Leak Detection

Authored by: Igor Bello

Vacuum and Ultravacuum

Print publication date:  November  2017
Online publication date:  November  2017

Print ISBN: 9781498782043
eBook ISBN: 9781315155364
Adobe ISBN:


 Download Chapter



Leaks are small holes, interconnected pores, or capillaries crossing walls of a vacuum system. Probability of their occurrence is higher in detachable sealing areas and permanent welded or soldered joints. We discuss gas flows via capillaries in Chapter 7.23 to some extent. However we should differentiate actual leaks via small holes and virtual leaks, as well as permeation. Virtual leaks are a result of gradual desorption of gases from the internal surfaces and bulk when materials are exposed to vacuum. At low pressure, the gases may represent a huge volume and therefore may behave as permanent gas sources. Gas permeation, as discussed in Chapter 8.13, is penetration of gases through compact solids without the presence of holes, pores, or capillaries (leaks). Based on some measurement of gas flow dependent on pressure and time, we may recognize the mechanism of gas penetration.

Search for more...
Back to top

Use of cookies on this website

We are using cookies to provide statistics that help us give you the best experience of our site. You can find out more in our Privacy Policy. By continuing to use the site you are agreeing to our use of cookies.