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to the pump (e.g. by distortion or thermal expansion). The pipe must have a sup-
portive 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 compensators.
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 appro-
priate means. We recommend the installation of compensators between pump
and pipe. Sudden closing of valves in pipes must be avoided. The resultant pres-
sure impacts caused by such shut offs often exceed the max. permissible hou-
sing pressure of the pump by far. To absorb sudden pressure impacts, dampers
or expansion tanks must be installed.
5.3
CAUTION
Mechanical / Hydraulic:
The pump must be installed in a horizontal position in dry condition. A shut-off
valve shall be provided in the suction- and pressure-pipe. It may be installed eit-
her 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 lon-
ger 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 pump connections of the BADU 21-80/.. and BADU 21-80/56 must be
sealed with sealing tape only.
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 dependent 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 recom-
mended to install a foot valve in the intake line. Thus the suction pipe cannot
drain itself when the pump has been turned off.
Gravity feed operation:
The pump can be installed below water level (max. 3 m). The pump does not
have to be filled for this purpose, but there must be a possibility for the pump
housing and the suction line to be vented, so that the pump body can fill with
water and the pump will not run dry.
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