Troubleshooting - Feed Water Pump - FULTON VSRT Series Installation, Operation And Maintenance Manual

Fulton Ltd
8.2 TROUBLESHOOTING
Problem
1. FEEDWATER PUMP
Pump will not run
2. Motor starter
overload, trips out
immediately when
supply is switched
on.
3. Motor contactor
overload trips out
occasionally.
4. Pump capacity not
constant.
5. Pump runs but gives
no water.
6. Pump runs
backwards when
switched off.
7. Leakage in shaft
seal.
VSRT-IOMM-2019-1
Cause
1. Supply failure.
2. Fuses/Circuit Breakers are
blown.
3. Motor contactor overload has
tripped out.
4. Contactors not making
5. Control circuit is defective.
6. Motor is defective.
1. One fuse/automatic circuit
breaker is blown.
2. Contacts in motor contactor
overload are faulty.
3. Cable connection is loose or
faulty.
4. Motor winding is defective.
5. Pump blocked.
6. Overload setting too low.
1. Overload setting is too low.
2. Low voltage at peak times.
1. Pump inlet pressure is too low
(cavitation).
2. Suction pipe/pump partly
blocked.
3. Pump draws in air.
1. Suction pipe/pump blocked.
2. Foot or non-return valve
blocked in closed position.
3. Leakage in suction pipe.
4. Air in suction pipe or pump.
5. Pump rotates in the wrong
direction.
6. Boiler feedwater non-return
valve letting water passed the
valve seat.
7. Vapour locking of pump.
1. Leakage in suction pipe.
2. Foot or non-return valve is
defective.
1. Shaft seal is defective.
TROUBLESHOOTING - 8
FEEDWATER PUMP
Remedy
Connect the electricity supply.
Replace fuses/Circuit Breakers.
Reactivate the motor protection.
Check, the coil is faulty or wiring loose.
Repair the control circuit.
Replace the motor.
Replace the fuse, reset the circuit breaker.
Replace motor starter contacts.
Tighten or replace the cable connection.
Replace the motor.
Remove the blockage.
Set the motor starter correctly.
Set the overload correctly.
Check the electricity supply.
Check the suction conditions.
Clean the pump or suction pipe.
Check the suction conditions.
Clean the pump or suction pipe.
Repair the foot or non-return valve.
Repair the suction pipe.
Check the suction conditions.
Change the direction of rotation of the motor.
Check and clean boiler feedwater non-return valve, ensure
it is seating (normally and not allowing water passed.
accompanied by banging in the feedwater tank).
Allow system to cool down, check steam traps of pump
and check to be sure return lines are not insulated. Check
return tank temperature, if it is above 82 °C vapour locking
of the pump will occur. Inspect check valves. Clean
and replace as needed. Replace pump with multi-stage
centrifugal pump able to cope with 121 °C.
Repair the suction pipe.
Repair the foot or non-return valve.
Replace the shaft seal.
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