Wilo Atmos GIGA-I Einbau- Und Betriebsanleitung Seite 56

en
r ≈ 2,5 * (d-2s)
5 x DN
Fig. 4: Settling section upstream and down-
stream of the pump
Final check
56
Installation
CAUTION
Risk of damage due to incorrect handling!
The pump may never be used as a fixed point for the pipe.
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The present NPSH of the system always has to be greater than the required NPSH
of the pump.
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The forces and torques being exerted by the pipeline system on the pump flange
(e.g., by warping, thermal expansion) may not exceed the permitted forces and
torques.
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The pipes and pump must be free of mechanical stress when installed.
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The pipes must be fixed in such a way that the pump does not have to support the
weight of the pipes.
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The suction line is to be kept as short as possible. Lay the suction line to the pump
so that it continuously rises while the inlet falls. Avoid possible air entry points.
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If a dirt trap in the suction line is required, its free cross-section has to be 3 – 4
times the cross-section of the pipe.
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For short pipes, the nominal diameters must be at least those of the pump connec-
tions. For long pipes, determine the most economical nominal diameter in each
case.
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To avoid higher pressure losses, make adapters for larger nominal diameters with
an extension angle of approx. 8.
NOTICE
Avoid flow cavitation!
• A settling section must be provided upstream and downstream of the pump in
the form of a straight pipe. The length of the settling section must be at least
5 times the nominal diameter of the pump flange.
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Remove the flange covers at the suction and pressure ports of the pump before at-
taching the piping.
Check the alignment of the unit again according to the chapter "Installation".
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Tighten the foundation bolts if necessary.
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Check all connections for correctness and function.
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It must be possible to turn the coupling/shaft by hand.
Do not allow the coupling/shaft to turn:
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Release the coupling and re-tighten with the prescribed torque.
In case this measure is not successful:
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Remove the motor (see chapter "Changing the motor").
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Clean the motor centring and flange.
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Reinstall the motor.
WILO SE 2022-06