Calculate time to evacuate a volume to target vacuum with known pumping speed.
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Use the Vacuum Evacuation Time Calculator to calculate time to evacuate a volume to target vacuum with known pumping speed. The calculator uses Vacuum volume, Start absolute pressure, Target absolute pressure and Effective pump speed and reports evacuation time.
Read the result in the context of the selected units and pressure basis. For this tool, the primary outputs are evacuation time. Change one input at a time when comparing scenarios so the effect of each variable remains clear.
PneumaForge applies this verified method: t=(V/S_eff)·ln(P1_abs/P2_abs). The functional engine is shared with related tools in the vacuum-evacuation family, while this page solves the specific intent represented by vacuum evacuation time calculator.
t=(V/S_eff)·ln(P1_abs/P2_abs).Reproducible example: start with the calculator's default values (Vacuum volume = 100; Start absolute pressure = 1.01325; Target absolute pressure = 0.2; Effective pump speed = 1000) and calculate the result. Then change the variable most relevant to your application and compare the new evacuation time against the baseline.
Constant effective pumping speed, negligible leaks/outgassing; industrial rough-vacuum only unless a more detailed pump curve is supplied.
It is designed to calculate time to evacuate a volume to target vacuum with known pumping speed. The reported outputs are evacuation time.
The calculator uses Vacuum volume, Start absolute pressure, Target absolute pressure and Effective pump speed. Only use values that represent the same operating condition or design case.
The calculation follows: t=(V/S_eff)·ln(P1_abs/P2_abs). The page also states the assumptions that define where the method is valid.
Constant effective pumping speed, negligible leaks/outgassing; industrial rough-vacuum only unless a more detailed pump curve is supplied.
Yes. PneumaForge converts supported units through canonical engineering units. For compressed-air reference flows and pressure bases, the reference pressure and temperature must also remain consistent.