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A tracer-gas leak testing method is a nondestructive testing method that detects gas leaks. A variety of methods with different sensitivities exist. Tracer-gas leak testing is used in the petrochemical industry, the automotive industry, and in the manufacture of semiconductors, among other uses.
Video Tracer-gas leak testing
Types
Several tracer-gas leak testing methods exist, including:
- Detection of leaks using helium mass spectrometer, which provides high sensitivity
- Hydrogen leak testing, which provides the best mobility
- Refrigerant gas leak detection, for refrigeration applications
Maps Tracer-gas leak testing
Method selection
Typical leakage rates
The nature of the product or the process and the process gases will set the leak rate requirement:
Sensitivity of methods
Based on the target leak rate, the table below will help to choose the most suitable method.
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Applications
Typical applications of tracer-gas leak testing include:
- In petrochemical plants, hydrocracking, vapocracking, catalytic reforming, and steam reforming are all hydrogen-based processes, in which were hydrogen leak testing is required.
- When manufacturing semiconductors, all processes taking place in a process chamber at atmospheric pressure or under vacuum - diffusion, oxidation, LPCVD, PECVD, PVD and ion implantation - require helium or hydrogen leak testing.
- In vehicles, airbags have to be tested for leaks so they remain functional for a long time. As well as airbags, the air conditioning system, fuel system, and exhaust system require testing for leaks.
- Pacemakers and catheters have to be tested for efficacy and longevity.
- On planes, tracer-gas leak testing is used to quickly and safely locate fuel leaks, as well as to check oxygen distribution devices and cabin pressurization systems.
- Refrigeration and air conditioning must have the lowest possible rate of loss of refrigerant gases (contributing to ozone depletion).
- Sewage and drinking water networks, to reduce loss of water and make sure drinking water is not contaminated by sewage.
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Standards
Several standards apply to leak testing and more specifically to tracer-gas leak testing methods, for example:
- BS EN 1779:1999; leak tightness by indication or measurement of gas leakage,
- BS EN 13185:2001 Non-destructive testing. Leak testing. Tracer gas method,
- BS EN 13192:2002 Non-destructive testing. Leak testing. Calibration of reference leaks for gases.
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References
Source of the article : Wikipedia
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