Canned Motor Pump Failure: A Case History of Canned Motor Pump Failures - Demystifying the Thrust force - (PPT)

摘要

The subject pump is a Overhung Canned Motor Pump pumping Condensate with traces of Ethylene Oxide. The pump has a thrust balancing mechanism comprising of a rotating thrust disk and a stationary carbon ring. The pump has a secondary impeller which takes suction from main discharge line and circulates the cooling fluid to cool the motor windings. The pump is installed with a axial position measuring device called "ARM 2000? Which provides the real time position of the rotor. The axial position signal is monitored in DCS with an alarm and trip interlock. In addition to axial position, winding temperature of the motor and power output also has signals coming to DCS, though without alarms.