Liquid source below the pump
Check
Explanation/comment
Checked
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 suction piping slopes up-
wards from the liquid source to the pump
inlet.
—
If the pump is not self-priming, check that a
device for priming the pump is installed.
Use a foot valve with a diameter that is at least equiva-
lent to the diameter of the suction piping.
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 suction piping is ade-
quately submerged below the surface of
the liquid source.
This prevents air from entering the pump through a
suction vortex.
4.1.8.2 Auxiliary-piping checklist
Precautions
NOTICE:
Auxiliary cooling and flush systems must be operating properly to prevent excess heat genera-
tion, sparks, and/or premature failure. Ensure auxiliary piping is installed as specified on the
pump data sheet prior to startup.
4.1.8.3 Final piping checklist
Check
Explanation/comment
Checked
Check that the shaft ro-
tates smoothly.
Rotate the shaft by hand. Make sure there is no rubbing that can lead to excess
heat generation or sparks.
If pipe strain exists, then correct the piping.
4.1 Pre-installation
Model Trash Hog II Installation, Operation, and Maintenance Manual
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