NFPA 55 governs which type of systems?

• A. NFPA 45
• B. CGA 50
• C. CGA 55
• D. NFPA 55

Answer: (D)

NFPA 55 governs systems for the storage, use, and handling of compressed gases and cryogenic fluids. It covers the design, installation, operation, and maintenance of facilities and equipment that contain or move gases—things like rooms and cabinets, piping, cylinders, regulators, valves, relief devices, ventilation, and detection systems. The goal is to prevent leaks, fires, asphyxiation, and overpressure by setting safe practices for storage, transfer, and use of these gases. The other standards mentioned pertain to different topics (such as lab fire protection or separate industry guidelines) and do not provide the comprehensive code for compressed gas and cryogenic fluid systems.