What safety feature is required on gas lines to prevent accidental fire or explosion during pressure testing?

Prepare for the Maine Gas Exam with our comprehensive quiz. Use flashcards and multiple choice questions, each featuring hints and explanations, to ace your test!

The requirement to use a non-combustible medium is vital during pressure testing of gas lines to prevent accidents such as fires or explosions. When conducting pressure tests, the integrity of the gas line must be confirmed without introducing any risk of igniting gas. A non-combustible medium, such as water or a specific non-combustible testing fluid, ensures that even if there is a release or leak of gas, the risk of ignition is significantly reduced, thus enhancing the safety of the testing process.

Other options, while they might enhance overall safety in specific contexts, do not specifically address the unique hazards associated with pressure testing gas lines. For example, protective barriers can help shield workers but do not mitigate the inherent risks of combustible gas directly involved in pressure tests. The installation of shut-off valves adds a layer of control but does not prevent gas from escaping if there is a failure during the test. Venting of gas is usually a procedural requirement in different contexts but does not incorporate a non-combustible medium which directly addresses the fire or explosion risk during pressure testing.

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