Eng
lish (US)
8
6.1.5 Expansion joints
Expansion joints are installed with the following purposes:
•
to absorb expansions/contractions in the pipework caused by
changing liquid temperature
•
to reduce mechanical strains in connection with pressure
surges in the pipework
•
to isolate mechanical structure-borne noise in the pipework
(only rubber bellows expansion joints).
Fit expansion joints at a distance of minimum 1 to 1 - 1/2 times
the nominal flange diameter from the manifold on the suction as
well as on the discharge side. This prevents the development of
turbulence in the expansion joints, resulting in better suction
conditions and a minimum pressure loss on the discharge side.
Fig. 7
Examples of rubber bellows expansion joints without
and with limit rods
Expansion joints with limit rods can be used to minimize the
forces caused by the expansion joints. Expansion joints with limit
rods are always recommended for flanges larger than 6 inch.
The pipework should be anchored so that it does not stress the
expansion joints and the pump. Follow the supplier’s instructions
and pass them on to advisers or pipe installers.
6.2 Electrical installation
•
The electrical installation of the booster system must comply
with enclosure class UL Type 3R.
•
Make sure that the booster system is suitable for the power
supply to which it is to be connected.
•
Make sure that the wire cross-section corresponds to the
specifications in the wiring diagram.
Note
Note
Expansion joints must not be installed to
compensate for inaccuracies in the pipework
such as center displacement of flanges.
T
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902
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Warning
The electrical installation must be carried out by
an authorized person in accordance with local
regulations and the relevant wiring diagram.
