Carver Pump RSA - Page 31

RS – Multi-Stage, I-280
Centrifugal Pump 280 – 16.03.EN
25
Table 11. Pumping Unit Troubleshooting - Continued
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
Insufficient
discharge or
flow.
1. Discharge head above shutoff.
2. Air or gases in liquid.
3. Impeller or suction partially clogged.
4. Wrong direction of rotation.
5. Specific gravity or viscosity of liquid is too
high.
6. Incorrect impeller diameter.
1. Check pump rating against actual head
condition.
2. Adjust and/or redesign suction system. Add
liquid to system.
3. Inspect suction and impeller and clean as
necessary.
4. Reverse direction of rotation.
5. Check liquid temperature and adjust as
necessary.
6. Replace impeller or trim impeller to correct
diameter. Consult with Carver Pump before
trimming impeller.
Vibration
excessive.
1. Foundation bolting loose.
2. Coupling halves not properly oriented
relative to each other.
3. Impeller partially blocked.
4. Wrong rotation.
5. Insufficient foundation.
6. Pipe strain.
7. Coupling key to motor or coupling key to
pump is not correct length.
8. Motor improperly balanced.
1. Torque bolting to proper values.
2. Adjust coupling halves system relative to
match marks.
3. Inspect impeller and clean as necessary.
4. Adjust direction of rotation.
5. Stiffen foundation as necessary.
6. Modify piping as necessary.
7. Replace with key of correct length.
8. Balance motor.
Leakage at
casing joints.
1. Tie bolts not sufficiently tightened.
2. O-rings damaged.
1. Release the pressure and tighten the tie
bolts.
2. Replace O-rings.
Oil leak.
1. Loose connection.
2. Defective oil seal.
3. Loose or defective gasket.
1. Tighten connectors.
2. Replace oil seal.
3. Tighten bolting and/or replace gasket.
Bearing
temperature
excessive.
1. Lubrication, insufficient lubrication.
2. Defective ball bearing.
3. Pump/driver shafts are misaligned.
4. Piping causes pump to “warp”.
1. Lubricate according to Section X,
Paragraph A.
2. Replace ball bearing.
3. Check coupling alignment.
4. Ensure piping transmits no stress to pump.
Alter piping layout, if necessary. Realign
pump and driver shafts.