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7.3.3 Pouring out the baseplate
7.4
Pipework
Fig. 10: Connecting the pump stress-free
Installation and operating instructions Wilo-CronoNorm-NL, NLG
• If vibrations are to be reduced to a minimum, after fastening, the
baseplate can be poured out with a non-shrinking mortar over its
openings (the mortar must be suitable for installation on a base).
Hollow spaces are to be avoided. The concrete surface must be mois-
tened beforehand.
• The base/baseplate is to be planked.
• After curing, the anchor bolts are to be checked for a tight fit.
• The unprotected surfaces of the base are to be protected against
moisture with a suitable coating.
CAUTION! Risk of damage to property!
Improper pipework/installation can lead to property damage.
• The pipe connections of the pump are provided with protective
caps so that no foreign objects can penetrate during transport and
installation. These caps must be removed before connecting pipes.
• Welding beads, cinder and other contaminants can damage the
pump.
• The pipes must be sufficiently dimensioned, taking the pump inlet
pressure into account.
• The pump and pipes are to be connected using suitable seals, tak-
ing the pressure, temperature and fluid into account.Make sure the
seals are correctly fit.
• The pipes must not transfer any forces to the pump. They are to be
braced directly in front of the pump and connected without tension
(see Fig. 10).
• The permissible forces and torques on the pump connecting piece
are to be observed (see section 6.4 "Permissible forces and torques
on the pump flanges" on page 65).
• The expansion of the pipes in the event of a temperature rise is to
be compensated by suitable means (see Fig. 10). Air enclosures in
the pipes must be avoided by means of a corresponding installa-
tion.
NOTE:
The installation of return flow inhibitors and check valves is recom-
mended. This allows the pump to be drained and maintained without
having to drain the entire system.
NOTE:
A settling section must be provided before and after the pump, in the
form of a straight pipe. The length of this settling section should be at
least 5 x DN of the pump flange. This measure serves to avoid flow
cavitation.
• The pipes and pump must be free of mechanical stress when installed.
The pipes must be fastened in such a way that the pump does not
bear the weight of the pipes.
• Before connecting the pipes, the system must be cleaned, flushed and
blown through.
• The covers must be removed from the suction port and discharge
port.
• If required, a dirt filter is to be inserted in front of the pump in the pipe
on the suction side.
• Then connect the pipes to the pump connecting piece.
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