Airtightness test of vacuum system
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What is the procedure for conducting a gas-tightness test on a vacuum system? How is compliance determined?
The vacuum system can use ammonia leak detection or helium leak detection; I can’t quite remember the specific methods.
Vacuum pressure retention method: Reduce the pressure to a certain level and keep the system sealed for 24 hours or 48 hours. . . Check how high the pressure rises (the pressure after the rise must not exceed 500 mbar abs), and then, based on the volume, the air leakage rate can be calculated. Then compare the vacuum pump you have chosen: at the designed operating pressure, its ability to remove air should be greater than the amount of air leaking in.
Are there any relevant regulations for this? What materials or standards should be looked for? Which expert can tell me! Thank you! :)