2
7
Useful Tips
Useful
Tips
for trouble-free operation
8.3
Pump Overloads Motor
8.4
Abnormal Vibrations of Pumping Equipment
Possible Causes
Solutions
1.-
The pumped liquid has a viscosity or density
different from that for which the pump was
selected.
·
Check and consult the manufacturer.
2.-
There are mechanical defects (moving parts
rubbing against fixed parts).
·
Check and consider a pump repair.
1.-
The pump is not primed.
Possible Causes
Solutions
2.-
Air enters the suction pipe.
·
Check and complete the filling of the system with
liquid.
·
Check and repair damaged ducts and
defective joints.
3.-
The suction lift is too high (insufficient NPSH).
·
Check that NPSHavailable >NPSHrequired
·
Check suction geometric head.
·
Check head losses in the suction pipe (partially
closed valve, foreign bodies).
4.-
The impeller is partially clogged causing
unbalance.
·
Check and clear blockages.
·
Check bearings for damage.
5.-
There are mechanical problems, such as bent
shaft, seized parts.
·
Check and consider repair.
8.5
Pump Breaks Down After Start-up
Possible Causes
Solutions
1.-
Leaks in the suction line.
·
Check and repair damaged ducts and
defective joints.
2.-
The suction height is too high.
·
Check suction height and consult the
manufacturer.
3.-
The foot valve or pipe is not sufficiently
submerged.
·
Check and submerge as necessary.