Pompetravaini TRSK 2002/1, Operating Manual, Page: 24 / 32

Operating manual liquid ring vacuum pumps TRVK - TRSK
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14 - TROUBLE SHOOTING: PROBLEMS, CAUSES AND SOLUTIONS
Consult the following tab. 4 when problems are experienced, if solutions are not found in this chart or should there be any
doubts, do not hesitate to contact POMPETRAVAINI or your local representative.
Tab. 4 - LIST OF PROBLEMS
PROBLEM LIST OF POSSIBLE CAUSES
Pump does not create or the vacuum is too low 1
– 2 – 3 – 4 – 9 – 11 – 18 – 19 – 22 – 23 – 24 – 25 – 26
Excessive noise 1
– 4 – 5 – 6 – 7 – 10 – 24 – 26 – 27
High power consumption 1
– 5 – 6 – 8 – 9 – 15 – 24 – 25 – 26 – 27
Vibration 5
– 6 – 7 – 8 – 10 – 12 – 13 – 24 – 26 – 27
Mechanical seal leaking 11
– 14
Pump looses liquid 11
– 19 – 23
Bearing failure 5
– 6 – 7 – 27
I Pump does not start 1
– 6 – 20 – 21 – 26
J Shaft partially or totally locked 6
– 10 – 15 – 16 – 21 – 26
Cavitation 3
– 4 – 8 – 9 – 17 – 24
CAUSES SOLUTIONS
1 Defective motor or wired wrong
Check the voltage, the frequency, motor type, power consumption,
rotation, wiring connections, phase consistency
2 Leakage in suction piping Repair piping; check valves for leakage
3 Service liquid high temperature
Lower the service liquid temperature;
check the level of the service liquid; adjust the cooling liquid flow;
adjust the radiator thermostat to lower temperature setting
4 Low service liquid flow Increase the service liquid flow
5 Coupling misalignment Re-align the coupling and the pump/motor assembly
6 Faulty bearing Replace the bearing
7 Cavitation
Open the anti-cavitation valve or set the relief valve to a lower
vacuum
8 High service liquid flow Reduce the service liquid flow; adjust the by-pass valve
9 High back pressure
Check the discharge line for obstructions or high friction losses;
reduce the back-pressure to maximum 0.1 bar
10 Wrong pump/motor assembly
Verify that the base surface is level and that all pump feet are
resting on the surface, add spacers if required
11 Mechanical seal failure Change the mechanical seal
12 Wrong pump mounting Remount the pump
13 Piping weight resting on pump Support the piping with hangers or other means
14 Inadequate seal lubrication Check flushing liquid temperature, flow and pressure
15 Mineral deposits from hard water Clean the pump
16 Foreign particles in pump Disassemble the pump to remove the foreign objects
17 Low suction pressure
Open the vacuum regulating valve and/or the anti-cavitation valve
(vacuum relief valve)
18 Wrong pump rotation Reverse the rotation
19 Bad gaskets Replace the defective gaskets
20 Wrong motor connections
Check the electrical connections (connectors, fuses, breakers)
and the power supply line
21 Pump seized Disassemble and repair the pump
22 Pump undersized Select a pump with higher capacity
23 Pump worn-out Disassemble and repair the pump
24 Excessive liquid flow through suction line
Reduce the liquid flow through the pump suction; install a
centrifugal separator (cyclone) before the pump
25 Instrumentation out of calibration Check the working characteristics, replace if required
26 Insufficient tension for the belt Reset the correct tension of the belt
27 Excessive tension for the belt Reset the correct tension of the belt