Pipeline
Pump Vibration and Failure J. C. Wachel, Pipeline
& Gas Journal, June 1986, pp. 32-34
Engineering Dynamics Inc. was asked to investigate and make recommendations
to alleviate problems experienced on a crude oil line in South America.
The investigation included modeling of the acoustical characteristics
of the suction and discharge piping systems using a digital simulation
technique and as well as a detailed field study to measure and evaluate
the pulsation and vibration characteristics of the pumps.
Four triplex
reciprocating crude oil pumps operating in parallel with a rated
speed of 275 rpm and a capacity of 388 gal. per min. experienced
repeated failures of the piping and pump components. The pumps
were installed at the Dina Station on a major crude oil pipeline
in Colombia. Several changes were made in the piping system and
accumulators in an attempt to improve the vibrations and reduce
the failures. However, the failures continued.
Solutions
developed to eliminate the problems were installed in January
1985. A follow-up field study was made to determine if the modifications
were adequate for long-term reliability. Since the recommended
modifications were installed, the pumps have delivered 40,000
bbl per day with no piping failure and only normal maintenance.
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