ITT HT 3196 i-FRAME Installation, Operation And Maintenance Manual page 39

Check
Check that the eccentric reducer at the suction
flange of the pump has the following properties:
• Sloping side down
• Horizontal side at the top
If suction strainers or suction bells are used, check
that they are at least three times the area of the
suction piping.
If more than one pump operates from the same
liquid source, check that separate suction-piping
lines are used for each pump.
If necessary, make sure that the suction piping
includes a drain valve and that it is correctly
installed.
Liquid source below the pump
Check
Make sure that the suction piping is free from
air pockets.
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.
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 suction
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 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.
Model HT 3196 i-FRAME Installation, Operation, and Maintenance Manual
Explanation/comment
See the example illustrations.
Suction strainers help to prevent
clogging.
Mesh holes with a minimum diameter
of 1/16 in. (1.6 mm) are recommended.
This recommendation helps you to
achieve a higher pump performance.
—
Explanation/comment
This helps to prevent the occurrence of air
and cavitation in the pump inlet.
—
Use a foot valve with a diameter that is at
least equivalent to the diameter of the suction
piping.
Explanation/comment
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
This helps to prevent the occurrence of air
and cavitation in the pump inlet.
—
—
This prevents air from entering the pump
through a suction vortex.
Installation
Checked
Checked
Checked
37