Virtual leak
Virtual leaks are apparent leaks in vacuum systems .
They behave in a similar way to real leaks, but cannot be located using the methods of leak detection and leak testing. That is why the search for virtual leaks is very time-consuming.
Virtual leaks are caused by outgassing (e.g. gas release from the inner walls of a recipient), desorption , enclosed cavities (e.g. in a casting) and undesired residues from manufacturing or cleaning.
Since apparent leaks cannot be detected from the outside, everything must be done in the design, planning, production and assembly stages to prevent them. This includes, for example, the use of suitable materials and their degassing prior to assembly, special cleanliness conditions during production and assembly, and design precautions (e.g. testability).
literature
- Chr. Edelmann: gas delivery . In: Manfred von Ardenne u. a. (Ed.): Effects of physics and their applications . 3rd, revised, restructured and significantly expanded edition. Harri Deutsch, Frankfurt am Main 2005, ISBN 3-8171-1682-9 , p. 320 f . ( Full view in Google Book Search).
Web links
- vacuumlab.com - Understanding Virtual Leaks (English; PDF; 50 kB)