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Article | REF: B4110 V1

Very low-pressure gas - Formulas and tables

Author: Guy ROMMEL

Publication date: August 10, 1985

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15. Pre-emptying time. Pressure drop

Up to 1 or 10 Pa, as long as no outgassing occurs, the formula can be used: t=Vqνlnp0p

with p 0 = 1.013 × 10 5 Pa.

The diagram in figure 13 shows the pre-evacuation time, from atmospheric pressure, of an enclosure of given volume pumped by a system with a known flow rate.

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