NFPA 55: Compressed Gases and Cryogenic Fluids Code
Current Edition: 2013 Next Edition: 2016

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What is NFPA 55?
NFPA 55: Document Scope
1.1 Scope. 1.1.1 Applicability. This code shall apply to the installation, storage, use, and handling of compressed gases and cryogenic fluids in portable and stationary containers, cylinders, equipment, and tanks in all occupancies. 1.1.2 Specific Applications. This code shall not apply to the following: (1)*Off-site transportation of materials covered by this code. (2) Storage, use, and handling of radioactive gases in accordance with NFPA 801, Standard for Fire Protection for Facilities Handling Radioactive Materials. (3)*Use and handling of medical compressed gases at health care facilities in accordance with NFPA 99, Standard for Health Care Facilities. (4) Systems consisting of cylinders of oxygen and cylinders of fuel gas used for welding and cutting in accordance with NFPA 51, Standard for the Design and Installation of Oxygen–Fuel Gas Systems forWelding, Cutting, and Allied Processes. (5) Acetylene cylinders in acetylene cylinder charging plants in accordance with NFPA 51A, Standard for Acetylene Cylinder Charging Plants. (6)*Flammable gases used as a vehicle fuel when stored on a vehicle. (7)*Storage, use, and handling of liquefied and nonliquefied compressed gases in laboratory work areas in accordance with NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals. (8) Storage, use, and handling of liquefied petroleum gases in accordance with NFPA 58, Liquefied Petroleum Gas Code. (9) Storage, use, and handling of gases within closed-cycle refrigeration systems complying with the mechanical code. (10) Liquefied natural gas (LNG) storage at utility plants under NFPA 59A, Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG). (11) Compressed natural gas (CNG), liquefied natural gas (LNG), compressed hydrogen gas (GH2), or liquefied hydrogen gas (LH2) handled as a vehicle fuel in accordance with NFPA 52, Vehicular Gaseous Fuel Systems Code. Where a bulk hydrogen system is intended for vehicular fueling applications, the applicable provisions of NFPA 52 required for fuel dispensing operations shall be required in addition to the requirements of this code. (12) Nonflammable mixtures of ethylene oxide with other chemicals. (13) Ethylene oxide in chambers 10 ft3 (0.283 m3) or less in volume or for containers holding 7.05 oz (200 g) of ethylene oxide or less.
NFPA 55 facilitates protection from physiological, over-pressurization, explosive, and flammability hazards associated with compressed gases and cryogenic fluids. Official document scope
What does NFPA 55 address?
Criteria provide fundamental safeguards for the installation, storage, use, and handling of compressed gases and cryogenic fluids in portable and stationary cylinders, containers, and tanks in all occupancy types. Table of Contents

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