Goulds Pumps 3296M - IOM - Manual (Page 29)

3296 M Group 6/05
25
Table 6
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 line clogged.
Check suction line pressure. If low,
locate and remove obstructions.
Impeller clogged with foreign material. Disassemble and remove blockage.
Magnet de-coupling
Shut down. Check temperature and
viscosity of pumpage. Check magnets
with breakaway torque test.
Pump not
producing rated
flow or head
Air leak in suction line Check for leakage and correct.
Impeller partly clogged Back flush pump to clean impeller
Worn impeller rings Replace defective part as required
Insufficient suction head
Ensure that suction line shutoff valve is
fully open and line is unobstructed.
Check suction pressure
Worn or broken impeller Inspect and replace if necessary
Pump starts then
stops pumping
Improperly primed pump Reprime pump
Air leak in suction line Check for leakage and correct
Magnet de-coupling
Shut down. Check temperature and
viscosity of pumpage. Check magnets
with breakaway torque test.
Air or vapor pockets in suction line
Rearrange piping as necessary, to
eliminate air pockets
Bearings run hot
Improper lubrication Check lubricant for suitability and level
Lube cooling Check cooling system
Improper alignment Check pump alignment
Pump is noisy or
vibrates
Improper pump/driver alignment Align shafts
Partly clogged impeller causing
imbalance
Disassemble and remove blockage
Broken or bent impeller or shaft Replace as required
Base not rigid enough
Tighten hold down bolts of pump and
motor or adjust stilts. Check grout.
Worn bearings Replace
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.