How should the lines and fittings of an oxygen system be tested for leaks?

The preferred method for testing the lines and fittings of an oxygen system for leaks is to use a bubble test with a special soap solution. This technique involves applying the soap solution to the joints and connections in the system. When there is a leak, air escaping through the joint will create bubbles in the solution, clearly indicating the location and presence of a leak.

This method is particularly effective in oxygen systems because it is sensitive enough to detect even small leaks, which is crucial for safety and efficiency in aircraft operations. The special soap solution is designed to be compatible with oxygen and does not pose additional risks, ensuring that the testing process is safe and reliable.

Other methods, while they may be useful in some contexts, do not provide the same level of sensitivity or assurance in identifying leaks specific to oxygen systems. For example, using a pressure gauge may not detect small leaks that don’t significantly change the pressure reading, and vacuum tests, although also effective in some cases, may not be practical for all types of oxygen systems. Visual inspections for damage, while helpful, are not sufficient on their own as they do not directly measure leak integrity. Thus, the bubble test stands out as the most reliable and straightforward method for leak detection in oxygen systems.