1. Description of need
The best way to express a need is to illustrate the description of the problem by means of a synoptic diagram of the installation, using standardized graphic symbols.
1.1 Graphic symbols
Graphic symbols are defined by the DIN 28401 . Some of those commonly used are shown in the figure. 1 . Elbows, crosses and tees are not defined by the standard, but when sizing an installation, it is necessary to know their presence, number and dimensions (diameter, length). It is therefore important to show them on a diagram.
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Description of need
Elements of low-pressure gas theory
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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