What must be marked on a gas shutoff valve according to NFPA 54?

According to NFPA 54, which deals with the National Fuel Gas Code, it is essential for a gas shutoff valve to have markings indicating the directional flow of the gas. This is crucial for several reasons. Firstly, it provides clear guidance to users and technicians on how to operate the valve properly, ensuring that the gas flows in the intended direction when the system is activated. This not only promotes safe operation but also helps prevent accidents that may arise from improper use.

Understanding the directional flow is particularly important during maintenance or emergency situations, where knowing how to shut off the gas quickly can avert potential hazards. Properly marking the valve aids in maintaining compliance with safety standards and ensures that all personnel who interact with the gas system can do so with greater confidence and knowledge.

Marks such as the date of installation, pressure rating, or manufacturer’s name, while informative and useful for other aspects of system management and compliance, are not specifically mandated by NFPA 54 for the operation of the valve itself. The emphasis on directional flow marking highlights the practical need for immediate and clear operation instructions for users of gas systems.