What safety practice should be followed when checking for leaks in gas pipes?

The practice of applying soap and water to check for leaks in gas pipes is a widely accepted and safe method. When soap is applied to a potential leak, any escaping gas will create bubbles. The presence of bubbles indicates that gas is leaking from the joint or pipe, allowing the technician to identify the exact location of the leak quickly and effectively. This method is advantageous because it does not involve any ignition sources, making it safer than other methods.

Using a flame to check for leaks is extremely dangerous since igniting gas can lead to explosions and fire hazards. Scenting the air for gas odor is not always reliable, as not all gas types have a scent, and the odor might not be detectable in every situation. Pressure testing with water can be a more complex process and is typically used to ensure the integrity of water systems rather than gas lines. Thus, the use of soap and water remains the safest and most effective choice for detecting gas leaks.