Red Seal Gasfitter — Class A Practice Exam

Which method is appropriate for testing for gas leaks in piping?

1. Using a pressure gauge

2. Using a soap solution or a gas leak detector

3. Visual inspection only

4. Using a thermometer

The correct answer is: Using a soap solution or a gas leak detector

The method of using a soap solution or a gas leak detector is appropriate for testing for gas leaks in piping because it allows for clear visibility of escaping gas. Soap solutions create bubbles when gas is present, effectively indicating any leaks, even small ones that might not be detectable through other means. This method is widely used because it is straightforward and reliable, making it a standard practice within the industry. In contrast, while a pressure gauge can determine if there’s a pressure drop in the system that may suggest a leak, it does not specifically identify the location of the leak. Visual inspection alone may not be comprehensive enough to detect gas leaks, especially in concealed areas. Additionally, a thermometer is not suitable for testing gas leaks, as it measures temperature rather than detecting the presence of gas. Therefore, the use of a soap solution or gas leak detector is the most effective and widely accepted method to ensure safety in gas piping systems.