MIL-HDBK-1164
Table 13
Troubleshooting Checklist for Progressive-Cavity Pumps
Symptom
Possible Cause
No water is delivered.
Broken or disconnected shaft.
Excessive discharge head.
Plugged or nonsubmerged suction.
Pump does not deliver rated
Speed too low.
capacity.
Suction lift excessive.
Suction partially plugged.
Mechanical defect.
Pressure is too low.
Discharge head too high.
Speed too low.
Pressure relief valve set too low.
Mechanical defect.
Pump stops after starting to
Bent column shaft.
operate.
Clogged suction.
6.4.5.3
Operating Precautions
a)
Rotary- and reciprocating-displacement pumps depend on
clearances for efficiency. Keep grit or other abrasive material out of the liquid being
pumped to prevent excessive wear and rapid loss of efficiency and self-priming ability.
b)
A pressure-relief valve that discharges back to the suction side of
the pump is usually provided on the outlet piping. Adjust this valve for a relief pressure
that does not overload the motor. Make sure the check valves seat properly at normal
pressures. Otherwise, loss of efficiency and priming ability result.
c)
Use the manufacturer's manuals to develop a checklist for the
particular rotary- or reciprocating-displacement pump being used.
6.5
Pump Maintenance. Information contained in the following paragraphs is
general and is not intended to replace maintenance procedures provided by the
equipment manufacturer. Additional information on pump maintenance can be found in
the publications listed in pars. 2.1.4, 2.2.37, and 2.2.41.
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