Introduction
Cavitation and net positive suction head (NPSH) issues are common detriments to effective pump operation that are often misunderstood. Entire plant systems can fail unexpectedly as a result of a mechanical-seal or pump component failure. Plant operators may observe: “it sounds like gravel is being pumped through our pipe” or “the pipe is shaking” or even “the pump components have dissolved into nothing.” When such failures are assessed further, operators often conclude that cavitation and NPSH are ultimately to blame for the seal and pump failure. As a result, all process engineers know that pump- suction design is most critical to ensuring reliable operation of any piping system.
Cavitation is caused when a pumping system’s net positive suction head available (NPSHa) is not in balance with the net positive suction head required (NPSHr) can be devastating for pump components and can even lead to system failure. Blackmer® has found a solution to the challenges of excessive cavitation with the development of the patented Cavitation Suppression Liner, which is available for use on most models of its Sliding Vane Pumps.