Goulds Pumps 3996, Installation, Operation And Maintenance Instructions

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TROUBLESHOOTING
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Causes and Corrective Measures . . . . . . . . . . . . . . . . . . . . . . . . . . 45
TROUBLESHOOTING
CAUSES AND CORRECTIVE MEASURES
3996 IOM 9/2010
45
Problem Possible Causes and Corrections
A. No liquid delivered, not enough liquid delivered, or not
enough pressure.
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18, 19, 20.
B. Pump works a while and then quits. 4, 5, 7, 8, 9, 11, 12, 20.
C. Pump takes too much power. 6, 13, 14, 15, 16, 21, 22, 23, 24, 31.
D. Pump is noisy or vibrates. 15, 16, 17, 28, 31.
E. Pump leaks excessively at stuffing box 8, 24, 25, 26, 27.
F. High bearing temperature 15, 16, 17, 29, 30, 31.
G. Stuffing box overheating 8, 24, 25, 26, 27.
Cause Remedy
1 Pump not primed or properly vented.
Check that casing and suction pipe are completely filled
with liquid.
2 Speed too low.
Check whether motor wiring is correct and receives full
voltage or turbine receives full steam pressure.
3 System discharge head too high. Check system head (particularly friction losses).
4 Suction lift too high.
Check NPSH available (suction piping too narrow or long
may cause excessive friction losses). Check with vacuum
or compound gauge.
5 Impeller or piping obstructed. Check for obstructions.
6 Wrong direction of rotation. Check rotation.
7 Air pocket or leak in suction line. Check suction piping for air pockets and/or air leaks.
8
Stuffing box packing or seal worn allowing leakage of air
into pump casing. Check packing or seal and replace as required. Check for
proper lubrication.
9 Not enough suction head for hot or volatile liquids. Increase suction head, consult factory.
10 Foot valve too small. Install correct size foot valve.
11 Foot valve or suction pipe not immersed deep enough.
Consult factory for proper depth. Use baffle to eliminate
vortices.
12 Entrained air or gases in liquid. Consult factory.
7