NFPA 55:2023

Chapter 1 Administration 1.1 Scope. 1.2 Purpose. 1.3 Application. 1.4 Conflicts. 1.5 Retroactivity. 1.6 Equivalency. 1.7 Units and Formulas. 1.8 Enforcement. Chapter 2 Referenced Publications 2.1 General. 2.2 NFPA Publications. 2.3 Other Publications. 2.4 References for Extracts in Mandatory Sections. Chapter 3 Definitions 3.1 General. 3.2 NFPA Official Definitions. 3.3 General Definitions.Chapter 4 General Requirements 4.1 Permits. 4.2 Emergency Plan. 4.3 Facility Closure. 4.4 Out-of-Service Stationary Bulk Gas Systems. 4.5 Management Plan and Hazardous Materials Documentation. 4.6 Release of Hazardous Materials. 4.7 Personnel Training. 4.8 Emergency Response Liaison. 4.9 Ignition Source Controls. 4.10 Signs. 4.11 Protection from Vehicular Damage. 4.12 Building Construction Materials. Chapter 5 Classification of Hazards 5.1 Hazardous Materials Classification.Chapter 6 Building-Related Controls 6.1 General. 6.2 Control Areas. 6.3 Occupancy Protection Levels. 6.4 Gas Rooms. 6.5 Hydrogen Gas Rooms. 6.6 Detached Buildings. 6.7 Weather Protection. 6.8 Electrical Equipment. 6.9 Employee Alarm System. 6.10 Explosion Control. 6.11 Fire Protection Systems. 6.12 Lighting. 6.13 Hazard Identification Signs. 6.14 Spill Control, Drainage, and Secondary Containment. 6.15 Shelving. 6.16 Vent Pipe Termination. 6.17 Ventilation. 6.18 Gas Cabinets. 6.19 Exhausted Enclosures. 6.20 Source Valve.Chapter 7 Compressed Gases 7.1 General. 7.2 Subatmospheric Gas Sources (SAGS). 7.3 Storage. 7.4 Use and Handling. 7.5 Medical Gas Systems. 7.6 Corrosive Gases. 7.7 Flammable Gases. 7.8 Oxidizing Gases. 7.9 Pyrophoric Gases. 7.10 Toxic and Highly Toxic Gases. 7.11 Unstable Reactive Gases (Nondetonable). 7.12 Subatmospheric Gas (Type 1 and Type 2) Sources.Chapter 8 Cryogenic Fluids 8.1 General. 8.2 Containers — Design, Construction, and Maintenance. 8.3 Pressure Relief Vent Piping. 8.4 Marking. 8.5 Security. 8.6 Separation from Hazardous Conditions. 8.7 Electrical Wiring and Equipment. 8.8 Service and Repair. 8.9 Unauthorized Use. 8.10 Leaks, Damage, and Corrosion. 8.11 Lighting. 8.12 Storage. 8.13 Use and Handling.Chapter 9 Bulk Oxygen Systems 9.1 General. 9.2 Materials of Construction. 9.3 Location of Bulk Oxygen Systems. 9.4 System Fabrication. 9.5 Inspection. Chapter 10 Gas Hydrogen Systems 10.1 Applicability. 10.2 General. 10.3 Hydrogen Systems Having Quantities Greater Than the MAQ. 10.4 Bulk Gaseous Hydrogen System. Chapter 11 Bulk Liquefied Hydrogen Systems 11.1 General. 11.2 Design of Bulk Liquefied Hydrogen Systems. 11.3 Location of Bulk Liquefied Hydrogen Systems. 11.4 Design Considerations at Specific Locations. 11.5 Cargo Transport Unloading.Chapter 12 Gas Generation Systems 12.1 General. 12.2 Corrosive Gases. (Reserved) 12.3 Flammable Gases — Cryogenic. (Reserved) 12.4 Oxidizing Gases. (Reserved) 12.5 Other Gases. (Reserved) 12.6 Pyrophoric Gases. (Reserved) 12.7 Toxic and Highly Toxic Gases. (Reserved) 12.8 Unstable Reactive Gases. (Reserved) Chapter 13 Carbon Dioxide Systems 13.1 General. 13.2 Uninsulated Carbon Dioxide Compressed Gas Systems. (Reserved) 13.3 Insulated Carbon Dioxide Compressed Gas Systems. 13.4 Insulated Liquid Carbon Dioxide Systems. 13.5 Materials of Construction. 13.6 Operating Instructions. 13.7 Small Insulated Liquid Carbon Dioxide Indoor Systems. 13.8 Small Insulated Liquid Carbon Dioxide Outdoor Systems. 13.9 Large Indoor Insulated Liquid Carbon Dioxide Systems. (Reserved) 13.10 Large Outdoor Insulated Liquid Carbon Dioxide Systems. 13.11 Carbon Dioxide Beverage Systems.Chapter 14 Storage, Handling, and Use of Ethylene Oxide for Sterilization and Fumigation 14.1 General. 14.2 Receiving and Unloading Ethylene Oxide Containers. 14.3 Storage of Ethylene Oxide. 14.4 Piping Systems. 14.5 Gas Dispensing Areas. 14.6 Operations. 14.7 Electrical Installation. 14.8 Sterilizer Construction. 14.9 Disposal and Emissions. 14.10 Maintenance. 14.11 Construction. 14.12 Fire Protection. Chapter 15 Acetylene Cylinder Charging Plants 15.1 General. 15.2 Location. 15.3 Building-Related Controls. 15.4 Design, Installation, and Testing. 15.5 Process Operations. 15.6 Maintenance. (Reserved) 15.7 Special Problems — Raw Materials.Chapter 16 Liquid Nitrous Oxide Systems 16.1 General. 16.2 Location of Bulk Nitrous Oxide Systems. 16.3 Container Design. 16.4 Container Installation. 16.5 Materials of Construction. 16.6 Vaporizers and Heaters. 16.7 Pumps. 16.8 Strainers and Filters. 16.9 Flow Meters. 16.10 Cleaning. 16.11 Maintenance Procedures. 16.12 Small Insulated Liquid Nitrous Oxide Indoor Systems. (Reserved)Chapter 17 Cryogenic Fluid Central Supply Systems for Health Care Facilities 17.1 General. 17.2 Cryogenic Fluid Central Supply Systems Installation. 17.3 Cryogenic Fluid Central Supply Systems Operation. 17.4 Main Supply System. 17.5 Reserve Supply System. 17.6 Cryogenic Fill System. 17.7 Vaporizers. 17.8 High-Pressure Manifolds. 17.9 Pressure Control Devices. 17.10 Pressure Relief Devices. 17.11 Tubing and Valves. 17.12 Alarms. Annex A Explanatory Material Annex B Attended Operations Annex C Physical Properties of Hydrogen Annex D Significant Properties of Ethylene Oxide Annex E Explanation of Methodology Utilized to Develop Separation Distances Annex F Sample Ordinance Adopting NFPA 55 Annex G OSHA Requirements for Hydrogen Systems Annex H Determination of Separation Distances for Bulk Gaseous Hydrogen Systems Annex I Informational References

This code shall provide fundamental safeguards for the installation, storage, use, and handling of compressed gases and cryogenic „uids in portable and stationary cylinders, containers, and tanks.