Goulds Pumps 3100 - IOM - Manual (Page 32)

TROUBLESHOOTING
24
3100 IOM 1/97
Table 2
Troubleshooting Pump
Problem/Malfunction Probable Cause Remedy
No Liquid Delivered
Pump not primed.
Reprime pump, check that pump and suction
line are full of liquid.
Suction lift too high. Shorten suction pipe.
Suction line clogged.
Check suction line pressure. If low, locate
and remove obstruction.
Foot valve or suction pipe opening
not submerged enough. Consult factory for proper depth. Use baffle
to eliminate vortices.
Impeller clogged with foreign
material.
Disassemble and remove blockage.
Pump not producing
rated flow or head
Air leak in suction line. Check for leakage and correct.
Impeller partly clogged. Backflush pump to clean impeller.
Insufficient suction head.
Ensure that suction line shutoff valve is fully
open and line is unobstructed. Check suction
pressure.
Wrong rotation. Correct wiring.
Worn or broken impeller. Inspect and replace if necessary.
Pump starts then
stops pumping
Improperly primed pump. Reprime pump.
Air or vapor pockets in suction line.
Rearrange piping as necessary to eliminate
air pockets.
Air leak in suction line. Check for leakage and correct.
Pump is noisy
or vibrates
Partly clogged impeller causing
imbalance.
Disassemble and remove blockage.
Worn motor bearings. Replace defective part as required.
Base not rigid enough.
Tighten hold down bolts of pump and motor
or adjust stilts. Check grout.
Suction or discharge piping not
anchored or properly supported.
Anchor per Hydraulic Institute Standards
recommendations (Edition 14, Centrifugal
pump section).
Pump is cavitating. Increase NPSH available.
Motor requires
excessive power
Head lower than rating; pumps too
much liquid.
Install throttle valve.
Liquid heavier than expected. Check specific gravity and viscosity.
Head higher than rating, capacity
at rating.
Check impeller diameter.
Wrong rotation. Correct wiring.
Rotating parts binding or severely
worn. Check internal wearing parts for proper
clearances.