Troubleshooting table – Goulds Pumps 3410 - IOM User Manual
Page 43
Troubleshooting Table
Key
Cause
Corrective Measures
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 head too high
Check system head (particularly friction losses).
4
Suction lift too high.
Check NPSH Available (suction piping too small 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 product 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.
13
Impeller clearance too great.
Check for proper clearance.
14
Impeller damaged.
Inspect and replace as required.
15
Rotating parts bind.
Check internal wearing parts for proper clearances.
16
Shaft bent.
Straighten or replace as required
17
Coupling or pump and driver misaligned.
Check alignment and realign if required.
18
Impeller diameter too small.
Consult factory for proper impeller diameter.
19
Improper pressure gauge location.
Check correct position and discharge nozzle or pipe.
20
Casing gasket damaged.
Check gaskets and replace as required.
21
Speed too high.
Check motor winding voltage or steam pressure
received by turbines.
22
Head lower than rating, pumps too
much liquid.
Consult factory. Install throttle valve and cut impeller.
23
Liquid heavier than anticipated.
Check specific gravity and viscosity.
3410 IOM 1/2010
41
5