Xylem P81547D Series 90 In-Line Centrifugal Pump - Manual (Page 13)

Guideline Explanation/comment
If the pump location is overhead, undertake special
precautions to reduce possible noise transmission.
Consider a consultation with a noise specialist.
When possible, locate the pump below the fluid level. This facilitates priming, ensures a steady flow of liquid,
and provides a positive suction head on the pump.
Mode of discharge
You can install this pump to discharge either vertically or horizontally. The arrow on the
pump body must point in the direction of the flow.
You can install the pump with the motor either vertical or horizontal. Do not install the
motor below the pump body.
Piping checklist
WARNING:
• The heating of water and other fluids causes volumetric expansion. The associated forces
can cause the failure of system components and the release of high-temperature fluids.
In order to prevent this, install properly sized and located compression tanks and
pressure-relief valves. Failure to follow these instructions can result in serious personal
injury or death, or property damage.
• Avoid serious personal injury and property damage. Make sure that the flange bolts are
adequately torqued.
• Never force piping to make a connection with a pump.
Check Explanation/comment Checked
Check that a section of straight pipe, with a length that
is five times its diameter, is installed between the
suction side of the pump and the first elbow, or that a
suction diffuser is installed.
This reduces suction turbulence by
straightening the flow of liquid before it enters
the pump.
Check that the suction and discharge pipes are
supported independently by use of pipe hangers near
the pump .
This eliminates pipe strain on the pump .
Check that there is a strong, rigid support for the
suction and discharge lines.
As a rule, ordinary wire or band hangers are not
adequate to maintain proper alignment.
For pumps with flanges, check that the bolt holes in
the pump flanges match the bolt holes in the pipe
flanges.
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Check that the suction or discharge lines are not
forced into position.
Coupling and bearing wear will result if suction
or discharge lines are forced into position.
Check that fittings for absorbing expansion are
installed in the system when considerable
temperature changes are expected.
This helps to avoid strain on the pump.
Check that you have a foot valve of equal or greater
area than the pump suction piping when you use an
open system with a suction lift.
Prevent clogging by using a strainer at the
suction inlet next to the foot valve. Make sure
that the strainer has an area three times that of
the suction pipe with a mesh hole diameter of
no less than 0.25 in. (0.64 cm).
Check that a triple duty valve is installed in the
discharge line.
This valve serves as a check valve that protects
the pump from water hammer, and serves as
an isolation valve for servicing and for
throttling.
Installation
12 Series 90 Installation, Operation, and Maintenance Manual