
10 6.Operating Problems ED.2011/02
6. Operating Problems
The following table provides solutions to problems that might arise during pump operation. The pump is assumed to have been
properly installed and correctly selected for the application. Please contact INOXPA if technical assistance is required.
Operating Problems Probable causes
Overheating. 1, 2, 3, 4, 5, 6.
Fall in capacity / pressure. 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.
Vibrations in the pump and pipes. 6, 12, 17, 18.
Short lifetime of the hose. 1, 2, 3, 6, 19, 20, 21, 22.
Stretching of the hose inside the pump. 2, 23, 24, 25.
The pump will not start up. 26, 27, 28.
Probable causes Solutions
1 Use of non-original lubricant. Use special INOXPA lubricant.
2 Insufficient amount of grease. Grease correctly.
3 Fluid temperature too high. Reduce the pump temperature.
4 Poor suction. Check that there are no obstructions.
5 Hose is squeezed excessively. Check that the shaft of the rollers is assembled in the correct
position.
6 Pump speed is too high. Reduce the pump speed.
7 Suction or delivery valve closed. Open the valves.
8 Hose is insufficiently squeezed. Check that the shaft of the rollers is assembled in the correct position.
9 Rupture of the hose (the product leaks into the
machinery). Change the hose.
10 Partial obstruction of the suction pipe. Clean the pipes.
11 Lack of product in the suction tank. Fill the tank.
12 Suction pipe section too narrow. Increase section / reduce pump pressure.
13 Suction length too long. Shorten the suction pipe.
14 Product viscosity is too high.
Reduce viscosity.
Increase the tube section.
Check that the pump is appropriate.
15 Air is entering through the suction connections. Tighten the flange seals and fittings.
16 Strong pulsations during suction. Install a stilling basin.
Re-analyse the application (speed, etc.)
17 The pieps are not anchored correctly. Fix the pipes.
18 Strong pulsations in the pump. Install delivery and/or suction pulse dampers.
19 Chemical corrosion. Check the compatibility of the tube both with the fluid being
pumped and the cleaning product.
20 Operating pressure too high. Reduce the pump speed.
Increase the pipe section.
21 Abnormally high temperature. Check that the shaft of the rollers is assembled in the correct position.
22 Cavitation. Re-analyse suction conditions.
23 High suction pressure (>3 bar). Reduce suction pressure.
24 The pipe is filled with sediment. Clean the pipe.
25 Clamps insufficiently tightened. Tighten clamps.
26 Operating equipment torque insufficient. Increase operating power.
27 Frequency converter torque insufficient.
Increase torque.
Check that there is sufficient power supply.
Do not operate below a frequency of 12 Hz.
The motor will start up at less than 12 Hz.
28 Blocked pump. Check that there are no blockages in the pump.
If the problems persist, stop using the pump immediately. Contact the pump manufacturer or their representative.