Grundfos JP Installation And Operating Instructions Manual page 8

• Make sure the pipes are as straight as possible
to avoid unnecessary bends and fittings. We
recommend long-radius 90 ° pipe bends to
decrease friction loss.
• Run the inlet pipe as direct as possible and,
ideally, make sure the length is at least ten times
the pipe diameter.
• If possible, run a horizontal inlet line. We
recommend a gradual upward slope for pumps
operating in suction-lift conditions, and a gradual
downward slope for pumps operating in positive
inlet-pressure conditions.
• A short pipe must be of the same diameter as the
inlet port or larger.
• A long pipe must be one or two sizes larger than
the inlet port, depending on the length.
Recommended pipe installation to avoid friction and
air pockets
Correct pipe sizing for connection to the pump inlet
or outlet
8