NOTICE:
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.
Piping guidelines
Guidelines for piping are given in the Hydraulic Institute Standards available from the Hydraulic Institute
at 9 Sylvan Way, Parsippany, NJ 07054-3802. You must review this document before you install the
pump.
Checklist
Check
Explanation/comment
Checked
Check that all piping is supported in-
dependently of, and lined up naturally
with, the pump flange.
•
Strain on the pump
•
Misalignment between the pump and the drive unit
Keep the piping as short as possible. This helps to minimize friction losses.
Check that only necessary fittings are
used.
This helps to minimize friction losses.
Do not connect the piping to the
pump until:
•
The grout for the baseplate or
sub-base becomes hard.
•
The grout for the pit cover be-
comes hard.
•
The hold-down bolts for the
pump and the driver are tight-
ened.
—
Make sure that all piping compo-
nents, valves and fittings, and pump
branches are clean prior to assembly.
—
Example: Piping installation with a vent line
Vent Line
4.5 Piping checklists
32
Model 3355 Installation, Operation, and Maintenance Manual
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