What is the standard method for performing a leak test on fire extinguishers?

A soapy water test is recognized as the standard method for performing a leak test on fire extinguishers because it effectively identifies leaks in the hoses, nozzles, and body of the extinguisher. This method involves applying a soap solution to the areas of concern and observing if bubbles form, which indicates escaping gas or liquid. This visual cue makes it straightforward to locate leaks without needing specialized equipment.

While visual inspection, pressure gauge reading, and functional tests are important aspects of fire extinguisher maintenance and evaluation, they do not focus specifically on detecting leaks. A visual inspection helps assess the overall condition of the extinguisher, a pressure gauge reading can indicate whether the extinguisher is pressurized properly, and a functional test verifies that the extinguisher operates correctly when used. However, none of these methods reliably pinpoint leaks the way a soapy water test does.