Speck pumpen BADU 90 Série Instructions De Montage Et D'utilisation page 60

5.2 Installation
The pump must by no means be used as a supportive point for the pipes. The
pipes must be installed in such a way that no force or torque will be transmitted
to the pump (e.g. by distortion or thermal expansion). The pipe must have a
supportive fixation point directly in front of the pump so that its connection to
the pump is free of tension. This should be done by using suitable compensa-
tors.
If the pipe strength is exceeded, leaks can occur at the pump itself or at the
flange connections, which could result in vast losses of medium.
The suction pipe should be installed with a continuous upward angle and the
pressure pipe with a continuous downward angle in order to avoid air locks.
We recommend the installation of check valves and shut-off valves, according
to the type of pump or plant.
Expansions of the pipes caused by temperature must be compensated by ap-
propriate means. We recommend the installation of compensators between
pump and pipe. Sudden closing of valves in pipes must be avoided. The resul-
tant pressure impacts caused by such shut offs often exceed the max. permis-
sible housing pressure of the pump by far. To absorb sudden pressure impacts,
dampers or expansion tanks must be installed.
Caution: The connecting parts of BADU 90/7 to 90/20 must be sealed with Taf-
lon tape only. Other sealing material can damage the thread or have only an
unsufficient sealing effect.
With BADU 90/25 to 90/48 the ABS-glue-connections, glue socket (721), requi-
re a longer hardening period. A minimum 12 hours must be admitted between
the gluing and the first start-up of the pump.
5.3
CAUTION
Mechanical / Hydraulic:
The pump must be installed in a horizontal position in dry condition. A shutoff
valve shall be provided in the suction- and pressure-pipe. It may be installed
either max. 3 m below (gravity feed) or above of the liquid level (suction
mode). Thereby the geodetic head between liquid level and pump inlet must not
exceed 3 m. The suction lift may be significantly reduced by flow resistance in
the suction line, if the pipes are very long and/or insufficiently dimensioned.
The suction pipe dimensions in the table are only valid for suction pipes not
longer than 5 m. With longer pipes the flow resistance increases and suction is
impaired. Danger of cavitation is also increased. Make sure that the suction
line is not leaky, otherwise the pump will prime insufficiently or not at all.
The transparent lid must be screwed on tightly and the suction/intake line
should be as short as possible. This will reduce priming time, which is depen-
dent on the air volume in the intake line. If the intake line is very long this may
take up to 12 minutes. If possible the intake line to the pump should be installed
below the liquid level. Whenever the pump is installed above the liquid level it is
recommended to install a foot valve in the intake line. Thus the suction pipe
cannot drain itself when the pump has been turned off. This keeps priming
times short e.g. after having cleaned the strainer basket (143).
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