Displacement
Pump Performance, Instrumentation & Diagnostics
J. C. Wachel/F. R. Szenasi, Pump Handbook, McGraw-Hill, Sec.
3.7, 2nd Ed., 1986.
The most common
operational and reliability problems in reciprocating positive displacement
pump systems are characterized by, low net positive suction head
(NPSH), pulsations, pressure surge, cavitation, waterhammer, vibrations
of pump or piping, mechanical failures, wear, erosion, alignment,
high horsepower requirements, high motor current, torsional oscillations,
temperature extremes, thermal cycling, harsh liquids: corrosive,
caustic, colloidal suspensions, precipitates (slurries). While any
component in a pump system may be defective, most operational problems
are caused by liquid transient interaction of the piping system
and pump system or by purely mechanical interaction of the pump,
drive system, foundation, etc. This section discusses hydraulic
and mechanical problems and suggests measurement and diagnostic
procedures for determining the sources of these problems.
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