Goulds Pumps CV 3196 i-FRAME - IOM - Manual (Page 38)

Check Explanation/comment Checked
Check that the eccentric reducer at the suction
flange of the pump has the following properties:
• Sloping side down
• Horizontal side at the top
See the example illustrations.
If suction strainers or suction bells are used, check
that they are at least three times the area of the
suction piping.
Suction strainers help to prevent
clogging.
Mesh holes with a minimum diameter
of 1/16 in. (1.6 mm) are recommended.
If more than one pump operates from the same
liquid source, check that separate suction-piping
lines are used for each pump.
This recommendation helps you to
achieve a higher pump performance.
If necessary, make sure that the suction piping
includes a drain valve and that it is correctly
installed.
—
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 cavitation in the pump inlet.
Check that the suction piping slopes upwards
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 equivalent 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 suction
inlet.
This permits you to close the line during
pump inspection 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 cavitation 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 piping
extends below the suction flange of the
pump.
—
Make sure that the suction piping is
adequately submerged below the surface of
the liquid source.
This prevents air from entering the pump
through a suction vortex.
Installation
36 Model CV 3196 i-FRAME Installation, Operation, and Maintenance Manual