MTA-AUS 2014

CONEXPO-CON/AGG VIP SHOW GUIDE contains Floor Plans and a complete listing of companies exhibiting at the ConExpo-Con/Agg 2014 trade show in Las Vegas March 3-7, 2014. It also contains 2014 forecasts for the Aggregate, Concrete and Cement industries

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2014 VDMA MINING SUPPLEMENT | VDMA 59 VDMA could be kept: bearings free of axial forces (longer bearing lifetime, less heat), service without draining the oil, service from top, and a small footprint. The new Kamat gear ends (K8000M-3G to K40000M-3G) run so smooth; a coin placed vertically on the pump head will not fall while the pump is running, according to Kamat. This extremely low vibration level emits substantially less noise and allows no ise reduction by the softest possible suspension of the pump's drivetrain. Moreover, in modernizing the existing pump range, Kamat extended its pump range substantially in two directions. The pressure range of the standard Kamat pump range has been extended in the last few years to a reliable 3,500-bar pressure basically for cleaning and cutting applications. This is 10 times higher than what is needed for longwall hydraulics. Longwall pumps are Kamat's low-pressure pumps, but big longwalls with fast cutting shearers require increasingly greater flows. To satisfy that need, Kamat launched two quintuplex pumps rated at 530 kW (max.) and 800 kW (max.), the K50000M-5G and K80000M- 5G, respectively. These two pumps extended the range of the Kamat pumps from 12 to 14 available power ratings doubling the max avail- able power input for a single gearbox from 400 kW to 800 kW. When Kamat decided to double the power input of its pump designs, the whole production process had to be adapted for a new pump size. The old manufacturing machines could not machine the bigger pump heads and gearbox housings. The company built a second factory with bigger CNC centers, with automated handling systems and CAD/CAM ins tallations. In the main Kamat factory, the paint shop was redesigned to accept the 800-kW pumps. The test bed has been equipped with 1- MW power supplies. Joint research with German universities showed clearly that a triplex pump arrangement would not be able to deliver large flows (K80000 = max. 3,482 l/min) at an acceptable net positive suction head required (NPSHR) level. To eliminate cavitation, Ka mat opted for a quintuplex design and it has proved to be so reliable that the company says it is now able to supply units that can pump more than 600 l/min without the need of a booster. Low inlet valve pressure losses and low acceler- ation losses have eliminated the need for booster pumps. This is a big advantage for longwall mines. Removing booster pumps, their power supplies, switches, fuses, pipin g, base frames, etc., and relying on one pump system and its power supply simplifies the entire process. For longwall mines cutting coal, the K50000M-5G can deliver 641 l/min at 420 bar or 7,63 l/min at 360 bar. The K80000M-5G can deliver 1,185 l/min at 420 bar or 1,360 l/min at 375 bar. This means that a whole longwall can easily be powered with a single pump. For more than a year now, U.K. Coal's Kel lingley colliery has operated its longwall on a single K50055M delivering 641 l/min with a VFD drive. This is the simplest and easiest way to run a longwall. A K80000M-5G can easily handle any longwall application, according to Kamat. Big fluid flows, however, are more complicated to control than smaller flows. So Kamat also launched a new range of fail-safe smooth acting unloading valves for flows up to 1,500 l/min per pump at 500 Kamat changed the gear ends for its longwall pumps, but left thew wear parts the same. engineering for a better world GEA Mechanical Equipment GEA Westfalia Separator Group GmbH Werner-Habig-Stra├če 1, 59302 Oelde, Germany Phone: +49 2522 77-0, Fax: +49 2522 77-2828, High density volumes have finally found their master. The GEA Westfalia Separator CrudMaster decanter centrifuge automati- cally adjusts itself to ensure reliable processing without unwanted downtime. You need, we care. reliability care Excellence Down to the Smallest Detail Innovative separation technology CP-01-014

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