A gas bubble leak detector is a non-destructive method of testing for LPG and Natural gas leaks. It involves coating the gas transmission equipment (pipes, hoses and valves) with soap solution and then letting it pressurize. The surveyor then looks for tell-tale soap bubbles or the rotten egg smell, which indicates the presence of a gas leak. This method is easy to use, cheap to implement and is less prone to human error than other methods such as vacuum decay testing. However, it is subjective and can become tedious if used over long periods.
Acoustic acoustic leak detection systems require the surveyor to conduct a point-by-point inspection, listening for sound through sensitive earphones. The process is time consuming and requires training, making this method impractical in healthcare environments. In addition, it is difficult to distinguish closely spaced leaks and to locate the exact location of the leak.
Another method is to use an ultrasonic bubble leak detector. This requires the surveyor to place the transducer close to the suspected leak and listen for a bubble burst. The sensor then pinpoints the leak location by transmitting a high-frequency signal to the transducer. It is a more reliable method than visual or acoustic based methods, but is still subject to human error.
A third method is to use a fluorescent gas leak detector, such as Gameco Leakcheck. This is a highly viscous, low-toxic liquid which is sprayed over the suspected area. Small leaks will start to appear within a few minutes, while micro leaks may take up to 30 minutes. The liquid is effective over a wide temperature range and can be applied to both heated and chilled areas. It is also non-freezing, clings to surfaces and is unaffected by dirt, oil and water from condensate.