Operating instructions B-Series
Version 2.4, En Page 34 of 81 21-10-2005
5.4 Pressure line
For closing the pressure line for assembly and repair activities there must be a valve near the delivery
flange.
The valve can be used to regulate the volume flow.
Extra point(s) for attention with ATEX pumps.
P1.
M5.
M6.
B4a
Do not expose the pump to higher pressures than which pump is suitable
according to the curve.
Fit the correct packing.
Check the resistance list to ensure that assembled elastomers are suitable for the
pumped medium. ∗
∗∗
∗
Protect the pump against overpressure. Set the max. pressure to 10% above the
original pump curve.
• Only required when pumping volatile liquid.
• Or with a dangerous liquid.
• (Only with Cat. 2 pumps)
∗
∗∗
∗
With an Ex-pump (unit) supplied by BBA Pompen these aspects are ensured for the application
indicated by the client with the associated indicated medium.
Dangers relating to
the software:
It is the responsibility of the employer to ensure that the
safety measures (such as protection with overpressure) and
the resulting action (such as the stoppage of the pump) are
appropriately included in the safety circuit.
5.5 Self-priming operation
With self-priming operation, at the start-up of the pump sufficient liquid must be present in the pump to
fill the internal pump slots and “dead” spaces so the pump can build up a pressure difference.
With liquids with low viscosity therefore install either a foot valve with the same or larger diameter as the
suction valve, or set the pump without foot valve in U-form (see technical specifications B-Series). This
U-form can also be used if the liquid temperature is so high that the pump needs pre-pressure with respect
to the NPSH line (see technical specifications B-Series).
A foot valve is not recommended with highly viscous liquids because of additional piping losses.
To remove the air and gases present in the suction line and pump, the
counterpressure on the delivery side must be limited. With self-priming
operation therefore start the pump with empty and open pressure line so the
air or gases can escape at low counterpressure.
With long piping or with the presence of a non-return valve in the pressure line, a bypass-pipe with valve
can be fitted close to the pump on the delivery side. This is opened with suction and the air or the gases
will be removed at low counterpressure. Do not lead this bypass back to the suction side of the pump, but
e.g. to the supply tank (see section, technical specifications B-Series).
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