MDX [en-US]
52
Troubleshooting Table 2 / 2
Pump delivers insufficient flow rate
Motor is overl
oad
ed
Excessive dis
charge pressur
e
Increase in b
e
arin
g temperat
ure
Leakage at the pump
Excessive leakage at the shaft seal
Vibratio
n duri
n
g pump o
per
ati
on
Excessive tem
peratur
e rise in
pump
Cause
Remedy
For further information consult the GIW Technical
Series at http://giwindustries.com
■
■ ■ ■
Insufficient suction head (NPSH available )
Check sump level. Raise if necessary.
Fully open any valves in the suction line.
Check suction line friction loss calculations. Alter
design if necessary.
Contact your GIW / KSB representative for further
advice.
■
Density or viscosity of the fluid pumped is higher
than expected.
Adjustment may be needed to system design and/or
pump operating conditions.
■ ■
Speed is too high.
Reduce the speed.
■ ■ ■
Worn parts.
Loose bolts, seals or gaskets.
Check for worn parts. Replace as needed.
Tighten the bolts and/or fit new seals and gaskets if
needed.
■
Incorrect packing material or adjustment.
Incorrect seal water pressure (too high or low).
Correct adjustment. Replace parts as needed.
(See GIW Tech Article on this subject.)
■ ■ ■ The unit is misaligned.
Check the coupling. Re-align if required.
■
■
Bearing failure.
Replace bearings. Check lubricant for contamination.
Inspect and repair bearing seals as needed.
Contact a GIW service center for factory rebuild
services.
■
Insufficient or excessive quantity of lubricant or
unsuitable lubricant.
Correct
according
to
maintenance
manual
recommendations.
■
Insulating or hot ambient conditions
Remove insulation and/or dirt from bearing assembly.
Improve ventilation around pump.
■
Operating voltage is too low.
Increase the voltage.
Summary of Contents for GIW MDX
Page 53: ...MDX en US 53 14 Notes...
