NFPA 54/ANSI Z223.1:2024

Chapter 1 Administration
1.1 Scope.
1.2 Purpose. (Reserved)
1.3 Retroactivity.
1.4 Equivalency.
1.5 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
4.1 Qualified Agency.
4.2 Interruption of Service.
4.3 Prevention of Accidental Ignition.
4.4 Noncombustible Material.
4.5 Engineering Methods.
Chapter 5 Gas Piping System Design, Materials, and Components
5.1 Piping Plan.
5.2 Interconnections Between Gas Piping Systems.
5.3 Sizing of Gas Piping Systems.
5.4 Operating Pressure.
5.5 Piping Materials and Joining Methods.
5.6 Gas Meters.
5.7 Gas Pressure Regulators.
5.8 Overpressure Protection.
5.9 Back Pressure Protection.
5.10 Low-Pressure Protection.
5.11 Shutoff Valves.
5.12 Excess Flow Valve(s).
5.13 Expansion and Flexibility.
5.14 Pressure Regulator and Pressure Control Venting.
Chapter 6 Pipe Sizing
6.1 Pipe Sizing Methods.
6.2 Sizing Natural Gas Piping Systems.
6.3 Sizing Propane Piping Systems.
6.4 Sizing Equations.
Chapter 7 Gas Piping Installation
7.1 Installation of Underground Piping.
7.2 Installation of Aboveground Piping.
7.3 Concealed Piping in Buildings.
7.4 Piping in Vertical Chases.
7.5 Gas Pipe Turns.
7.6 Drips and Sediment Traps.
7.7 Outlets.
7.8 Manual Gas Shutoff Valves.
7.9 Prohibited Devices.
7.10 Systems Containing Gas–Air Mixtures Outside the Flammable Range.
7.11 Systems Containing Flammable Gas–Air Mixtures.
7.12 Electrical Bonding and Grounding.
7.13 Electrical Circuits.
7.14 Electrical Connections.
Chapter 8 Inspection, Testing, and Purging
8.1 Pressure Testing and Inspection.
8.2 Piping System Leak Check.
8.3 Purging Requirements.
Chapter 9 Appliance, Equipment, and Accessory Installation
9.1 General.
9.2 Accessibility and Clearance.
9.3 Air for Combustion and Ventilation.
9.4 Appliances on Roofs.
9.5 Appliances in Attics.
9.6 Appliance and Equipment Connections to Building Piping.
9.7 Electrical.
9.8 Room Temperature Thermostats.
Chapter 10 Installation of Specific Appliances
10.1 General.
10.2 Air-Conditioning Appliances.
10.3 Central Heating Boilers and Furnaces.
10.4 Clothes Dryers.
10.5 Conversion Burners.
10.6 Decorative Appliances for Installation in Vented Fireplaces.
10.7 Gas Fireplaces, Vented.
10.8 Direct Gas-Fired Heating and Forced Ventilation Appliances.
10.9 Duct Furnaces.
10.10 Floor Furnaces.
10.11 Food Service Appliance, Floor-Mounted.
10.12 Food Service Appliances, Counter Appliances.
10.13 Household Cooking Appliances.
10.14 Illuminating Appliances.
10.15 Incinerators, Commercial-Industrial.
10.16 Infrared Heaters.
10.17 Open-Top Broiler Units.
10.18 Outdoor Cooking Appliances.
10.19 Pool Heaters.
10.20 Refrigerators.
10.21 Room Heaters.
10.22 Stationary Gas Engines.
10.23 Gas-Fired Toilets.
10.24 Unit Heaters.
10.25 Wall Furnaces.
10.26 Water Heaters.
10.27 Compressed Natural Gas (CNG) Vehicular Fuel Systems.
10.28 Appliances for Installation in Manufactured Housing.
10.29 Fuel Cell Power Plants.
10.30 Outdoor Open Flame Decorative Appliances.
10.31 Outdoor Infrared Heaters.
Chapter 11 Procedures to Be Followed to Place Appliance in Operation
11.1 Adjusting the Burner Input.
11.2 Primary Air Adjustment.
11.3 Safety Shutoff Devices.
11.4 Automatic Ignition.
11.5 Protective Devices.
11.6 Checking the Draft.
11.7 Operating Instructions.
Chapter 12 Venting of Appliances
12.1 Minimum Safe Performance.
12.2 General.
12.3 Specification for Venting.
12.4 Design and Construction.
12.5 Type of Venting System to Be Used.
12.6 Masonry, Metal, and Factory-Built Chimneys.
12.7 Gas Vents.
12.8 Single-Wall Metal Pipe.
12.9 Through-the-Wall Vent Termination.
12.10 Condensation Drain.
12.11 Vent Connectors for Category I Appliances.
12.12 Vent Connectors for Category II, Category III, and Category IV Appliances.
12.13 Draft Hoods and Draft Controls.
12.14 Manually Operated Dampers.
12.15 Automatic Vent Damper.
12.16 Obstructions.
Chapter 13 Sizing of Category I Venting Systems
13.1 Additional Requirements to Single Appliance Vent.
13.2 Additional Requirements to Multiple-Appliance Vent.
Annex A Explanatory Material
Annex B Sizing and Capacities of Gas Piping
Annex C Suggested Method of Checking for Leakage
Annex D Suggested Emergency Procedure for Gas Leaks
Annex E Flow of Gas Through Fixed Orifices
Annex F Sizing of Venting Systems Serving Appliances Equipped with Draft Hoods, Category I Appliances, and Appliances Listed for Use with Type B Vents
Annex G Recommended Procedure for Safety Inspection of an Existing Appliance Installation
Annex H Indoor Combustion Air Calculation Examples
Annex I Example of Combination of Indoor and Outdoor Combustion and Ventilation Opening Design
Annex J Enforcement
Annex K Informational References

This code is a safety code that shall apply to the instal‐ lation of fuel gas piping systems, appliances, equipment, and related accessories as shown in 1.1.1.1(A) through 1.1.1.1(F).