Here is a tale of two different industries. Leak testing for components and assemblies is a requirement in both the automotive and the refrigeration industries, but the leak specifications, methodologies, and associated costs are substantially different. Leak detection methods and the level of specification/complexity of the refrigeration industry lags behind the automotive industry, but there is a trend toward more sophisticated leak testing in this industry.
In the automotive industry there are numerous applications for leak testing for a variety of components that are manufactured in relatively high volumes. These components include things such as: tire rims, condensers, heat exchangers, evaporators, transmissions, braking systems, fuel tank systems, torque converters, air bag inflators, catalytic converters, compressors, shock absorbers, oil pans, and muffler/silencers. Some of these components include compressors, muffler/silencers and transmissions.