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.
This helps to prevent:
•
Strain on the pump
•
Misalignment between the pump and the drive unit
•
Wear on the pump bearings, seal, and shafting
Keep the piping as straight as possi-
ble. Avoid unnecessary bends. Use
45° or long radius 90° fittings where
necessary.
This helps to minimize friction losses.
Check that only necessary fittings are
used.
This helps to minimize friction losses.
Make sure that the inside diameters
match properly when you use flange
joints.
—
Do not connect the piping to the
pump until:
•
The grout for the baseplate or
sub-base becomes hard.
•
The hold-down bolts for the
pump are tightened.
—
Make sure that all the piping joints
and fittings are airtight.
This prevents air from entering the piping system or leaks that
occur during operation.
If the pump handles corrosive fluids,
make sure that the piping allows you
to flush out the liquid before you re-
move the pump.
elevated temperatures, make sure
that the expansion loops and joints
are properly installed.
This helps to prevent misalignment due to thermal expansion
of the piping.
Make sure that all piping compo-
nents, valves and fittings, and pump
branches are clean prior to assembly.
—
4.5.2 Suction piping checklist
The sizing and installation of the suction piping is extremely important. It must be selected and installed
so that pressure losses are minimized and sufficient liquid flows into the pump when it is started and op-
erated. Many NPSH problems can be directly attributed to improper suction piping systems.
CAUTION:
•
Flange loads from the piping system, including those from the thermal expansion of the
piping, must not exceed the limits of the pump. Deformation can result in contact with ro-
tating parts, which can result in excess heat generation, sparks, and premature failure.
4.5 Piping checklists
Model 3409 Installation, Operation, and Maintenance Manual
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