NFPA 51:2023

Chapter 1 Administration 1.1 Scope. 1.2 Purpose. 1.3 Retroactivity. 1.4 Equivalency. 1.5 Fuel Gases in the Liquid Phase. 1.6 Operations and Fire Prevention Practices. 1.7 Material–Oxygen Compatibility. 1.8 Cylinders and Containers. 1.9 Units and Formulas. 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 Cylinders and Containers 4.1 Fire Testing. 4.2 Fabrication and Marking. 4.3 Cylinder Storage and Use — General. 4.4 Fuel Gas Cylinder Storage. 4.5 Oxygen Cylinder Storage. 4.6 Gas Cabinets. 4.7 Exhausted Enclosures. 4.8 Gas Rooms. Chapter 5 Manifolding of Cylinders Chapter 5 Manifolding of Cylinders 5.1 Fuel Gas Manifolds. 5.2 High-Pressure Oxygen Manifolds. 5.3 Low-Pressure Oxygen Manifolds. 5.4 Portable Outlet Headers. Chapter 6 Piping Systems 6.1 Materials and Design. 6.2 Piping Joints. 6.3 Installation. 6.4 Cleaning. 6.5 Testing. 6.6 Painting and Signs. Chapter 7 Protective Equipment, Hose, and Regulators 7.1 General. 7.2 Pressure Relief for Piping Systems. 7.3 Piping Protective Equipment. 7.4 Station Outlet Protective Equipment. 7.5 Hose and Hose Connections. 7.6 Pressure-Reducing Regulators. Chapter 8 Acetylene Generators 8.1 Listing and Marking. 8.2 Rating and Pressure Limitations. 8.3 Location. 8.4 Stationary Acetylene Generators (Automatic and Nonautomatic). 8.5 Outside Generator Houses and Inside Generator Rooms for Stationary Acetylene Generators. Chapter 9 Calcium Carbide Storage 9.1 Packaging. 9.2 Storage in Buildings. 9.3 Storage Outside Buildings. Chapter 10 Mobile Acetylene Trailer Systems 10.1 General Provisions. 10.2 Discharge Stations at Consumer Sites. 10.3 Indoor Discharge Stations. 10.4 Instructions. 10.5 Fire Protection. Annex A Explanatory Material Annex B Informational References

This standard applies to the following: (1) Design and installation of oxygen–fuel gas welding and cutting systems and allied processes (see 3.3.2), except for systems meeting the criteria in 1.1.5 (2) Utilization of gaseous fuels generated from flammable liquids under pressure where such fuels are used with oxygen (3) Storage on the site of a welding and cutting system instal‐ lation of the following: (a) Gases to be used with such systems where more than one cylinder each of oxygen and fuel gas are stored in any single storage area [includes storage of more than one cylinder each in any single storage area even though all such stored cylinders may be inten‐ ded for use in systems of the kind described in 1.1.1(1)] (b) Calcium carbide