The completed 76 000 Am 3/hour reverse pulse bag filter at PPC’s Slurry cement plant’s Finishing Mill 4
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MARKET FORUM
WEiird
Fasteners
DIN 890 wing - hex slotted - socket torx - Philips - screw
DIN 891 magnetic screw head for fast simulation of screw joints
DIN 892 magnetic screw head for fast simulation of screw joints even from behind
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MARKET FORUM
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MARKET FORUM
Johannes Mlambo, supervisor medium weave department at FLSmidth, monitoring production of Tubular screen.
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MARKET FORUM
Lefadi Makibinyan
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Alex Ackron
Brenton Kemp
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David Cruz
October 2013
Ian Nicholls
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SAMHYDRAULIK, which is one of the leaders in the field of hydraulic transmission, has been operating for over 25 years in the international market, offering a complete range of orbital hydraulic motors and power steering units, axial pumps and motors for medium and high pressure ranges, all characterised by excellent performances. SAMHYDRAULIK employs 120 people who operate inside a very modern and efficient plant that spans over 6 000 square metres to assure a high standard and flexible production capacity. The latest computer technology is used for both design and production, combined with strict quality control procedures during all production phases, which translates into innovative, reliable and functional products that meet the various needs of the market. Its ISO 9001 certification, held since 1994, is the result of a qualityorientated philosophy on which SAMHYDRAULIK has always based its operation.
A H 4814
AXIOM HYDRAULICS (PTY) LTD Tel: (011) 334-3068 / 334-3086 Fax: (011) 334-4543 E-mail: axiomjhb@mweb.co.za
THESOUTH SOUTHAFRICAN AFRICANMECHANICAL MECHANICALENGINEER ENGINEER THE
17 Heidelberg Road, Village Main, Johannesburg, 2000 P O Box 260248, Excom, South Africa, 2023
VOL6362 October May 2012 VOL 2013