For leak testing piping that carries ammonia, which test method is mentioned?

• A. Ammonia sniffer
• B. Halogen torch
• C. Soap bubbles
• D. Electronic leak detector

Answer: (C)

The test method being described is a visual leak test using soap bubbles. In this approach, the piping is pressurized to a specified test pressure and a soap solution is brushed onto joints, flanges, and welds. If there is any leak, escaping gas creates bubbles at the leak site, providing an obvious, localized indication of where a seal or connection is failing. This method is practical for ammonia piping because it is simple, inexpensive, and doesn’t rely on specialized sensors or calibration. It also gives immediate, site-specific feedback, which helps you identify and fix leaks quickly.

Ammonia sniffers detect ammonia in the surrounding air and aren’t a direct test of the pipe’s integrity; they indicate presence of gas in the area rather than pinpointing a leak path in a system. A halogen torch is intended for detecting leaks in halogenated compounds and isn’t suitable for ammonia. An electronic leak detector may sense ammonia, but it can be less reliable for localized pipe leaks and requires proper calibration and sensor maintenance. The soap bubble method provides a clear, direct indication of leaks in the piping itself, making it the best fit for this scenario.