What is the purpose of the pressure relief valve mentioned in NFPA 52?

The pressure relief valve serves a critical safety function by preventing pressure within a system from exceeding safe limits. In the context of NFPA 52, which covers the storage, handling, and use of compressed natural gas (CNG), this valve is designed to release gas when the pressure reaches a predetermined threshold. This action helps to avert potential hazards such as ruptures or explosions that could result from overpressure situations.

By allowing the controlled release of gas, the valve ensures that systems remain within operational safety margins, thereby protecting equipment, drivers, and the surrounding environment. This feature is vital in maintaining the integrity of storage tanks and associated infrastructure that handle CNG, emphasizing the importance of safety protocols in the transportation and distribution of natural gas.