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This is a proprietary document of Kirloskar Brothers Limited, Kirloskarvadi-416308, Dist-Sangli (India)
ISSUE DATE: 17.09.2010 LAST REV. DATE:
Pump rotor locked in standstill position 22 45 46 50
Pump is heating up and seizing 23 24 25 26 27 28 29 30 40 41 42 45 47 48 49 50 54
Bearing temperature increases
19 20 21 22 31 32 33 34 35 36 37 38 39 40 41 42 43 44
45 46 47 48 49 51 54 55 58
Motor will not start 14 22 60
Motor gets hot or burns out 14 22 27 28 40 43 50 55 56 57 58 59 60 61
Motor is difficult to start 14 22 27 28 45 46 50 58 59 60
CHECK POINTS
1. Suction pipe, foot valve choked.
2. Nominal diameter of suction line too small.
3. Suction pipe not sufficiently submerged.
4. Too many bends in the suction line.
5. Clearance around suction inlet not sufficient.
6. Shut off valve in the suction line in unfavorable position.
7. Incorrect layout of suction line (formation of air pockets).
8. Valve in the suction line not fully open.
9. Joints in the suction line not leak-proof.
10. Air leaking through the suction line and stuffing box etc.
11. Suction lift too high.
12. Suction head too low (difference between pressure at suction connection and vapor
pressure too low).
13. Delivery liquid contains too much gas and/or air.
14. Delivery liquid too viscous.
15. Insufficient venting.
16. Number of revolutions too high.
17. Number of revolutions too low.
18. Incorrect direction of rotation (electric motor incorrectly connected, leads of phases on the
terminal block interchanged).
19. Impeller clogged.
20. Impeller damaged.
21. Casing rings worn out.
22. Separation of crystals from the flow of pumping liquid (falling below the temperature
limit/equilibrium temp).
23. Sealing liquid line obstructed.
24. Sealing liquid contaminated.
25. Lantern ring in the stuffing box is not positioned below the sealing liquid Inlet.
26. Sealing liquid omitted.
27. Packing incorrectly fitted.
28. Gland tightened too much/slanted.
29. Packing not suitable for operating conditions.
30. Shaft sleeve worn in the region of the packing.
31. Bearing worn out.
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