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Useful Tips
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 the geometric suction 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.
Useful
Tips
for trouble-free operation
8.3
Pump Overloads Motor
Summary of Contents for L Series
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