Grundfos JP Installation And Operating Instructions Manual page 7

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How to attach the lifting handle on the pump
3.2.3 Connecting the pipe system
Install the product so that it is not stressed
by the pipe system.
Pipe dimensions:
• The diameter of the inlet pipe must be
larger than 1", if the inlet pipe is longer
than 10 m, or if the suction lift
exceeds 4 m.
• If a hose is used as inlet pipe, it must
be non-collapsible.
We recommend that you install isolating
valves on both the inlet and outlet side of
the pump.
1. Seal the pipe fittings with thread sealing tape or
similar.
2. Connect pipes to the inlet and outlet port on the
pump. Do not let the pump support the pipes.
Use a pipe wrench or similar tool.
3. Fit a foot valve to the inlet pipe if the pump is
installed above the liquid level, for example if you
pump from a well, tank or reservoir. We
recommend a foot valve with strainer.
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4. We recommend that you install a filter on the inlet
side to protect the pump from sand, gravel or
other debris if the pump is to be used for
pumping rainwater or well water.
5. Make sure that the inlet pipe has a gradual
upward slope of 5 ° towards the pump to avoid
air pockets, especially under suction-lift
conditions.
Inlet pipe with gradual upward slope towards the
pump
3.2.3.1 Maximum system pressure
Make sure that the system in which the
pump is installed is designed for the
maximum pump pressure.
The maximum inlet pressure depends on the head at
the actual duty point. The sum of the inlet pressure
and the head must not exceed the maximum system
pressure.
We recommend installing a pressure-relief valve to
protect the pump so that the outlet pressure does not
exceed the maximum system pressure.
3.2.3.2 Inlet and outlet pipes
Please follow these general precautions when
connecting the inlet and outlet pipes.
Do not let the pump support the pipes. Use
pipe hangers or other supports at proper
intervals to provide pipe support near the
pump.
The internal diameter of the pipes must
never be smaller than the diameter of the
pump ports.
• Install the pipes so that air pockets are avoided,
especially on the inlet side of the pump.
• Use eccentric reducers with the tapered side
down.
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