Full-Text - Abstract

There is a constantly growing need for products and technologies that for their realisation require hermetically closed elements, vessels and tubes. Envelopes with greater or smaller vacuum tightness had to assure a satisfactory isolation between external atmosphere and inside over- or under-pressure. Crytical leak spots in closed systems are usually: connections, gaskets, welded and brazed joints, defects in material etc. Regarding to quality demands in different production processes, technical people very often encounter with standards for tightness testing. Wishing to state if an element or system meets with corresponding standards we have to be familiar with the procedures enabling the following appointments:

- question if there is leakage or not
- settlement of the leak size
- detection of leak locality


For solving the mentioned problems different treatments and techniques are known but among them there is no an universal method. Each testing is suitable only for a selcted leak rate or for fixed forms and technologies. Our article presents the leak types, their sizes and various leak detection techniques.

Keywords: tightness, leakage, trace gas, helium mass spectrometer leak detector, hermetic sealing

Source: Conference Proceedings of the 4th International Conference of the Slovenian Society for Nondestructive Testing, 24 - 25 April 1997, Ljubljana, Slovenia.
Pages:247 - 256

Publisher:
Slovenian Society for Nondestructive Testing, Faculty of Mechanical Engineering, Askerceva 6, SLO 1000 Ljubljana, Slovenia. Tel +386 61 177 12 03, Fax +386 61 218 567, Email: janez.grum@fs.uni-lj.si.