DuPont Vespel CR-6100 line-shaft bearings available from Fluid Seals were installed in an industrial washing pump to prevent run-dry failure during operation.
A Layne & Bowler 3-stage vertical pump was being used to wash out bulk railcars before loading them with polyethylene and polypropylene at a resin plant in La Porte, Texas, USA. The process fluid consisted of water and washing debris while the process temperature was ambient.
Frequent run-dry events occurred in the pump when debris blocked the suction inlet or when water in the sump fell below the minimum suction level. Run-dry events caused the pump’s line-shaft bearings to fail three or four times a year.
DuPont Vespel CR-6100 parts were installed in the pump as line-shaft bearings to replace the existing bearings.
A month after the installation of Vespel CR-6100 bearings, the pump ran dry for about 3 hours. Once the suction conditions were restored, the pump was restarted and exhibited no damage.
DuPont Vespel CR-6100 bearings offer proven long-term reliable performance with the pump running without failure since October 2003.
DuPont Vespel CR-6100 was selected for the line-shaft bearings because of its anti-seizing properties and ability to survive run-dry events.
Made from an advanced composite material consisting of DuPont Teflon PFA fluoropolymer resin and oriented carbon fibres, Vespel CR-6100 has a low coefficient of friction, low wear rate, high PV capability, and a coefficient of thermal expansion 70% lower than that of carbon steel.