KSB WK 100, Руководство пользователя

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WK
8. Mount coupling hub on the shaft with the aid of a pusher
device.
9. Align pump at the coupling (see section 8.3, ‘‘Coupling
Alignment’’).
10. Pull fixing bolts tight on pump feet (see section 8.5, ‘‘Final
Alignment’’).
11. Pack the stuffing boxes in accordance with section 12.3.1
‘‘Assembly of Shaft Seal’’.
12. Connect all the pipelines to the pump.
13. Carry out a final coupling alignment check in accordance
with section 8.5 ‘‘Final Alignment’’.
14. Fill the bearing housing (350) with oil (see sections 1.3
‘‘Bearings’’ and 1.4 ‘‘Lubrication’’).
15. Open isolating valve in suction line fully.
16. Start up the pump (see section 10 ‘‘Commissioning’’).
13. Operating Troubles, Causes and
Remedies
Caution : Before remedying operating troubles, check all
measuring instruments used for reliability and accuracy.
13.1 Operating Troubles Cause and suggested remedy see
section 13.2 & 13.3
1. Pump fails to deliver liquid 1, 2, 3, 4, 5, 6, 8, 12,
13
2. Pump delivers insufficient 1, 2, 3, 4, 5, 8, 12, 13,
liquid 19, 20, 21
3. Total head is too low 3, 4, 5, 7, 8, 10, 12, 19,
20, 21
4. Sudden interruption of 1, 2, 3, 4, 9, 11, 13
delivery shortly after start-up
5. Absorbed power is 6, 7, 9, 10, 17, 19
excessively high
6. Excessive leakage at 14, 16, 18, 22, 23, 24,
stuffing box 28, 29
7. Life of packing is too short 14, 16, 18, 22, 23, 24,
25, 26, 27, 28, 29
8. Pump vibrates or runs noisily 2, 3, 4, 11, 13, 14, 15,
16, 17, 18, 20, 24, 32,
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9. Life of bearing is too short 14, 16, 17, 25, 31, 32,
33, 34
10. Excessively high temperature 1, 3, 4, 7, 9, 11, 13, 14,
inside the pump. 16,
Rotor fouls the casing or 18, 19, 20, 24, 30, 32
seizes
11. Too high a rate of leakage 14, 16, 18, 24, 25, 35,
liquid at the mechanical seal 36, 37, 38, 39, 40
or too short a mechanical
seal life
13.2 Cause of Damage (the numbers listed below
correspond with the code numbers of section 13.1).
Faults at the Suction End
1. Pump not properly vented, air pocket in suction line,
vapour bubble at suction end, lines not properly vented.
2. Pump or suction line incompletely primed with fluid.
3. Insufficient pressure differential between suction pressure
and vapour pressure, NPSH required is not attained
(observe rate of pressure decrease).
4. Mouth of suction line too close to surface of liquid level in
the suction vessel, or liquid level in vessel too low.
General Faults in the Installation
5. Rotational speed to low, or rate or minimum flow through
by-pass excessive.
6. Rotational speed too high.
7. Reverse rotation.
8. Total head required for the system is higher than total
head generated by the pump at duty point (back pressure
too high).
9. Total head required for the system is lower than total head
generated by the pump (pump operates beyond the
performance limit curve).
10. Specific gravity of fluid pumped is different from figure
specified originally (different operating temperature).
11. Operation at very low rate of flow (fault in minimum flow
device, rate of minimum flow is too low).
12. Pumps cannot possibly operate in parallel under these
conditions.
Mechanical Faults
13. Foreign bodies lodged in impeller.
14. Pump misaligned or incorrectly aligned, or shifting of
foundation.
15. Resonance, or interference by other machines via the
foundation.
16. Shaft is bent.
17. Rotating elements foul the stationary elements, pump runs
very rough.
18. Bearings badly worn.
19. Casing wearing rings badly worn.
20. Impeller damaged or disintegrated.
21. Fault casing seal (excessive internal loss at throttling gap,
rotor clearances exceeded due to wear), so that an
excessive loss arises or water leaks through the casing
partition. Water leaks out of metallic sealing face to
atmosphere.
22. Shaft or shaft protection sleeves worn or scored, O-ring
damaged.
23. Stuffing box badly packed. Packing material of unsuitable
quality.
24. Shaft chatters because bearings are worn or because
shaft is misaligned.
25. Rotor vibrates.
26. Stuffing box gland is tightened excessively, no fluid
available to lubricate the packing.
27. Defect in cooling liquid supply to water-cooled stuffing
box gland.
28. Excessive clearance gap between stuffing box gland and
shaft protection sleeve. Packing is squeezed into gap
beneath the gland.
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