The Asia Miner

JAN-FEB 2018

The ASIA Miner - Reporting Important Issues to Mining Companies in the Asia Pacific Region

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VDMA 48 VDMA MINING SUPPLEMENT • 2018 KAMAT GmbH & Co. KG . Salinger Feld 10 . 58454 Witten . Germany Phone: +49 2302 8903-0 . Fax: +49 2302 801917 . Mail: info@KAMAT.de . www.KAMAT.de Where others need more pumps, we simply use bigger ones. Our 5-plunger-pumps provide power - up to 800 kW. When using a variable speed drive, the range of adjustment is between 10 % to 100 %. Your advantages: less pumps, less service, longer lifetime and higher availability, energy savings. Plus: only one of the pumps in the system needs to be run by a variable speed drive. THIS REDUCES YOUR CAPITAL INVESTMENT.  58454 Witten  .  Germany  Mail: info@KAMAT.de  .  www.KAMAT.de Where others need more pumps, we simply use bigger ones. and higher availability, energy savings. Plus: only one of the pumps in the system needs to be run by a variable speed drive. THIS REDUCES YOUR CAPITAL INVESTMENT. High-pressure Pumps for Large Volume Flows The (water) hydraulic systems in various high-pressure plunger pump applications, especially longwall roof supports, are getting larger and larger. As a result, longwall operators are using multiple large triplex pumps given that the volume flow of these pumps is limited by design and for reasons of the high pressures involved. And the cylinder size is limited by cavitation which implies that it only makes sense to produce triplex pumps with ratings of "only" about 400 kW. KAMAT has now taken the next step and developed, on the basis of the thoroughly redesigned triplex pumps, the first quintuplex (five-cylin- der) pumps with a rating of 530 or 800 kW and the capability to reliably deliver distinctly larger volume flows than triplex pumps. The advantages for the longwall operator result from "economies of scale." A large pump is working far more cost-effectively than two or three smaller ones, and clearly needs less space — an important argu- ment in most modernization projects. A lot of detailed design work was, however, required to transfer the ba- sic concept of the triplex design to the quintuplex pump. The crankshaft, for example, is supported by multiple bearings, and the crossheads are oil spray lubricated rather than splash lubricated so that sufficient lubri- cation of the center crossheads is ensured as well. KAMAT nevertheless managed to keep spare parts stocking econom- ical through the use of many parts which are common to the triplex pumps. The housing was developed and optimized by KAMAT in close collaboration with the IFAS Institute at the Ruhr University Bochum who also simulated the thermal load of the pumps and carried out the re- spective optimizations. The quintuplex pumps furthermore offer the same advantages as the redesigned triplex pumps. They operate at extremely low-noise and low-vibration levels and are capable of working at full operating pressure over a speed range of 10 to 100% in conjunction with speed-controlled drives. Thus they can ideally be adapted to the respective volume flow requirements. The flow rate is not controlled through unloading valves in on/off technique but through an electronically controlled speed reg- ulation of the pump. As a result, wear is significantly reduced since the pump, the pipes and the valves are subjected to far less load. The first 530 kW quintuplex pump was quickly followed by an 800 kW model. The two versions are already produced in series, and the operators benefit from significant cost savings in terms of energy con- sumption and maintenance and service bills: Three 800 kW pumps — one each as a master, slave and standby unit which is the common constellation — are able to generate even very large volume flows at pressures up to 3,500 bar at highly economical rates. In the medium term, KAMAT will add a quintuplex pump with a rating of 1,200 kW to the portfolio. Economy of scale: KAMAT has developed the first quintuplex (five-cylinder) pumps with a rating of 530 or 800 kW on the basis of the thoroughly redesigned triplex pumps.

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