Installation
Model API 3171 Installation, Operation, and Maintenance Manual
27
Check
Explanation/comment
Checked
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
becomes hard.
• The hold-down bolts for the
pump and the driver are
tightened.
—
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 expan-
sion of the piping.
Make sure that all piping compo-
nents, valves and fittings, and
pump branches are clean prior to
assembly.
—
Make sure that the isolation and
check valves are installed in the
discharge line.
Locate the check valve between the isolation valve and
the pump. This will permit inspection of the check valve.
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.
Use cushioning devices.
This protects the pump from surges and water hammer
if quick-closing valves are installed in the system.
Alignment criteria for pump flanges
Type
Criteria
Axial
The flange gasket thickness is ±0.8 mm | 0.03 in.
Parallel
Align the flange to be within 0.025 mm/mm to 0.8 mm/mm 0.001 in./in. to
0.03 in./in. of the flange diameter.
Concentric
You can easily install the flange bolts by hand.
Suction piping for optional dry pit, outside tank mount, and tailpipe applications
Checklist
Check
Explanation/comment
Chec
ked
Install an elbow at the pump.
Whenever possible, perform these actions:
• Use long radius elbows.
• Move the elbow further from the suction.
• Eliminate unneeded elbows.
Make sure the suction piping is
a larger diameter than the
pump suction.
—
Install separate suction lines
when more than one pump is
operating from the same source
of supply.
—
Make sure that the suction pip-
ing contains no air pockets.
—
Make sure that the suction pip-
ing slopes upwards toward the
pump.
—
Make sure that all joints are air
tight.
—
Provide a method to prime the
pump.
For outside tank mount and dry pit applications, allow the fluid
level inside the tank or pit to rise above the casing level.
In tailpipe applications, submerge the casing before you start the
pump.
Summary of Contents for Goulds Pumps API 3171
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