MDX [en-US]
51
12
Troubleshooting
Troubleshooting Table 1 / 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
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■ ■ ■ ■ ■
Blocked discharge or suction piping
WARNING: Pump must not be run with
blocked piping. Danger of explosion due to
heating of liquid and overpressure of pump.
Remove blockage or open valve.
If piping cannot be unblocked immediately, pump must
be shut down without delay.
■ ■
System head is higher than expected.
Check for unexpected clogging, collapsed line or
partially closed valve.
Check system calculations. Adjustment may be
needed to system design and/or pump operating
conditions.
■
■ ■
Low flow operation.
Increase flowrate. In general, operation below 30% of
best efficiency flowrate is not recommended.
■
■
System head is lower than expected, leading to
excessive flowrate.
Adjustment may be needed to system design and/or
pump operating conditions.
Contact your GIW / KSB representative for further
advice.
■
■ ■
Pump and piping are not completely vented or
primed.
Vent and / or prime.
■
■
Excess air entrained in liquid.
Improve sump design and venting to prevent air from
reaching pump. Consider a froth pump design if air
cannot be avoided.
■
■ ■ ■
Partial clogging of impeller.
Remove blockage. Be aware that blockage may drain
back into sump after shutdown.
■ ■ ■
Resonance vibrations in the piping.
Check pipeline connections and pump mounting.
If required, reduce the distances between, or
otherwise modify pipe supports.
Summary of Contents for GIW MDX
Page 53: ...MDX en US 53 14 Notes...
