A gas valve that has been shut off must not be reopened until?

A gas valve that has been shut off requires inspection by a qualified person before it can be reopened to ensure safety. This inspection is crucial because it helps identify any potential hazards, such as leaks, improper functioning of the system, or any other issues that may have caused the valve to be closed in the first place. A qualified person has the necessary training and experience to assess the condition of the gas system comprehensively.

Once inspected and deemed safe, the valve may be reopened, which helps avoid the risk of accidents or dangerous situations such as gas leaks or explosions. This protocol also aligns with safety regulations and best practices in the field, emphasizing the importance of professional evaluation prior to reintegrating a system into normal operation.