ITT GOULDS PUMPS 3935, Инструкции по установке, эксплуатации и обслуживанию

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8 Trouble shooting
8.1 Troubleshooting
Problem Possible causes and correction
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, 17, 22, 23
B. Pump works a while then quits 4,5, 7, 8, 9, 11. 12, 22, 23
C. Pump takes too much power 15, 18, 19
D. Pump is noisy or vibrates 15, 16,20,21,23,24
E. Pump leaks excessively at seal housing 8
F. High bearing temperature 23,24,25
Causes and 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 or not 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 small or too long may cause ex-
cessive friction losses). Check with vacuum or compound gauge.
5. Pump 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. Incorrect or damaged seal allowing leakage of air into pump casing or liquid leakage out: inspect
seal or replace as required.
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 baf-
fle 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 clearances.
16. Coupling or pump and driver misaligned: check alignment and realign if required.
17. Improper pressure gauge location: check correct position and discharge nozzle or pipe.
18. Head lower than rating: pumps too much liquid-consult factory. Install throttle valve.
19. Liquid heavier than anticipated: check specific gravity and viscosity.
20. Cavitation: increase NPSH available. Consult factory.
21. Improper bearing lubrication or bearings worn out: inspect and replace as required.
22. Internal recirculation due to damaged diffusers or diffuser O-rings: Replace damaged diffusers
and 0-rings.
23. Diffusers spinning due to insufficient torque on discharge head: Replace damaged diffusers and
reassemble with proper torque on discharge head.
24. Pump not properly secured to base or piping not properly supported: provide for secure bolting to
base, proper base structure and support of pipes.
8 Trouble shooting
Model 3935 Installation, Operation and Maintenance Instructions 31