What technique is used to identify leaks in pneumatic systems?

The soap bubble test is a widely used technique for identifying leaks in pneumatic systems. This method involves applying a soap solution to the potential leak areas. When air escapes through a leak, it creates bubbles in the soapy water, which can be easily seen. This visual indication makes it straightforward to locate small leaks that might otherwise go unnoticed.

The effectiveness of the soap bubble test comes from its simplicity and reliability. While other methods may also detect leaks, such as the pressure test or ultrasonic test, the soap bubble test is often preferred for its ease of use and the immediate visual feedback it provides. It does not require specialized equipment—just a mixture of soap and water, making it an accessible option for maintenance technicians.