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TROUBLESHOOTING
Symptom
No discharge
Reduced capacity
Reduced pressure
Loss of prime
Power consumption excessive,
drive runs hot
Vibration and noise
Seal: excessive leakage, short life,
seal housing overheating
Bearings: overheating, short life, noise
Pump overheating, seizes
Corrosion, erosion, pitting, oxidation
or other loss of material
Pump not primed
1
Suction line not filled
2
Air pocket in suction line
3
4
Suction inlet or foot valve obstructed, insufficiently
submerged, or too small
System head higher than pump design head
5
6
System head lower than pump design head
Insufficient NPSH
7
Parallel pump application is incorrect
8
9
Suction pressure to vapor pressure below minimum
Suction lift too high
10
Excess vapor in pumpage
11
Specific gravity of pumpage different than design
12
Viscosity of pumpage different than design
13
Operation at below-rated capacity
14
Cavitation
15
Electrolysis
16
Impeller obstructed with foreign material
17
Rotation direction wrong
18
Low speed
19
Air leak into suction line
20
Air leak through mechanical seal
21
Seal fluid contaminated, hot or insufficient
22
Seal fluid system not vented
23
High speed
24
Possible Causes
1
2
3
4
5
7
8
9 10 17 18 19 20 37
2
3
4
5
7
8
9 10 11 17 19 20 21 38 39 40 47
5
7
8 11 13 18 19 38 39 40 47
2
3
4
7 10 11 20 21 22 23
6 12 13 17 18 19 24
33 34
2
4
9 10 14 15 17
26 27 28
22 23 25
33 34
35 36
41 44 45 46
26 27 28
29
30
31 32 33 34
1
8
9 14 33 34 35 36 41 42 43 44
7
8 11 14 15 16
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
35 36 37 38 41 42 43 44
29
30
31 32 33
34
35 36
35
36 41 42 43 44
Mechanical seal insufficient
Bearing housing excessively cooled
Low oil pressure (oil lube bearings)
Improper or poor lubrication
Lubrication defective
Dirt in lubrication/bearings
Moisture in lubricant/bearing housing
Lubricant excess
Pipe strain
Temperature growth
Misalignment
Coupling improperly installed
Impeller installed backwards
Worn wear rings
Impeller damage
Improper balance (after repair)
Bent shaft
Excessive thrust
Rotational element dragging
Worn or incorrectly installed bearings
Mechanical seal not properly set, O-rings damaged
or hardened
Shaft scored at seal
Volute O-ring
Foundation not rigid or settled
39 40 41 42 43 44 48
13
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