same aug 2012
DESCRIPTION
SA Mechanical Engineer is the official magazine of the SA Institution of Mechanical Engineering. It is also endorsed by the following bodies: SA Pump Manufacturing Association, SA Valve and Actuators Association, Association of Societies for Occupational Health & Safety, Institute for Certificated Mechanical & Electrical Engineers, SA Institute of Tribology, Institute of Nuclear Engineers SA, SA Institute of Non-destructive Testing, SA Association of Consulting Engineers and The National Society of Black Engineers.TRANSCRIPT
2 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 201214 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 May 2012
AXIOM HYDRAULICS (PTY) LTD
HA
Tel: (011) 334-3068 / 334-3086 Fax: (011) 334-4543E-mail: [email protected]
SAMHYDRAULIK, which is one of the leaders in the field of hydraulictransmission, has been operating for over 25 years in the internationalmarket, offering a complete range of orbital hydraulic motors and power steering units, axial pumps andmotors for medium and highpressure ranges, all characterisedby excellent performances.
SAMHYDRAULIK employs 120people who operate inside avery modern and efficient plantthat spans over 6 000 squaremetres to assure a high standardand flexible production capacity.The latest computer technologyis used for both design andproduction, combined withstrict quality control proceduresduring all production phases,which translates into innovative,reliable and functionalproducts that meet the various needs of the market.Its ISO 9001 certification,held since 1994, is theresult of a quality-orientated philosophyon which SAMHYDRAULIKhas always based itsoperation.
17 Heidelberg Road, Village Main, Johannesburg, 2000P O Box 260248, Excom, South Africa, 2023
Axiom Jan11.indd 1 2011/03/14 10:58:12 AM
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 3
Chris ReayChairman of the Working
Committee: Communications(SA Institution of Mechanical
Engineering)
4 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
We drive the mining industry
Geared Motors \ Drive Electronics \ Drive Automation \ Industrial Gears \ Services
SEW-EURODRIVE, a BEE company, leaders in the field of geared motors are now able to supply an Industrial Gear Unit that offers more efficiency for mixing and agitating applications with their MC range of Extended Bearing Distance (EBD) Industrial Gear Units.
In process plants, large axial and radial forces occur at the agitator shaft during agitating processes. Traditional designs solve this problem with separate, external bearings that take on the function of the agitator shaft bearings, a solution that very often proves cost intensive. Our new EBD concept extends the bearing span across the low speed shaft and offers stronger bearings within the gear unit itself, which means that in many cases separate bearings are no longer required in the agitator or an over sizing of the gear unit can be avoided. These high torque MC Industrial Gear Units can be used for the reliable operation of mixers, mounting flanges, agitators and surface aerators.
SEW-EURODRIVE - Driving the world.
Come and visit us at Electra Mining. Live in Hall 6, Stand J20 at the Nasrec Expo Centre in Johannesburg on 10th - 14th September 2012. We look forward to seeing you there!
1Thr
ead_
4565
_SA
M
Tel: +27 11 248-7000 Web: www.sew.co.za
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 5
The monthly circulation is 4 242
6 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 7
Forthcoming Training Events Programmes, fees and registration forms may be obtained from Carey Evans on E-mail [email protected] or Tel. 031-764-7136. Also, detailed individual event programmes are available from Carey.
Code Abbreviated Title Date – Start Date – End Region
C0212 Boiler House; Safety Valves 5 Sep 12 7 Sep 12 Cape Town
C2512 Effective Management Roles 26 Sep 12 26 Sep 12 Cape Town
E0212 Boiler House; Safety Valves 3 Oct 12 5 Oct 12 East Rand
A0212 Boiler House; Safety Valves 10 Oct 12 12 Oct 12 Durban
E2912 Lubrication & Lubricants 17 Oct 12 17 Oct 12 East Rand
E61A2 Leadership & Management Roles 17 Oct 12 18 Oct 12 East Rand
E2912 Lubrication & Lubricants 17 Oct 12 17 Oct 12 East Rand
C5612 Problem Solving for Engineers 24 Oct 12 24 Oct 12 Cape Town
E5612 Problem Solving for Engineers 14 Nov 12 14 Nov 12 East Rand
A5612 Problem Solving for Engineers 21-Nov-12 21-Nov-12 Durban
In-House WorkshopsTo obtain a comprehensive list of workshops that may be held In-House or to discuss your corporate training needs, kindly contact National Events Manager, Linda Robinson on E-mail [email protected] or Tel: 031 764 7136.
8 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
“The launch of the system at a school in the north-western province
Fritz Fourie, managing director of Hansen Transmissions SA
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 9
The teacher can schedule a programme on a specific subject matter at a time when they’re actually dealing with the subject in class
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 11
Adrie Conradie
Academic
Career Path
Achievements
Projects
Commentary
12 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
ExcellentMineralsSolutions
For more information contact us on: +27 (0)11 9292600www.weirminerals.com
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.
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.
WARMAN®Centrifugal Slurry Pumps
ENVIROTECH®Centrifugal Slurry Pumps
ISOGATE®Slurry Valves
Expertise where it counts
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.
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 13
Gavin Halse MD, ApplyIT
14 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 15
16 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 19
20 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
0861 00 ZEST (9378) | www.zest.co.za
Cora
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To find out more scan the code
or visit: zest.co.za/sustainability
BLUE IS THE NEW GREEN
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 21
22 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
24 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
Stieber Clutch, Germany has been designing and manufacturing high speed freewheels/backstops for over thirty years, particularly in the mining sector. One of the latest designs is to accommodate an application with several drives, a load-sharing backstop and an optional feature which provides a release function. This is aimed at more safety under-load and two types of release functions are available. Overloads on a conveyor or belt jams are the problem areas where the release function will provide the safety of a controlled release of tension.
All heavy industry and mining sites operate with incline conveyors and rotary machines, kilns, fans, crushers, etc. The gear drives will have a high speed backstop or backstops mounted either on the high speed or medium speed shafts. When in use, reduction in power loss is experienced because of the contact-free components of the backstop at high speed.
Multiple drives on large conveyors are the sector for which the load sharing backstop is de-signed. A smaller size backstop can be selected based on the actual load and not the E-motor
stall torque, as the case would be when using a standard rigid backstop. This also contributes to savings in power and cost.
The backstop with the release function is suitable for any conveyor. Should there be a belt jam or problem, employees can safely work on the conveyor or in the environment of the conveyor, confi dent that,
even though the power be off, the belt would no longer be under tension. A very important safety aspect.
A backstop would be selected for safety. The backstop is expected to run continuously for any number of years and if and when a problem occurs, such as a power cut, overload, or belt jam, the backstop is
relied upon to provide the safety according to the design specifi cations. The assurance of the Stieber load-sharing backstop performing when needed comes from the friction linings which are oil impregnated throughout. This
means that throughout years of extended use or stand times, the slipping torque remains constant because the contacts between linings and pressure plates are not affected by constant corrosion or contamination from oil.
Stieber provides a load-sharing backstop with a release function through an internal hydraulic system. This allows a rapid controlled release of tension when a belt is jammed. The release function can be
stopped at any time by the operator which offers more safety and aids productivity. It is easily un-derstandable and can be locally actuated with a hand pump connection. Another option would
be a remote or centralized operation.
Stieber are prepared to meet customized applications for specifi c requirements in per-formance and the Stieber RS Series of load-sharing backstops are specifi cally for
durability and high reliability. Standard models are available in considerable variety up to 300,000 Nm hold torque.
Sprag Components cc, agent of Stieber Clutch for Africa. We are proud to an-nounce the launch of the newly developed and tested products of Stieber Clutch.
• Anti Rollback• Back Stops• Back Stopping Clutches• Cam Clutches• Centrifugal Lift Off Clutches• Compressor Drive Clutches• Concrete Mixer Clutches• Conveyor Back Stops• Conveyor Idler Brakes• Conveyor Indexing Clutches• Crusher One Way Clutches• Drawn Cup Needle Roller Bearings• Drive Couplings (One Way)• Drive Pulleys (One Way)
• Drive Units (One Way)• Electric Motor Back Stops• Engaging Clutches (One Way)• Fan Clutches (Back Stops)• Freewheels• Gearbox Back Stops• Holdbacks• Low Speed Back Stops• Over Running Clutches• Press Clutches• Repair Service Back Stops• Repair Service Holdbacks• Repair Service Torque Arms• Roller Drive Couplings (One Way)
• Roller Ramp Clutches• Semi High Speed Clutches• Special Purpose Couplings• Sprag Clutches• Test Bench Drive Couplings• Torque Arms• Torque Limiting Clutches• Torque Limiter Couplings• Underground Haulage Back Stops• Winch Back Stops• Winch Clutches• Wrap Spring Clutches
One-way Rotation Control
Applications:
Member: Mr W Swaffi eld Cell: +27 (0) 82 553 0717 E-mail: [email protected]: 57 Eva Road, Fairleads, Benoni, Gauteng, South Africa Postal Address: P.O. Box 16355, Atlasville, Gauteng, South Africa, 1465Tel: +27 (0) 11 742 9600 / +27 (0) 11 965 0394 Fax: +27 (0) 11 965 0330 / +27 (0) 86 647 4299 E-mail: [email protected]/[email protected]/[email protected] No: 1991/017881/23 Vat No: 474 013 2149
Other Design characteristics 1. Friction linings (RSRV, RSRT, RSCI-LK) The friction linings control the slip torque. When the backstop is released, some lubricant may get to the friction linings surface.
In order to keep a constant friction coeffi cient and then a constant slip torque to the unit, Stieber has chosen and tested oil im-pregnated linings. This solution also insures that the latter will also not be submitted to contact corrosion.
2. Bearing support of the outer race. (RSCI-LK)In order to allow the unit to be released under torque, the complete backstop assembly must rotate backwards from a fraction of to several complete rotations.
The bearing allows this rotation without interfering on the slip torque and without damage to the centring device like it would happen with the classical centring spigot that is generally used for the other units.
3. Hydraulic operation (RSCI-LK) The hydraulic device used to release the backstop insures a rapid, progressive and controlled backstop release. The operation can be interrupted at any time. In case of a multiple backstop system, it is possible to link these, in order to operate them simultaneously from a centralised location.
The hydraulic integral system is protected against temperature fl uctuations.
The optional hydraulic hand pump is set to the maximum working pressure of the unit.
Note: It is possible to make such designs for low speed shafts using a roller or conventional sprag type back-stops.
Overrunning clutches and backstopsTypes RSRV, RSRT and RSCI–LKLoad sharing and releasable backstops
IntroductionTypes RSRV (load sharing) and RSRT/RSCI-LK (releasable) are centrifugal lift off sprag type backstops with an integral torque limiter. The inner race overruns. Please refer to the RSCI/RSXM catalogue pages for basic information that apply also for the above mentioned models.
These backstops are primarily intended for installation on the high speed or intermediate shaft of the driving machines in multiple drive arrangements, where two or more backstops share the reverse load, such as on large inclined conveyors. This design allows the selection of smaller backstops than an arrangement without a load sharing device.
The same principle offers a backstop protection when a temporary overload occurs. Please contact Stieber for any further usage of this model.
The slipping torque is factory set to the customer's requirement. The high quality friction linings ensure a consistent and reliable friction coeffi cient even when lubricant has reached the friction faces or after a long time without slippage. Maximum set values are shown in the data sheet.
RSRVType RSRV is the basic model. It operates as load sharing device when several backstops are working together on the same machine and needs no attention when installed. The function is automatic and no maintenance is requested.
RSRT (RSCI-LK)These models include a release facility which, in the event of a blockage or stalked belt condition, allows the stored energy to be released in a safe and controlled manner.
The RSRT features a mechanical release. The operator must tight progressively 3 big screws that release the spring forces on the pressure plate. When the screws are loosen again the backstop is automatically re-set to the original slipping torque.
The RSCI-LK features a hydraulic release. An integrated hydraulic cylinder actuated by a simple hand pump, progressively releases the backstop. When the oil pressure is released the backstop is safely and automatically re-set to the original slipping torque.
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 25
Stieber Clutch, Germany has been designing and manufacturing high speed freewheels/backstops for over thirty years, particularly in the mining sector. One of the latest designs is to accommodate an application with several drives, a load-sharing backstop and an optional feature which provides a release function. This is aimed at more safety under-load and two types of release functions are available. Overloads on a conveyor or belt jams are the problem areas where the release function will provide the safety of a controlled release of tension.
All heavy industry and mining sites operate with incline conveyors and rotary machines, kilns, fans, crushers, etc. The gear drives will have a high speed backstop or backstops mounted either on the high speed or medium speed shafts. When in use, reduction in power loss is experienced because of the contact-free components of the backstop at high speed.
Multiple drives on large conveyors are the sector for which the load sharing backstop is de-signed. A smaller size backstop can be selected based on the actual load and not the E-motor
stall torque, as the case would be when using a standard rigid backstop. This also contributes to savings in power and cost.
The backstop with the release function is suitable for any conveyor. Should there be a belt jam or problem, employees can safely work on the conveyor or in the environment of the conveyor, confi dent that,
even though the power be off, the belt would no longer be under tension. A very important safety aspect.
A backstop would be selected for safety. The backstop is expected to run continuously for any number of years and if and when a problem occurs, such as a power cut, overload, or belt jam, the backstop is
relied upon to provide the safety according to the design specifi cations. The assurance of the Stieber load-sharing backstop performing when needed comes from the friction linings which are oil impregnated throughout. This
means that throughout years of extended use or stand times, the slipping torque remains constant because the contacts between linings and pressure plates are not affected by constant corrosion or contamination from oil.
Stieber provides a load-sharing backstop with a release function through an internal hydraulic system. This allows a rapid controlled release of tension when a belt is jammed. The release function can be
stopped at any time by the operator which offers more safety and aids productivity. It is easily un-derstandable and can be locally actuated with a hand pump connection. Another option would
be a remote or centralized operation.
Stieber are prepared to meet customized applications for specifi c requirements in per-formance and the Stieber RS Series of load-sharing backstops are specifi cally for
durability and high reliability. Standard models are available in considerable variety up to 300,000 Nm hold torque.
Sprag Components cc, agent of Stieber Clutch for Africa. We are proud to an-nounce the launch of the newly developed and tested products of Stieber Clutch.
• Anti Rollback• Back Stops• Back Stopping Clutches• Cam Clutches• Centrifugal Lift Off Clutches• Compressor Drive Clutches• Concrete Mixer Clutches• Conveyor Back Stops• Conveyor Idler Brakes• Conveyor Indexing Clutches• Crusher One Way Clutches• Drawn Cup Needle Roller Bearings• Drive Couplings (One Way)• Drive Pulleys (One Way)
• Drive Units (One Way)• Electric Motor Back Stops• Engaging Clutches (One Way)• Fan Clutches (Back Stops)• Freewheels• Gearbox Back Stops• Holdbacks• Low Speed Back Stops• Over Running Clutches• Press Clutches• Repair Service Back Stops• Repair Service Holdbacks• Repair Service Torque Arms• Roller Drive Couplings (One Way)
• Roller Ramp Clutches• Semi High Speed Clutches• Special Purpose Couplings• Sprag Clutches• Test Bench Drive Couplings• Torque Arms• Torque Limiting Clutches• Torque Limiter Couplings• Underground Haulage Back Stops• Winch Back Stops• Winch Clutches• Wrap Spring Clutches
One-way Rotation Control
Applications:
Member: Mr W Swaffi eld Cell: +27 (0) 82 553 0717 E-mail: [email protected]: 57 Eva Road, Fairleads, Benoni, Gauteng, South Africa Postal Address: P.O. Box 16355, Atlasville, Gauteng, South Africa, 1465Tel: +27 (0) 11 742 9600 / +27 (0) 11 965 0394 Fax: +27 (0) 11 965 0330 / +27 (0) 86 647 4299 E-mail: [email protected]/[email protected]/[email protected] No: 1991/017881/23 Vat No: 474 013 2149
Other Design characteristics 1. Friction linings (RSRV, RSRT, RSCI-LK) The friction linings control the slip torque. When the backstop is released, some lubricant may get to the friction linings surface.
In order to keep a constant friction coeffi cient and then a constant slip torque to the unit, Stieber has chosen and tested oil im-pregnated linings. This solution also insures that the latter will also not be submitted to contact corrosion.
2. Bearing support of the outer race. (RSCI-LK)In order to allow the unit to be released under torque, the complete backstop assembly must rotate backwards from a fraction of to several complete rotations.
The bearing allows this rotation without interfering on the slip torque and without damage to the centring device like it would happen with the classical centring spigot that is generally used for the other units.
3. Hydraulic operation (RSCI-LK) The hydraulic device used to release the backstop insures a rapid, progressive and controlled backstop release. The operation can be interrupted at any time. In case of a multiple backstop system, it is possible to link these, in order to operate them simultaneously from a centralised location.
The hydraulic integral system is protected against temperature fl uctuations.
The optional hydraulic hand pump is set to the maximum working pressure of the unit.
Note: It is possible to make such designs for low speed shafts using a roller or conventional sprag type back-stops.
Overrunning clutches and backstopsTypes RSRV, RSRT and RSCI–LKLoad sharing and releasable backstops
IntroductionTypes RSRV (load sharing) and RSRT/RSCI-LK (releasable) are centrifugal lift off sprag type backstops with an integral torque limiter. The inner race overruns. Please refer to the RSCI/RSXM catalogue pages for basic information that apply also for the above mentioned models.
These backstops are primarily intended for installation on the high speed or intermediate shaft of the driving machines in multiple drive arrangements, where two or more backstops share the reverse load, such as on large inclined conveyors. This design allows the selection of smaller backstops than an arrangement without a load sharing device.
The same principle offers a backstop protection when a temporary overload occurs. Please contact Stieber for any further usage of this model.
The slipping torque is factory set to the customer's requirement. The high quality friction linings ensure a consistent and reliable friction coeffi cient even when lubricant has reached the friction faces or after a long time without slippage. Maximum set values are shown in the data sheet.
RSRVType RSRV is the basic model. It operates as load sharing device when several backstops are working together on the same machine and needs no attention when installed. The function is automatic and no maintenance is requested.
RSRT (RSCI-LK)These models include a release facility which, in the event of a blockage or stalked belt condition, allows the stored energy to be released in a safe and controlled manner.
The RSRT features a mechanical release. The operator must tight progressively 3 big screws that release the spring forces on the pressure plate. When the screws are loosen again the backstop is automatically re-set to the original slipping torque.
The RSCI-LK features a hydraulic release. An integrated hydraulic cylinder actuated by a simple hand pump, progressively releases the backstop. When the oil pressure is released the backstop is safely and automatically re-set to the original slipping torque.
26 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
POWER GENERATION NEWS
PROMECH PUB p - T, O, G 2/20/11 9:54 PM Page 2
Composite
C M Y CM MY CY CMY K
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 27
POWER GENERATION NEWS
Visit us at the finish line Electra Mining Stand E6 Hall 6
BLAZING A TRAIL THROUGH CHANGEThe CMG name has changed to Regal. As a global player, we offer cutting-edge technology to enhance product
quality and service excellence for which we are already renowned. We boast a 2 year warranty on our new
Marathon motor - an industry first! We combine global and local expertise to deliver efficient, cost effective
solutions for lowest cost of ownership. Choose the right partner when running your Marathon.
28 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
Knockout Unexpected OutagesMDX pumps are designed to match the life cycle of your mills. At a major copper mine in Chile, GIW’s patented hydraulic design and advanced materials have almost tripled parts life. The result was a reduction in costs and increased production at the mine site.Got a hard rock slurry problem?
GIW offers expert slurry pumping solutions around the globe. Minerals are everywhere. So is GIW.
KSB Pumps and Valves (Pty) Ltdwww.ksbpumps.co.za
Pumps Valves Systems
MDX 750 Pump
A KSB Company
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 29
30 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 31
(6)
Figure 1: L10 bearing life with percentage axial load
(5)
Bearing L10h life1 174,248
2 165,598
3 125,120
4 61,166
5 131,731
6 111,276
7 993,794
8 26,713,820
Table 1: Individual L10h bearing life for a typical conveyor gear unit
32 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
Figure 2: Typical conveyor gear unit layout
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 33
Figure 3: Minimum required viscosity, v
Figure 4: Actual operating viscosity, v
34 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
Figure 5: a23 Life adjustment factor graph
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 35
Daan Louw of Verder Pumps SA
36 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
A peristaltic pump in a slurry application
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 37
Marius Heyns, CEO of Basil Read
Representing one of the most significant in-novations in the past 80 years, the patented, Volvo pipelayer represents a major step forward”
David Vaughan, sales director at Babcock
38 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 39
For your FREE GIFT, scan
or visit www.bearings.co.za
On par with your needsOn par with your needs
Technical Expertise - Service - Quality - Training
• Bearings • Couplings • Chains • Sprockets • Pulleys • V-Belts • Gearboxes • Geared Motors
• Electric Motors • Oil seals • Lubricants and
cleaners • Many other allied products
Technical Expertise - Service - Quality - Training
• Bearings • Couplings • Chains • Sprockets • Pulleys • V-Belts • Gearboxes • Geared Motors
• Electric Motors • Oil seals • Lubricants and
cleaners • Many other allied products
For your , scan
or visit www.bearings.co.zaFREE GIFT
After Hours National Hotline: 083 250 9191After Hours National Hotline: 083 250 9191
Not just a bearing shopNot just a bearing shop
BBBEE Level 3BBBEE Level 3
40 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
Pre-registration is now open for Electra Mining Africa, the ultimate market place for all stakeholders involved in the mining, construction, industrial and power generation industries.
Visitors can expect to see leading local and international industry players in the packed halls and outside precincts. It’s the ideal place to view the latest in technology and equipment, innovative products and new supplies and services.
Experts will be on hand to give advice, live demonstrations will be happening daily and co-located conferences and workshops will add even greater value.
Electra Mining Africa is recognized as the second largest mining show in the world and the biggest trade exhibition in southern Africa with global recognition for its broad reach across mining, construction, industrial and power generation industries.
Electra Mining Africa and co-located Elenex Africa, Machine Tools Africa and Transport Expo runs from 10-14 September 2012 at the Expo Centre, Nasrec, Johannesburg, South Africa.
T r a n s p o r t f o r t h e M i n i n g I n d u s t r y
THE BIGGEST M
ININ
G
AND ELECTRIC
AL TRADE
SHOW IN
SOUTHERN AFRIC
A
PRE-REGISTER AND BE PART OF THE IN-CROWD
INTERNATIONAL MINING, INDUSTRIAL, CONSTRUCTION AND POWER GENERATION EXHIBITION SHOWCASES NEW
INNOVATIONS, PRODUCTS, SERVICES AND TECHNOLOGIES
M I N I N G • I N D U S T R I A L • C O N S T R U C T I O N • P O W E R
VISIT
co-locating in hall 9
Contact the Marketing Director at Specialised ExhibitionsLeatitia van Straten
[email protected]+27 (0) 11 835 1565
www.electramining.co.za
PRE-REGISTER FOR FREE ENTRYIt’s simple – just complete the registration form at
www.electramining.co.zaR15 per vehicle, per day for secure parking
SKET
CH46
17/1
2
10 - 1
4 September 2
012
Expo Centre
, Nasre
c, Jh
b, South
Afri
ca
9am - 5
pm daily
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 41
Eco- friendly solutions
Water jet-cutting and profiling expert AquaJet Profiles supplies highly-specialised precision-cutting services for complex applications within various industries in South Africa, ranging from aerospace and petrochemical, to architecture and mineral processing.
Johannesburg-based AquaJet uses the powerful cutting force of water and garnet sand to create a unique cutting tool known as a jet, explains company director Preeshan Naidoo. “The AquaJet cutting process involves the use of ultra high-pressure water at 3 500 bar, which is pumped through a diamond jewel with a 0,2 mm diameter hole – accelerating the water to Mach 2,5. The abrasive garnet sand is then introduced into the stream of water, and is also accelerated to Mach 2,5.”
Preeshan notes that the greatest advantage of aqua-jetting is that it is able to cut material with pinpoint accuracy, without interfering with the material’s inherent structure. “Unlike plasma cutting, aqua-jetting entirely eliminates the heat affected zones (HAZ) during the cutting process; thereby, enabling metals to be cut without harming or changing intrinsic properties. The process is essentially the same as water erosion found in nature, but greatly accelerated and concentrated.”
Aqua-jetting can be applied to almost any manufacturing material. “Aqua-jetting is particularly-beneficial in applications where expensive alloys such as copper, aluminium and tita-nium need to be cut with complete accuracy, and minimal waste. The precision of our cutting is based on our proximate settings and fine tuning, holding tolerances between 0,09 mm to 0,35 mm, and only 75 percent loss per millimetre.”
AquaJet Profiles Preeshan Naidoo, Tel: (011) 908-5550,Email: [email protected], Web: www.aquajetprofiles.co.za
42 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
The Mobicon mobile container handling system from BLT SA is designed for efficient, safe and versatile container and product handling, in and around automotive assembly plants.
Meclift variable reach trucks are also suitable for use in automotive plants. These units have a 16 ton lifting capacity and at full reach of 2.5 metres, they can safely lift 7 tons. Meclift reach trucks are able to go into a container for efficient, swift and safe container stuffing, de-stuffing and are also designed for handling all types, sizes and shapes of goods. These 16 ton units are able to stack empty, 6 metre containers, three high.
THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 43
MARKET FORUM
44 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
Pump protection
unit The SkidRat pump protection unit is attracting attention in the industry as an ideal way to prevent pumps from being damaged by sediment at the bottom of ponds. This innovative unit was developed by UAT in Australia and is exclusively distributed throughout sub-Saharan Africa by Xylem (formerly known as ITT Water & Wastewater South Africa). Harnessing a pontoon approach, the SkidRat features modular floats that lend this unit to unlimited configurations to suit each pump and application. The tough and durable unit is chemical re-sistant and can be handled by cranes, excavators, dozers, trucks and trailers.
Xylem, Lee Vine, Tel: (011) 966-9300, Web: www.xylemwatersolutions.com
The Australian developed SkidRat is now available from Xylem and offers an ideal way to prevent pumps from being damaged by sediment at the bottom of ponds.
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THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 45
MARKET FORUM
The first of the 12 purpose-built 1,2 MW main pump motors for NamWater’s Von Bach-Windhoek Transfer Capacity Project is shown here ready for dispatch from ACTOM Electrical Machines’ Benoni plant.
Two pres t ig ious contractsActom Electrical Machines recently won export contracts worth a total of R14,5-million from two prominent customers – an international pump manufacturer based in Italy, and Namibia’s water supply authority NamWater.
The pump manufacturer is KSB Pumps, which placed an order with Actom Elec-trical Machines in January this year for a total of 44 medium and low voltage motors – all destined for use in the water treatment plant currently under construction at Eskom’s new Kusile coal-
fired power station near Delmas in Mpumalanga.
A noteworthy aspect of the medium voltage motors portion of the order is that it represents Alstom’s first large contract for motors in their new MS4 series of high-spec medium voltage cast-iron motors, which were launched into the market early this year.
The MS4 series, which have replaced
the 1LA1 series previously on offer, comprises totally-enclosed fan cooled (TEFC) motors in the 200 kW to 1100 kW power range, with frame sizes of between 355 and 500 and voltages of 3,3 kV, 6,6 kV and 11 kV.
The contract for NamWater is for the manufacture and supply of 12 cus-tomised high efficiency main pump motors which are to be installed at the Von Bach-Windhoek Transfer Capacity Project, which is aimed at expanding the water supply system for Windhoek.
The motors, which will be purpose-built to NamWater’s stringent specifications, are 1,2 MW 4-pole 690 V Unibox units designed for variable speed drive ap-plications.
Actom Electrical Machines, Paul Lepora, Tel (011) 899-1114, Fax (011) 899-1371E-mail [email protected], Web: www.actom.co.za
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46 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
EXPERIENCE THE POWER OF TURNING VISION INTO REALITY.
www.walter-tools.com
Spectra Carbide Tooling Technology (PTY) Ltd.
24 Desmond Street, Korsten, Port Elizabeth
PO Box 2631, North End, 6056 Tel: 0860 23 23 23 Fax: 0860 33 22 33
[email protected] www.spectra-sa.co.za
Engineer what you envision.
WALTE-12-018_Anz_SA.indd 1 30.03.12 10:35
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THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012 47
EXPERIENCE THE POWER OF TURNING VISION INTO REALITY.
www.walter-tools.com
Spectra Carbide Tooling Technology (PTY) Ltd.
24 Desmond Street, Korsten, Port Elizabeth
PO Box 2631, North End, 6056 Tel: 0860 23 23 23 Fax: 0860 33 22 33
[email protected] www.spectra-sa.co.za
Engineer what you envision.
WALTE-12-018_Anz_SA.indd 1 30.03.12 10:35
48 THE SOUTH AFRICAN MECHANICAL ENGINEER VOL 62 August 2012
936
011
Reliability. Made by SchaefflerSchaeffler is the bearing specialist in the field of mining. For excavating, conveying and processing, our service accompa-nies the bearings throughout their entire life cycle. Both our standard range and special bearing designs are tried and test-ed in the toughest of environments and offer ideal solutions to the most challenging applications.
Three examples: For time-saving bearing replacement in hard to reach locations, our FAG split spherical rolling bearings minimize downtime saving you time and money. In conveyors, our new FAG Black Series is interchangeable according to JIS and has Durotect® B coated bearing rings for improved corro-sion resistance. And the FAG SmartCheck, an innovative sensor for real time monitoring, provides greater safety for machines and plants.
For more information please contact: Schaeffler South Africa – Industrial 1 End Street Ext. · 2000 Johannesburg · South Africa Phone +27 11 225 3000 · Fax +27 11 225 3092 [email protected]
936011_Mining_A4_SA_Diana.indd 1 03.08.2012 11:05:12