Goulds Pumps 3180-86 - IOM - Manual (Page 40)

Check Explanation/comment Checked
If the pump handles liquids at
elevated temperatures, make sure
that the expansion loops and
joints are properly installed.
This helps to prevent misalignment due to linear
expansion of the piping.
Example: Installation for expansion
Correct Incorrect
This illustration shows a correct installation for
expansion:
1
1. Expansion loop/joint
This illustration shows an incorrect installation for
expansion:
Suction-piping checklist
Performance curve reference
CAUTION:
Vary the capacity with the regulating valve in the discharge line. Never throttle the flow from the suction
side. This action can result in decreased performance, unexpected heat generation, and equipment damage.
Suction-piping checks
Check Explanation/comment Checked
Check that the distance between the inlet flange of the
pump and closest flow disruption (elbow, valve,
strainer, or expansion joint) 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.
Suction pipe reducers should have no more than two
pipe diameter changes per reducer.
The suction piping must never have a
smaller diameter than the suction inlet
of the pump.
See the Example sections for
illustrations.
Installation
38 Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual