SPX Johnson Pump CombiPrime V, Инструкция по эксплуатации

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36 Problem solving
CV/EN (1009) 5.3
Table 4: Possible causes of pump failures.
Possible causes
1
Service liquid tank or float de-aerator not filled with liquid
2 Gas or air coming from the liquid
3
Air lock in the suction pipe
4 Air leak in the suction pipe
8
The manometric suction head is too high
9 Suction pipe or suction strainer is blocked
10
Insufficient immersion of foot valve or suction pipe during operation of the pump
11 NPSH available too low
12
Speed too high
13 Speed too low
14
Wrong sense of rotation
15 Pump does not operate at the right duty point
16
Liquid density differs from the calculated liquid density
17 Liquid viscosity differs from the calculated liquid viscosity
18
Pump works when the liquid flow is too low
19 Wrong pump selection
20
Obstruction in impeller or pump housing
21 Obstruction in the piping
22
Wrong installation of the pump unit
23 Pump and motor not well aligned
24
Rotating part running out of true
25 Imbalance in rotating parts (for instance: impeller or coupling)
26
Pump shaft is running out of true
27 Bearings faulty or worn out
28
Wear ring faulty or worn out
29 Damaged impeller
30
Seal faces of the mechanical seal are worn out or damaged
32 Bad mounting of the mechanical seal or of the lip seals
33
Mechanical seal or lip seals not suitable for the operation liquid or operation
circumstances
34 Pump wheel cover not perpendicularly mounted
37
Axial retaining of impeller or pump shaft is defective
38 The bearings have been mounted wrongly
39
Too much or too little bearing lubrication
40 Wrong or polluted lubricant
42
Too high axial force because of worn dorsal blades or excessive inlet pressure
43 Air-inlet valve closed
44
Air-inlet valve opened too much