Pump and Motor Preventative Maintenance Program
Jun 08, 2011 · 5. Fixed throttle operation. Pumps throttled at a constant head and flow indicate excessive capacity. 6. Noisy pumps or valves. A noisy pump generally indicates cavitation from heavy throttling or insufficient net positive suction head available (NPSHa). Noisy control valves or bypass valves usually mean a higher pressure drop with a ...
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