BA series pumps
1401 Pump unit installation
5.10
Note
In the case of self-priming pumps fitted with a separate suction bend, this bend must never be removed
or rotated.
– For liquids with a low viscosity, either install a foot valve with a diameter equal to or greater than that
of the suction valve or install the piping without a foot valve in a U-configuration (see technical
specifications BA series).
– Do not install a foot valve when pumping high viscosity liquids. The foot valve causes extra pipe
losses.
– To eliminate any air or gases present in the pump or suction pipe, the pressure pipe can be fitted with
a bypass line.
The use of a bypass line will eliminate air from the pump more quickly. See also ‘Pressure pipe’.
– In some situations the temperature of the liquid may be so high that the
pump requires pre-pressure relative to the NPSH in the line (see technical specifications BA series).
WARNING
In all cases in which pre-pressure is desired you must contact BBA Pumps for
advice. Pre-pressure may not be employed without written permission from BBA
Pumps.
WARNING
Piping with an inadequate diameter, an excessively long suction pipe or a clogged
suction strainer can cause the pipe losses to increase to the point that the available
NPSH (NPSHa) falls below the required NPSH (NPSHr). This results in cavitation of
the pump. This is damaging to the pump and has a negative impact on the operation
of the pump unit.
– Piping causes a resistance. This is referred to as ‘piping resistance’. This is shown in the table below.
Nomogram for the calculation of the piping resistances, valid for liquids with a viscosity of 1 cSt (e.g.
water).
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