ITT GOULDS PUMPS ICO i-FRAME Installation, Operation And Maintenance Manual page 41

Liquid source above the pump
Check
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.
Make sure that the suction piping is free
from air pockets.
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.
Example: Elbow close to the pump suction inlet
Correct
The correct distance between the inlet flange of the
pump and the closest elbow must be at least five pipe di-
ameters.
1. Enough distance to prevent cavitation
2. Eccentric reducer with a level top
Model ICO i-FRAME, ICOH i-FRAME Installation, Operation, and Maintenance Manual
Explanation/comment
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
This helps to prevent the occurrence of air and cavita-
tion in the pump inlet.
—
—
This prevents air from entering the pump through a
suction vortex.
1
2
Incorrect
4.6 Piping checklists
Checked
39