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15
Piping:
IMPORTANT:
All piping connections must be made with the pipe in a free supported state, and without the need to apply
vertical or side pressure to obtain alignment of the piping with pump flange.
All piping should be independently supported near the pump so that pipe strain will not be transmitted to the pump
casing. The weight of the piping and of the contained liquid must be considered in support design.
The suction and discharge piping should be one or two sizes larger than the pump flange sizes, especially where the
piping is of considerable length. Any flexible joints installed in the piping must be equipped with tension rods to
absorb piping axial thrust.
The suction pipe must be air tight and sloped upward to the pump flange to avoid air pockets that will impair
satisfactory pump operation. The discharge pipe should be as direct as possible with a minimum of valves to reduce
pipe friction losses.
A check valve and closing valve should be installed in the discharge line and a closing valve in the suction line. The
check valve, between the pump and closing valve, protects the pump from water hammer and prevents reverse
rotation in the event of power failure.
The closing valves are used in priming, starting and when the pump is shut down. The pump must never be throttled
by the use of a valve in the suction line.
Final Coupling Alignment:
Check safety codes, and always install protective guard or shield as required by the various federal, state and local
laws and the regulations concerning OSHA.
The final coupling alignment must be made after the piping has been connected. If realignment is required,
disconnect the piping first then proceed with the alignment. Reconnect the piping after alignment has been
completed, and check the alignment before connecting the coupling.
A flexible coupling must not be used to compensate for misalignment resulting from poor installation or temperature
changes.
Periodic Check:
Coupling misalignment can occur because of shifts in grouting, foundation or because of large objects going through
the pump causing shock-loading conditions.
Coupling alignment should be checked periodically for changes. Coupling misalignment can lead to or cause bearing
failure, coupling failure, shaft breakage, and high power consumption.
Refer to the coupling installation instructions supplied with this O&M for alignment tolerances.
Auxiliary Piping Connections:
Install any additional piping connections, your pump may require such as water seal piping, stuffing box drain,
baseplate drain, and pressure gauges.
NOTE:
For satisfactory pump operation and life, these auxiliary pipe lines must be kept clean.
Rotation:
Before connecting the motor to the pump, bump start the driver and verify rotation is in the proper direction. A
directional arrow on the pump casing indicates the correct pump rotation.
FN-1060 1/7/2019
Fairbanks Nijhuis™
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