Goulds Pumps 3640 - IOM - Manual (Page 29)

Installation
Piping checklists
General piping checklist
Precautions
CAUTION:
• Never draw piping into place by using force at the flanged connections of the pump. This can
impose dangerous strains on the unit and cause misalignment between the pump and driver. Pipe
strain adversely affects the operation of the pump, which results in physical injury and damage to
the equipment.
• 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.
CAUTION:
Flange loads from the piping system, including those from the thermal expansion of the piping, must not
exceed the limits of the pump. Casing deformation can result in contact with rotating parts, which can
result in excess heat generation, sparks, and premature failure.
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 This helps to prevent:
independently of, and lined up
• Strain on the pump
naturally with, the pump flange. • Misalignment between the pump and the drive unit
See Alignment criteria for pump • Wear on the pump bearings, seal, and shafting
flanges.
Keep the piping as short as pos-
This helps to minimize friction losses.
sible.
Check that only necessary fittings This helps to minimize friction losses.
are used.
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 This prevents air from entering the piping system or
and fittings are airtight.
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 remove the pump.
If the pump handles liquids at
This helps to prevent misalignment due to thermal
elevated temperatures, make expansion of the piping.
sure that the expansion loops and
joints are properly installed.
Make sure that all piping compo-
—
nents, valves and fittings, and
pump branches are clean prior to
assembly.
Make sure that the isolation and
Locate the check valve between the isolation valve and
check valves are installed in the the pump. This will permit inspection of the check valve.
discharge line. The isolation valve is required for regulation of flow, and
for inspection and maintenance of the pump. The check
valve prevents pump or seal damage due to reverse
flow through the pump when the driver is turned off.
Model 3640 Installation, Operation, and Maintenance Manual 27