Goulds Pumps 3796 i-FRAME - IOM - Manual (Page 31)

Example: Installation for expansion
Correct Incorrect
1
1. Expansion loop/joint
Suction-piping checklist
Performance curve reference
Suction-piping checks
Check Explanation/comment Checked
Check that the distance between the inlet flange of
the pump and the closest elbow is at least five pipe
diameters.
This minimizes the risk of cavitation in
the suction inlet of the pump due to
turbulence.
See the Example sections for
illustrations.
Check that elbows in general do not have sharp
bends.
See the Example sections for
illustrations.
Check that the suction piping is one or two sizes
larger than the suction inlet of the pump.
Install an eccentric reducer between the pump inlet
and the suction piping.
The suction piping must never have a
smaller diameter than the suction inlet of
the pump.
See the Example sections for
illustrations.
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.
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Installation (Continued)
Model 3796 i-FRAME Installation, Operation, and Maintenance Manual 29