Goulds Pumps 3298 - IOM - Manual (Page 36)

Installation
Check Explanation/comment Checked
When suction strainers or suction Suction strainers help to prevent
bells are used, check that they are clogging.
at least three times the area of the Mesh holes with a minimum diam-
suction piping. eter of 1/16 in. (1.6 mm) are
recommended.
If more than one pump operates This recommendation helps you
from the same liquid source, to achieve a higher pump perfor-
check that separate suction-piping mance.
lines are used for each pump.
If necessary, make sure that the
—
suction piping includes a drain
valve and that it is correctly in-
stalled.
Liquid source below the pump
Check Explanation/comment Checked
Make sure that the suction piping This helps to prevent the occur-
is free from air pockets. rence of air and cavitation in the
pump inlet.
Check that the suction piping —
slopes upwards from the liquid
source to the pump inlet.
Check that all joints are air-tight.
—
If the pump is not self-priming, Use a foot valve with a diameter
check that a device for priming the that is at least equivalent to the
pump is installed.
diameter of the suction piping.
Liquid source above the pump
Check Explanation/comment Checked
Check that an isolation valve is This permits you to close the line
installed in the suction piping at a during pump inspection and main-
distance of at least two times the tenance.
pipe diameter from the suction Do not use the isolation valve to
inlet. 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 This helps to prevent the occur-
is free from air pockets. rence 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 size of the
—
entrance from the supply is one or
two sizes larger than the suction
pipe.
Make sure that the suction piping
This prevents air from entering the
is adequately submerged below pump through a suction vortex.
the surface of the liquid source.
34 3298 Family Installation, Operation, and Maintenance Manual