Operating instructions B-Series
Version 2.4, En Page 14 of 81 21-10-2005
Extra point(s) for attention with ATEX pumps.
The maximum permissible liquid temperature in ATEX zones.
Category 2/3 zone Maximum liquid
temperature
T1
180
C
T2
180
C
T3
120
C
T4
65
C
For correct use of the pump attention must be devoted to materials, the environment (ATEX zone),
liquid, viscosity, temperature, working pressure, number of revolutions etc.
•
The application and area of use are limited depending on the selected pump version. This was
selected in consultation between the user and supplier based on the information the supplier
disposed of at the time of the purchase.
•
The supplier is not responsible for damage to the pump/pump unit that is the consequence of
missing and not specified information at the time of purchase (such as, for example the
composition of the liquid, environment, temperature, number of revolutions, quantity and size of
the solid components, etc.).
•
The pump/pump unit may under no circumstances be used for another application than that for
which it was originally purchased and installed.
•
The changing of the application may only take place after consultation with, and with the written
agreement of BBA Pompen BV.
3.3 Working of the pump
The self-priming centrifugal pump distinguishes itself from the normally priming centrifugal pump by its
air processing capacity. The pump housing of a self-priming pump is constructed so that a part of the
pumped liquid flows back to the suction side. When air is drawn this is mixed with the liquid in the pump
housing. The mixture of air and liquid can be pumped through the rotor. The mixture will be separated
after leaving the rotor. The air is removed through the pressure line, while the heavier water returns
through a type of return pipe in the pump housing and falls to the suction side. This process continues
until all air has been pumped out of the suction line. The pump then forces out the water that was drawn in
through the pressure line.
A condition for starting this process is that before the pump is started up the pump housing is fully filled
with liquid. Filling can take place through the inspection cover on top of the pump. The big advantage of a
self-priming centrifugal pump is that no separate vacuum pump is needed to pump the air out of the
suction line.
The disadvantage, however, is that the performance of a self-priming centrifugal pump is usually lower
than that of a normally priming centrifugal pump. This is because a part of the pumped liquid in the pump
housing is returned to the suction side.
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