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3. Pumping a volume
Volume pumping refers to the action of lowering the gas pressure in a volume. This is achieved using a vacuum pump. Vacuum pump performance can be adversely affected if unsuitable piping is used between the pump and the enclosure. As far as possible, the pressure drop introduced by the piping should remain negligible. This is one of the parameters to be checked in an installation calculation. In high-vacuum and ultra-high vacuum, calculations and experiments show that the time required to reach the desired pressure is mainly due not to the size of the volume to be pumped, but to the surface area of the desorbing parts.
3.1 Pumping a volume of coarse and medium vacuum
In coarse and medium vacuum, desorption flows are not taken into account.
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Pumping a volume
Pumping a gas stream
Bibliography
Software tools
Vactran (Windows version), [Software] PEC Corp. Livermore, California, USA
Standards and norms
- Symboles graphiques. - DIN 28401 - 2008
- Vocabulaire et termes généraux. - ISO 3529-1 - 2019
- Pompes à vide et termes associés. - ISO 3529-2 - 2019
- Mesure des performances des pompes à vide. - ISO 21360-1 et 2 - 2020
- Dimensions et raccords rapides à colliers. - ISO 2861 - 2020
- Dimensions des brides. - ISO 1609 - 2020
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