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.

Model
Power Supply Frequency
Volume
L
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.