Bulk molding compound extends, improves pump performance

U.S. firm ZeMC2 reports that its pump parts made with a bulk molding compound (BMC) show no measurable or visual wear after five years of service.

ZeMC2 LLC (Salisbury, N.C., USA), a manufacturer of bulk molding compounds (BMC), reports that it has provided Carver Pump (Muscatine, Iowa, USA), one of the world’s largest and renowned manufacturers of high-end centrifugal pumps, with a new material that has eliminated measurable wear. A pump was returned to Carver Pump containing the parts manufactured with ZeMC2 BMC for refurbishing after five years in the field; upon disassembly and inspection, no measurable (0.000) or visual wear was detected on the wear bushing or on the shaft.

Typically, wear components have been placed sacrificially between the turning pump shafts and the stationary housings. The balance has always been to have wear components soft enough not to wear the shaft, but hard enough to last. This balance had not been reached until now.

Aaron Rutin, CEO of R3 Composites’, the molder for Carver Pump, says: “Carver Pump has been working with a potential new customer who is an OEM to sell them high-­pressure pumps (Carver Ring Section RS pump) for inclusion in their product. Each ring section in one of these pumps contains multiple wear rings and bushings made of Zeon ZeMC2 3033 HT [the technical name for the new material] molded and machined by R3 Composites. Carver Pump supplied one typical pump to this customer for their evaluation before placing orders. They ran this test pump through performance, endurance and accelerated usage test and returned it to Carver pump for inspection. The customer reported the pump ran beautifully no matter what they through at it. On inspection, it appears they ran everything but the kitchen sink through the pump without problems or loss of performance. Metal parts and hose fittings were found lodged inside the pump along with other discarded floor debris. All of the rings and bushings appeared to be in good shape with minimal dimensional change except for scars on the working surfaces where the foreign materials worked their way through the tight clearances on the pump during operation.”