Coal Age

MAY 2019

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May 2019 www.coalage.com 33 operating ideas continued for individuals working at the front of the pump unit. "Manually adjusting an alloy throatbush on a large pump requires several people and is labor intensive. It requires mechanical tools to adjust the four pusher bolts, one at a time, in order to reduce the gap between the throatbush and impeller. We want- ed to find a safer and quicker way to extend the wear life of the pump with regular adjustments, which led us to development of this technology," said Marcus Lane, global product man- ager for centrifugal pumps for Weir Minerals. "Our automated throatbush ad- justment solutions are available for pumps fitted with either rubber or alloy throatbushes on Warman slur- ry pumps used in the most arduous applications, and have been designed with our customers' safety and pump operation in mind," said Ron Bour- geois, director of slurry pumping technology group for Weir Minerals. Weir said its automated adjust- ment systems speed up the process, allowing for more frequent adjust- ments with minimal effort. When maintaining an alloy throatbush, all four bolts are adjusted at the same time to ensure even adjustment and accurate positioning, improving the wear life of the throatbush. Rubber throatbush adjustment is considerably different because it poses the risk of hysteresis and pre- mature failure of the throatbush. The goal is not to adjust to a minimum clearance, but to maintain a standard gap to ensure there is no contact be- tween the impeller and throatbush, while periodically rotating the throat- bush face to avoid acceleration of lo- calized wear. "We developed an automated ro- tating solution, which maintains an optimum gap between the throat- bush and impeller front shroud for the particles to flow through without catching and tearing the rubber. The localized surface wear is usually near the discharge position, but by slowly rotating the throatbush, we even out the material loss over the entire face. Field results have been very positive, showing an average of 40% increase in wear life," said Claudio Needham, ap- plication engineer for Weir Minerals. For the smaller Warman slurry pumps used in medium- to heavy-du- ty applications, Weir Minerals offers a single-point adjustment mechanism, providing both axial and rotational repositioning. This allows one indi- vidual to safely stand to the side of the pump while making the adjustment. Weir said mine operators who have tested its adjustment technology have reported improved wear life and safer, simpler maintenance through the process of regular adjustment.

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