Knowing the flow rate and vacuum level needed at a given application point, you can choose up between three different models of vacuum pumps. **What is the most appropriate option?**

Considering that the flow rate is constant and proportional to the rotation speed, we can install a smaller vacuum pump at high revs.

If we go up to the next level in terms of size, we would have a larger vacuum pump turning at a lower rotation speed than the previous one, with also lower energy consumption.

The option of the largest pump turning at its lowest revs, would be the ideal solution, but with a much higher starting price.

For example, for a flow rate of 182 m3/min* and a vacuum level of 450 mbar*, we could choose between the vacuum pumps AP94M1 (Equivalent to 904M1), AP94P1 (Equivalent to 904P1) and AP94S1 (Equivalent to 904S1).

The AP94M1 would be running at 500 rpm with a consumption of 226 kW.

The AP94P1 would be running at 303 rpm but with a consumption of 165 kW.

The AP94S1 would be running at 181 rpm but with a consumption of 143 kW.

**Air temperature: 40ºC – Liquid ring temperature: 28ºC*

Therefore, **our recommendation is always to select the vacuum pump whose flow rate is located in the middle of the curve**, thus ensuring the correct pump performance and energy savings in the medium-term.

If you have any question, please do not hesitate to contact with our Export Manager:

**Jaime Retana ** Tel. +33 6 80 27 93 50

retana@okobio.com