Calculator of Evacuation Time of Rotary Vacuum Pump

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Calculate the evacuation time of Rotary Vacuum Pump.

Select each item and enter the figures in the volume.

Power Supply Frequency
Initial Pressure
kPa abs
Final Pressure
kPa abs

Evacuation Time {{minute}} minute 
         ( {{second}} second )

To find a time to evacuate air from sealed space (tank) from initial pressure to the final pressure (target vacuum degree), use the following formula for calculation.

t : Evacuation (pumping) time(min)
V : Volume(L)
S : Pumping speed(L/min)
P1 : Initial Pressure(kPa abs)
P2 : Final Pressure(kPa abs)

When carrying out the above calculation, since pumping speed: S of the rotary vacuum pump changes by pressure ranges, first calculate each evacuation time of divided pressure range: t1, t2, t3, and so on, then calculate the sum: t0. Refer to this link for details.