When is a gas test necessary?

A gas test is necessary any time there is a suspicion of gas presence, such as when you smell gas or suspect that you have hit a gas line. This is essential for safety, as gas leaks can pose significant risks, including explosion hazards and health risks due to inhalation. Conducting a gas test in these situations helps to ensure that the area is safe for personnel and equipment before proceeding with work. This protocol is crucial for preventing accidents and ensuring compliance with safety regulations.

In contrast, the other choices do not adequately represent when a gas test should be performed. For example, a gas test is not limited only to demolition work, as there are many scenarios beyond demolition where gas lines may be disturbed or leaks may occur. While routine site checks are important for general safety and maintenance, they do not specifically address the need for gas testing unless there is an indication of a gas issue. Similarly, performing a gas test before every operation may be overly broad, as it is primarily necessary in response to specific conditions, such as the detection of a gas smell or a concern regarding gas lines.