21
No Discharge
Reduced Capacity
Reduced Pressure
Loss of Prime
Power consumption
excessive, driver runs
hot
Pump Fails Prime
1,2,3,4,5,7,8,9,10,17,18,19,20,
37,49
2,3,4,5,7,8,9,10,11,17,19,20,21,383
9,40,47,49
5,7,8,11,13,18,19,38,39,40,47,49
2,3,4,7,10,11,20,21,22,23,49
6,12,13,17,18,19,24,33,34,35,3637,
38,41,42,43,44
1,4,5,10,20,21,49,50,51
Vibration and noise
Seal: excessive leakage,
short life, seal housing
overheating
Bearings: over heating,
short life, noise
Pump overheating, seizes
Corrosion, erosion,
pitting, oxidation or other
loss of material
2,4,9,10,14,15,17,26,27,28,29
30,31,32,33,34,35,36,39,40,
41,42,43,44,48,49
22,23,25,33,34,35,36,41,44,
45,46
26,27,28,29,30,31,32,33,34,
35,36,41,42,43,44
1,8,9,14,33,34,35,36,41,42,43,
44
7,8,11,14,15,16
1.
Pump not primed
2.
Suction line not filled
3.
Air pocket in suction line
4.
Suction inlet or foot valve obstructed,
insufficiently submerged, or too small
5.
System head higher than pump design head
6.
System head lower than pump design head
7.
Insufficient NPSH
8.
Parallel pump application is incorrect
9.
Suction pressure to vapor pressure below
minimum
10.
Suction lift too high
11.
Excess vapor in pumpage
12.
Specific gravity of pumpage different than
design
13.
Viscosity of pumpage different than design
14.
Operation at below rated capacity
15.
Cavitation
16.
Electrolysis
17.
Impeller obstructed
18.
Wrong rotation direction
19.
Low speed
20.
Air leak into suction line
21.
Air leak through mechanical seal
22.
Seal fluid contaminated, hot or insufficient
23.
Seal fluid system not vented
24.
High speed
25.
Mechanical seal insufficient
26.
Bearing housing excessively cooled
27.
Low oil pressure (oil lube bearings)
28.
Improper or poor lubrication
29.
Lubrication defective
30.
Dirt in lubricant/bearing housing
31.
Moisture in lubricant/bearing housing
32.
Lubricant excess
33.
Pipe strain
34.
Temperature growth
35.
Misalignment
36.
Coupling improperly installed
37.
Impeller installed backwards
38.
Wear rings worn
39.
Impeller damage
40.
Improper balance (after repair)
41.
Bent shaft
42.
Excessive thrust
43.
Rotational element dragging
44.
Worn or incorrectly installed bearings
45.
Mechanical seal not properly set, O-rings
damaged of hardened
46.
Shaft scored at seal
47.
Volute O-ring
48.
Foundation not rigid or settle
49.
Suction line collapsed
50.
Not enough liquid in casing
51.
Suction check valve contaminated or damaged
