Table of Contents
Advertisement
ISO PRO Centrifugal Pump
Section 8..................................................................Pump Troubleshooting
3. DESCRIPTION OF CHECK POINTS:
1
Suction pipe, foot valve choked.
2
Nominal diameter of suction line too small.
3
Suction pipe not sufficiently submerged.
4
Too many bends in the suction line.
5
Clearance around suction inlet not sufficient.
Shut
off
valve
6
unfavourable position.
Incorrect layout of suction line (formation of air
7
pockets).
8
Valve in the suction line not fully open.
9
Joints in the suction line not leak-proof.
Air leaking through the suction line and stuffing box
10
etc.
11 Suction lift too high.
Suction head too low (difference
12
pressure at suction connection and vapour pressure
too low).
13 Delivery liquid contains too much gas and/or air. 44 Elastic element of coupling worn.
14 Delivery liquid too viscous.
15 Insufficient venting.
16 Number of revolutions too high.
17 Number of revolutions too low.
Incorrect direction of rotation (electric motor
18
incorrectly connected, leads of phases on the
terminal block interchanged).
19 Impeller clogged.
20 Impeller damaged.
21 Casing rings worn out.
Separation
of
crystals
22
pumping liquid (falling below the temperature limit/
equilibrium temp).
23 Sealing liquid line obstructed.
24 Sealing liquid contaminated.
Lantern
ring
in the
25
positioned below the sealing liquid inlet.
26 Sealing liquid omitted.
27 Packing incorrectly fitted.
28 Gland tightened too much/slanted.
29 Packing not suitable for operating conditions.
30 Shaft sleeve worn in the region of the packing.
31 Bearing worn out.
in
the
suction
line
between
from
the
flow
stuffing box
is not
32 Specified oil level not maintained.
33 Insufficient lubrication of bearings.
34 Bearings over-lubricated.
35 Oil/Grease quality unsuitable.
36 Bearing incorrectly fitted.
in
Axial stress on bearings (no axial clearance for
37
rotor).
38 Bearings dirty.
39 Bearings rusty (corroded).
Axial thrust too great because of worn casing
40
rings, relief holes obstructed.
Insufficient cooling water supply to stuffing box
41
cooling.
Sediment in the cooling water chamber of the
42
stuffing box cooling.
43 Alignment of coupling faulty or coupling loose.
45 Pump casing under stress.
46 Pipeline under stress.
47 Shaft runs untrue.
48 Shaft bent.
49 Rotor parts insufficiently balanced.
50 Rotor parts touching the casing.
51 Vibration of pipe work.
52 Non-return valve gets caught.
of
53 Contaminated delivery liquid.
54 Obstruction in delivery line.
55 Delivery flow too great.
56 Pump unsuitable for parallel operation.
57 Type of pump unsuitable.
Incorrect choice of pump for existing operating
58
conditions.
59 Voltage too low/power supply overloaded.
60 Short circuit in the motor.
61 Setting of starter of motor too high.
62 Temperature delivery liquid too high.
38
Advertisement
Table of Contents
