37
7 TROUBLESHOOTING
Consulting tab.12 and tab.13 can often help to solve troubles or incorrect operation. If the problem persists, please consult us.
Inconveniente
Lista delle cause
The motor does not start and there is no noise
1
The motor does not start but humming noise is heard
2-3-4-5-23
Automatic cut off just after starting
3-6-7-8-9-23
Absorbed power is too high
9-10-11-12-21-22-23
The pump does not produce vacuum
11-13-14-21
The pump produces insufficient vacuum
14-15-16-17-18-19-21-25
The pump makes a strange or loud noise
5-6-9-10-12-20-23
Leakage of liquid from the pump
18-19
The vibrations are too high
5-8-9-10-11-12-20-23-24
Tab 12
Cause
Remedies
1
At least 2 of the electric connections have been cut
off
Check fuses, terminal boards and connection cables and, if
required, replace them
2
At least 1 of the electric connections has been cut off Vedi punto 1 - See point 1
3
The pump is locked
- Clean internal chamber of the pump
- Check clearance of the impeller and, if required, adjust it
4
Faulty impeller
Replace the impeller
5
Faulty bearing
Replace bearing
6
Faulty motor
Check the motor
7
Motor overload
Reduce the service liquid flow rate
8
Too high discharge counter pressure
- Reduce counter pressure
- Check if anything is clogging the discharge piping
9
Too high quantity of liquid entrained with the gas
Reduce the quantity of entrained liquid
10
Scale or other kind of deposits
Decalcify and/or clean the pump
11
Wrong direction of rotation
Change direction of rotation
12
Service liquid flow rate too high
Reduce service liquid flow rate
13
Service liquid is missing
Check the in-feed circuit for service liquid
14
Air leakage in the system
Check pipes seals
15
The pump is too small
Use a larger size pump
16
Insufficient service liquid flow rate
Increase service liquid flow rate
17
Service liquid temperature too high
Cool the service liquid
18
Faulty mechanical seal
Replace the seal
19
Internal erosion/corrosion
Replace damaged components using proper materials
20
Cavitation
- Install VGB valve
- Cool the service liquid
- Increase absolute suction pressure
21
Faulty instruments of measure
Check the instrumentation
22
Stuffing box gland is too tight (only for 30-40 size)
Release pressure exercised by stuffing box gland
23
Ice formation into the pump
Heat the system before starting it
24
Coupling pump-motor
Check joints, sheaves, V-belts and their alignment
25
Heat exchanger inefficient
Check exchanger tubes fouling, flow rate and coolant
temperature
Tab 13
Summary of Contents for KRVS
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