Why is it important to avoid using a flame to check for leaks?

Avoiding the use of a flame to check for leaks is essential primarily because a flame can ignite flammable gases, such as LPG or CNG, leading to a potential explosion or fire. When gas escapes from a leak, it can accumulate in an area, and introducing a flame into that environment creates an immediate risk of ignition. This hazardous situation underscores the fundamental safety practice of using non-flame methods, such as soapy water, to detect leaks. Non-combustible methods allow for a safe assessment of the surroundings without the dangerous consequences associated with open flames.

While the other options highlight various concerns, such as the potential for false readings or equipment damage, the paramount reason remains the immediate danger posed by introducing a flame into the presence of flammable gases. Therefore, recognizing the critical safety implications of this practice ensures both the safety of personnel and the integrity of the equipment being inspected.