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New Material Eliminates Failures in Asphalt-Lubricated Pump

A reaction bonded silicon carbide material helped dramatically reduce the mean time between repair (MTBR) cycle due to premature bearing failures on an asphalt-lubricated bearing pump. The application is difficult because it involves pumping abrasive asphalt at temperatures to 425ø F. The pump originally used antrification bearings, but these failed in one to three months because the solid particles in the asphalt loaded up the bearing raceways, prohibiting sufficient bearing lubrication. A group of six pumps were used at an oil refinery in Canada to load paving asphalt into tractor trailers. The liquid being pumped has 5% solids ...

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