The paper describes the use made of a microcomputer and a spectrum analyser to monitor the con-dition of an emulsion pump, and of the vibration and pressure rippler methods to carry out the fault diagnosis through the dynamic characteristic traces of as new pump to be compared with those of the faulty pump, and analyses the causes of the pressure ripple pattern to become unusual for the faulty pump in detail and the effects on thepump performance. The purpose of the condition monitoring being to determine which monitoring devices or techniques best indicated relevant deterioration of the pump. The pump was fuly instrumented with a variety of transducers each one of which was constantly monitored by the computer and the spectrum analyser. The pump was put through a series of severe conditions or a part of its hydraulic end was removed, the computer scanned the various transducers, the outputs of which were displayed on a VDU and saved to a cassette, adn the dynamci state features were captured on an FM tape recorder. The computer condition monitoring of the pump successfully reveals that the delivery of the pump is the faulty sympom and the inlet flow restricted is the key to cause the deterioration of the its performances.
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