Liquid source above the pump
Check
Explanation/comment
Checked
Check that an isolation valve is installed in
the suction piping at a distance of at least
two times the pipe diameter from the suc-
tion inlet.
This permits you to close the line during pump inspec-
tion and maintenance.
Do not use the isolation valve to throttle the pump.
Throttling can cause these problems:
•
Loss of priming
•
Excessive temperatures
•
Damage to the pump
•
Voiding the warranty
Make sure that the suction piping is free
from air pockets.
This helps to prevent the occurrence of air and cavita-
tion in the pump inlet.
Check that the piping is level or slopes
downward from the liquid source.
—
Make sure that no part of the suction pip-
ing extends below the suction flange of the
pump.
—
Make sure that the size of the entrance
from the supply is one or two sizes larger
than the suction pipe.
—
Make sure that the suction piping is ade-
quately submerged below the surface of
the liquid source.
This prevents air from entering the pump through a
suction vortex.
Correct
Incorrect
The correct distance between the inlet flange of the
pump and the closest elbow is at least two pipe diame-
ters.
1
2
1.
Enough distance to prevent cavitation
2.
Eccentric reducer with a level top
4.5 Piping checklists
34
Model 3296 EZMAG Installation, Operation, and Maintenance Manual
