Install Instructions

A
C
B
TM075004
Base plate
[mm (in)]
A 135 (5.3)
B 163 (6.4)
C 174 (6.9)
5.2 Connecting the pipe system
Make sure that the pump is not stressed by the pipe
system.
Always loosen and tighten the union nuts on the inlet and
outlet ports by hand. Damage to the inlet and outlet parts
increases the risk of leakage.
We recommend that you install isolating valves on the
inlet and outlet side of the pump.
1. Turn the union nuts by hand to loosen the inlet and outlet ports.
2. Seal the pipe fittings with thread sealing tape.
3. Carefully screw the inlet and outlet connections onto pipe fittings
using a pipe wrench or a similar tool. Keep the union nut on the
pipe fitting if you have removed it from the pump. The pump is
equipped with flexible connections, ± 5 °, to facilitate the
connection of inlet and outlet pipes.
4. Fasten the connections to the inlet and outlet ports by holding
the connection with one hand and tightening the union nut with
the other hand.
1
2
3
TM075341
Inlet pipe with a gradual upward slope towards the pump
Example:
Pos. Description
1 Inlet and outlet port
2 Union nut
3 Pipe fitting
5.2.1 Inlet and outlet pipes
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.
• 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
that 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.
• 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.
TM040338
Recommended pipe installation to avoid friction and air pockets
8
English (GB)