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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 cylinders, containers, 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 A.1.1.2(1) For regulations on the transportation of gases, see 49 CFR 100–185, “Transportation,” and Transportation of Dangerous Goods Regulations. (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, Health Care Facilities Code A.1.1.2(3) Bulk compressed gas and cryogenic fluid system installations are intended to be covered by the requirements of this code. Instrumentation and alarms that are attendant to the system and designed to interface with the application in a health care facility are to be retained within the purview of NFPA 99, Health Care Facilities Code. (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 for Welding, Cutting, and Allied Processes (5)*Flammable gases used as a vehicle fuel when stored on a vehicle. A.1.1.2(5) For information, see NFPA 52, Vehicular Gaseous Fuel Systems Code, or NFPA 58, Liquefied Petroleum Gas Code. (6)*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 A.1.1.2(6) The storage and use of compressed gases and cryogenic fluids outside the boundaries of laboratory work areas are covered by this code. (7) Storage, use, and handling of liquefied petroleum gases in accordance with NFPA 58, Liquefied Petroleum Gas Code. (8) Storage, use, and handling of compressed gases within closed-cycle refrigeration systems complying with the mechanical code (9) Liquefied natural gas (LNG) storage at utility plants under NFPA 59A, Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG) (10) Compressed natural gas (CNG) and liquefied natural gas (LNG) utilized as a vehicle fuel in accordance with NFPA 52, Vehicular Gaseous Fuel Systems Code (11)*Compressed hydrogen gas (GH2), or liquefied hydrogen gas (LH2) generated, installed, stored, piped, used, or handled in accordance with NFPA 2, Hydrogen Technologies Code, when there are no specific or applicable requirements in NFPA 55 A.1.1.2(11) NFPA 55 is used as the source document for the fundamental requirements for compressed hydrogen gas (GH2), or liquefied hydrogen gas (LH2) system installations. Correlation between NFPA 55 and NFPA 2, Hydrogen Technologies Code, is the responsibility of the two technical committees involved. The installation requirements for bulk GH2 or LH2 are viewed as fundamental provisions. On the other hand, usespecific requirements for designated applications such as vehicular fueling are not resident in NFPA 55 and are under the purview of the NFPA 2 Technical Committee. Where there are specific provisions or controls included in NFPA 55, the specific controls of NFPA 55 will govern except that modifications made to provisions that have been extracted can be followed when the modifications have been made within NFPA’s extract procedure as indicated in the Manual of Style for NFPATechnical Committee Documents. (12) Nonflammable mixtures of ethylene oxide with other chemicals (13) Ethylene oxide in chambers 10 scf (0.283 Nm3) 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.
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.
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