1.3
Appointment.
1.3.1
Recommended use
The pumps of the 2BV2 and 2BV5 series are suitable for continuous operation. They can be used
to pump dry and wet non-combustible gases with low corrosivity, such as atmospheric air and vapor
mixtures.
The 2BV6 series is used for pumping flammable and explosive gases. The working fluid in these
pumps is usually water.
Stainless steel pumps are used for pumping moderately corrosive gases and in industries
where it is necessary to monitor compliance with sanitary requirements.
The 2BV series is used to create a rough vacuum, the ultimate vacuum value in such
pumps is limited by the saturated vapor pressure of the working fluid.
1.3.2
Minimum residual pressure
The minimum residual pressure depends on the temperature and process fluid.
Please note: If the pump is not cavitation protected, the inlet pressure must not fall below
80 mbar. This is because at a water temperature of 15°C, a pumped gas temperature of 20°C,
and a pressure of less than 80 mbar, saturated vapor bubbles can begin to form in the water -
cavitation will develop. As these bubbles collapse, they will form micro water hammer and
damage the impeller. If your liquid temperature is higher, or you are using something other than
water, make sure that the saturated vapor pressure for your liquid at that temperature is always
lower than the minimum residual pressure in your system.
The higher the temperature of the working fluid, the lower the suction capacity of the pump.
If the pump is used for a long time at a pressure lower than the permissible pressure, cavitation will
inevitably destroy the pump.
1.3.3
Maximum outlet pressure
When using a working fluid, according to Table 2 in the appendix, the maximum outlet
pressure will be:
•
for 2BV2 pumps - 1200 mbar;
•
for 2BV5 and 2BV6 pumps - 1300 mbar.
1.3.4
Requirements for the pumped medium
The pumped gas or gas-vapor mixture must not contain solid inclusions, except for a small
amount of suspended particles.
Table 2 shows the maximum amount of water allowed to be sucked through the flanges.
If gas or steam with a temperature above 80°C is being pumped, it is recommended to use an
increased supply of fresh working fluid (see Table 2) or to use a cooler.
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