41
A.0500.501 – IM-TGGS/05.01 EN (03/2013)
Symptom
Cause
Remedy
Not enough capacity Viscosity too low
17
•
Increase pump speed.
Attention!
Do not exceed
maximum speed and check NPSHr.
•
If necessary, install a larger pump.
•
If pump is heated by means of heating jackets or
electrical heating, reduce the heating input.
Axial clearance
18
•
Check axial clearance and correct.
See section 3.21 Maintenance instructions.
Gases come free
19
•
Increase pump speed.
Attention!
Do not exceed
maximum speed and check NPSHr.
•
Install a larger pump
Pump too noisy
Pump speed too high
20
•
Reduce pump speed.
If necessary, install a larger pump.
Cavitation
21
•
Reduce difference between pump and suction
tank level.
•
Increase suction pipe diameter.
•
Reduce length and simplify suction pipe (use as
few elbows and other fittings as possible).
Also see section 3.18 Installation.
Back pressure too high
22
•
Increase pipe diameter.
•
Reduce working pressure.
•
Check accessories (filter, heat exchanger, etc.).
Coupling misalignment
23
•
Check and correct alignment.
Also see section 3.18 Installation.
Vibration of base plate or pipings
24
•
Make baseplate heavier and/or fix base plate/
pipework better.
Ball bearings damaged or worn
25
•
Replace ball bearings.
Pump consumes
too much power or
becomes hot
Pump speed too high
26
•
Reduce pump speed.
If necessary, install a larger pump.
Coupling misalignment
27
•
Check and correct alignment.
Also see section 3.18 Installation.
Viscosity too high
28
•
Increase axial clearance.
See section 3.21 Maintenance instructions.
•
Heat pump.
•
Reduce pump speed.
•
Increase discharge pipe diameter.
Rapid wear
Back pressure too high
29
•
Increase pipe diameter.
•
Reduce working pressure.
•
Check accessories (filter, heat exchanger, etc.)
Solid matter in liquid
30
•
Filter liquid.
Pump runs dry
31
•
Correct liquid supply.
•
Provide level switch or dry running protection.
•
Heat up liquid.
•
Stop or reduce air sucking.
Corrosion
32
•
Change pump materials or application
parameters.
Motor overloading
Back pressure too high
33
•
Increase pipe diameter.
•
Reduce working pressure.
•
Check accessories (filter, heat exchanger, etc.).
Viscosity too high
34
•
Increase axial clearance.
See section 3.21 Maintenance instructions.
•
Heat pump.
•
Reduce pump speed.
•
Increase discharge pipe diameter.
Pump leak
Mechanical seal leaks
35
•
Replace mechanical seal.
