Vacuum - Evacuation Time

Calculate the evacuation time for a vacuum pump using the formula: t = V / q ln(p0 / p1), where t is evacuation time, V is enclosed evacuated volume, q is volume flow rate capacity of the vacuum pump, p0 is initialization pressure (atmospheric), and p1 is end vacuum pressure.

Calculator

Inputs

Enclosed Evacuated Volume (V) (m³)

Volume Flow Rate Capacity (q) (m³/s)

Initial Pressure (p0) (mbar)

End Vacuum Pressure (p1) (mbar)

Results

Evacuation Time (t)-- s

End Pressure (mbar)	Evacuation Time (s)	Natural Log Constant (N)
500	=inputs.volume / inputs.flowRate * Math.log(inputs.initialPressure / 500)	1.386
100	=inputs.volume / inputs.flowRate * Math.log(inputs.initialPressure / 100)	2.303
10	=inputs.volume / inputs.flowRate * Math.log(inputs.initialPressure / 10)	3.219