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NFPA 54/ANSI Z223.1: National Fuel Gas Code, 2021
- Important Notices and Disclaimers
- Additional Important Notices and Disclaimers
- Chapter 1 Administration [Go to Page]
- 1.1 Scope.
- 1.2 Purpose.
- 1.3 Retroactivity.
- 1.4 Equivalency.
- 1.5 Enforcement.
- Chapter 2 Referenced Publications [Go to Page]
- 2.1 General.
- 2.2 NFPA Publications.
- 2.3 Other Publications.
- 2.4 References for Extracts in Mandatory Sections.
- Chapter 3 Definitions [Go to Page]
- 3.1 General.
- 3.2 NFPA Official Definitions.
- 3.3 General Definitions.
- Chapter 4 General [Go to Page]
- 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 [Go to Page]
- 5.1 Piping Plan.
- 5.2 Interconnections Between Gas Piping Systems.
- 5.3 Sizing of Gas Piping Systems.
- 5.4 Operating Pressure.
- 5.5 Acceptable Piping Materials and Joining Methods.
- 5.6 Gas Meters.
- 5.7 Gas Pressure Regulators.
- 5.8 Overpressure Protection Devices.
- 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 [Go to Page]
- 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 [Go to Page]
- 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 [Go to Page]
- 8.1 Pressure Testing and Inspection.
- 8.2 Piping System Leak Check.
- 8.3 Purging Requirements.
- Chapter 9 Appliance, Equipment, and Accessory Installation [Go to Page]
- 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 [Go to Page]
- 10.1 General.
- 10.2 Air-Conditioning Appliances (Gas-Fired Air Conditioners and Heat Pumps).
- 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 Non-Recirculating Direct Gas-Fired Industrial Air HeatersHeating 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 [Go to Page]
- 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 [Go to Page]
- 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 Automatically Operated Vent Dampers.
- 12.16 Obstructions.
- Chapter 13 Sizing of Category I Venting Systems [Go to Page]
- 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 [Go to Page]
