English (GB)
19
8.6 Pipework
8.6.1 Piping
When installing the pipes, make sure that the pump
housing is not stressed by the pipework.
The suction and discharge pipes must be of an
adequate size, taking the pump inlet pressure into
account.
Install the pipes so that air locks are avoided,
especially on the suction side of the pump.
Fig. 17 Pipelines
Fit isolating valves on either side of the pump to
avoid having to drain the system if the pump needs
to be cleaned or repaired.
Make sure the pipes are adequately supported as
close to the pump as possible, both on the suction
and the discharge side. The counter flanges should
lie true against the pump flanges without being
stressed as stress would cause damage to the
pump.
Fig. 18 NB, NBG pump installation
8.6.2 Direct mounting in pipework
Pumps fitted with motors up to and including frame
size 132 are suitable for direct mounting in
supported pipework.
Fig. 19 Direct mounting in pipework
This type of installation does not allow the use of
expansion joints.
8.6.3 Bypass
If there is any danger of the pump running against a
closed discharge valve, a minimum liquid flow
through the pump should be ensured by connecting
a bypass or drain to the discharge pipe. The
minimum flow rate must be at least 10 % of the
maximum flow rate. The flow rate and head are
stated on the pump nameplate.
TM00 2263 3393TM05 3311 1112
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TM05 3337 1212
To ensure quiet operation, the pipes
should be suspended from suitable pipe
hangers.
Warning
The pump is not allowed to run against a
closed valve as this will cause an increase
in temperature/formation of steam in the
pump which may cause damage to the
pump.
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