Wilo CronoLine-IL Notice De Montage Et De Mise En Service page 49

D C E
Fig. 15: Example of a foundation screwed connection
Connection of the pipes
r ≈ 2,5 * (d-2s)
5 x DN
Fig. 16: Settling section in front of and behind the
pump
Installation and operating instructions Wilo-CronoLine-IL, CronoTwin-DL, CronoBloc-BL
CAUTION! Risk of material damage!
Risk of damage due to incorrect handling.
• When pumping out a tank, ensure that the fluid level is always high
enough above the suction port of the pump so that the pump never
runs dry. The minimum inlet pressure must be observed.
NOTICE:
In the case of insulated systems, only the pump housing may be insu-
lated, not the lantern and motor.
Example of a foundation screwed connection (Fig. 15):
A B • Align the whole unit when installing on the foundation with the help
of the spirit level (at the shaft/pressure port).
• Always put the washers (B) to the left and right directly at the fixation
material (e.g. stone bolts (A)) between the baseplate (E) and founda-
tion (D).
• Evenly and firmly tighten the fixation material.
• For distances > 0.75 m, support the baseplate at the centre between
the fixation elements.
CAUTION! Risk of material damage!
Risk of damage due to incorrect handling.
• Under no circumstances may the pump be used as a fixed point for
the pipe.
• The present NPSH of the system always has to be greater than the
required NPSH of the pump.
• The forces and torques being exerted by the pipe system on the pump
flange (e.g., by warping, thermal expansion) may not exceed the per-
mitted forces and torques.
• Brace the pipes directly before the pump and connect them without
tension. Their weight must not put a strain on the pump.
• The inlet pipe is to be kept as short as possible. Lay the inlet pipe to
the pump so that it continuously rises while the intake falls. Avoid
possible air entry points.
• If a dirt trap in the inlet pipe is required, then its free cross-section has
to be 3 – 4 times the cross-section of the piping.
• For short pipes, the nominal diameters should be at least that of the
pump connections. The long pipes, the most economical nominal
diameter is to be determined on a case-by-case basis.
• Adapters for larger nominal diameters should be made with a flaring
angle of about 8° to prevent greater pressure losses.
NOTICE:
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 (5 times of the nominal diameter) of the pump flange
(Fig. 16). This measure serves to avoid flow cavitation.
• Remove the flange covers at the suction and pressure ports of the
pump before attaching the piping.
English
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