6 Trouble check list
6.1 No water delivered
1.
Priming - casing and suction pipe not completely filled with liquid.
2.
Speed too low.
3.
Discharge head too high. Check total head (particularly friction loss).
4.
Suction lift too high (suction pipe may be too small or long, causing excessive friction loss),
Check with gauge.
5.
Impeller or suction pipe or opening completely plugged.
6.
Wrong direction of rotation.
7.
Air pocket in suction line.
8.
Stuffing box packing worn or water seal plugged allowing leakage of air into pump casing.
9.
Air leak in suction line.
10. Not enough suction head for hot water or volatile liquids. Check carefully as this is a frequent
cause of trouble on such service.
*1
When connected to electric motors, check whether motor wiring is correct and receives full voltage.
When connected to steam turbines, make sure that turbine receives full steam pressure.
6.2 Not enough water delivered
1.
Priming - casing and suction pipe not completely filled with liquid.
2.
Speed too low.
3.
Discharge head higher than anticipated. Check total head (particularly friction loss).
4.
Suction lift too high (suction pipe may be too small or long, causing excessive friction loss).
Check with gauge.
5.
Impeller or suction pipe or opening partially plugged.
6.
Wrong direction of rotation.
7.
Air pocket in suction line.
8.
Stuffing box packing worn - or water seal plugged allowing leakage of air into pump casing.
9.
Air leak in suction line.
10. Not enough suction head for hot water or volatile liquids. Check carefully as this is a frequent
cause of trouble on such service.
11. Foot valve too small.
12. Foot valve not immersed deeply enough (see Figure 8).
13. Mechanical defects: Wearing rings worn. Impeller damaged. Casing gasket defective.
*1
When connected to electric motors, check whether motor wiring is correct and receives full voltage.
When connected to steam turbines, make sure that turbine receives full steam pressure.
6.3
Not enough pressure
1.
Speed too low.
2.
Air in water.
6 Trouble check list
34
3405-3406-3416 Installation, Operation and Maintenance Instructions
