NFPA 54:National Fuel Gas Code, 2018 Edition

The 2019 Edition of the NFPA 54/ANSI Z223.1: National Fuel Gas Code contains the most up-to-date information on safe installation and operation of fuel gas piping systems as well as accessories, equipment, and appliances. New to the 2019 edition is information that will give you more confidence and trust in CSST bonding. There are new sections on piing requirements and revisions related to arc-resistant jacket or coated CSST.

Table of Contents
Annex A Explanatory Material

1. Administration
   1. Scope
   2. Purpose
   3. Retroactivity
   4. Equivalency
   5. Enforcement

2. Referenced Publications
   1. General
   2. NFPA Publications
   3. Other Publications
   4. References for Extracts in Mandatory Sections

3. Definitions
   1. General
   2. NFPA Official Definitions
   3. General Definitions

4. General
   1. Qualified Agency
   2. Interruption of Service
   3. Prevention of Accidental Ignition
   4. Noncombustible Material

5. Gas Piping System Design, Materials, and Components
   1. Piping Plan
   2. Provision for Location of Point of Delivery
   3. Interconnections Between Gas Piping Systems
   4. Sizing of Gas Piping Systems
   5. Operating Pressure
   6. Acceptable Piping Materials and Joining Methods
   7. Gas Meters
   8. Gas Pressure Regulators
   9. Overpressure Protection Devices
   10. Back Pressure Protection
   11. Low-Pressure Protection
   12. Shutoff Valves
   13. Excess Flow Valve(s)
   14. Expansion and Flexibility

6. Pipe Sizing
   1. Pipe Sizing Methods
   2. Sizing Natural Gas Piping Systems
   3. Sizing Propane Piping Systems
   4. Sizing Equations

7. Gas Piping Installation
   1. Installation of Underground Piping
   2. Installation of Aboveground Piping
   3. Concealed Piping in Buildings
   4. Piping in Vertical Chases
   5. Gas Pipe Turns
   6. Drips and Sediments Traps
   7. Outlets
   8. Manual Gas Shutoff Valves
   9. Prohibited Devices
   10. Systems Containing Gas – Air Mixtures Outside the Flammable Range
   11. Systems Containing Flammable Gas – Air Mixtures
   12. Electrical Bonding and Grounding
   13. Electrical Circuits
   14. Electrical Connections

8. Inspection, Testing, and Purging
   1. Pressure Testing and Inspection
   2. Piping System Leak Check
   3. Purging Requirements

9. Appliance, Equipment, and Accessory Installation
   1. General
   2. Accessibility and Clearance
   3. Air for Combustion and Ventilation
   4. Appliances on Roofs
   5. Appliances in Attics
   6. Appliance and Equipment Connections to Building Piping
   7. Electrical
   8. Room Temperature Thermostats

10. Installation of Specific Appliances
    1. General
    2. Air-Conditioning Appliances (Gas-Fired Air Conditioners and Heat Pumps)
    3. Central Heating Boilers and Furnaces
    4. Clothes Dryers
    5. Conversion Burners
    6. Decorative Appliance for Installation in Vented Fireplaces
    7. Gas Fireplaces, Vented
    8. Non-Recirculating Direct Gas-Fired Industrial Air Heaters
    9. Duct Furnaces
    10. Floor Furnaces
    11. Food Service Appliance, Floor-Mounted
    12. Food Service Appliances, Counter Appliances
    13. Household Cooking Appliances
    14. Illuminating Appliances
    15. Incinerators, Commercial-Industrial
    16. Infrared Heaters
    17. Open-Top Broiler Units
    18. Outdoor Cooking Appliances
    19. Pool Heaters
    20. Refrigerators
    21. Room Heaters
    22. Stationary Gas Engines
    23. Gas-Fired Toilets
    24. Unit Heaters
    25. Wall Furnaces
    26. Water Heaters
    27. Compressed Natural gas (CNG) Vehicular Fuel Systems
    28. Appliances for Installation in Manufactured Housing
    29. Fuel Cell Power Plants
    30. Outdoor Open Flame Decorative Appliances

11. Procedures to be Followed to Place Appliances in Operation
    1. Adjusting the Burner Input
    2. Primary Air Adjustment
    3. Safety Shutoff Devices
    4. Automatic Ignition
    5. Protective Devices
    6. Checking the Draft
    7. Operating Instruction

12. Venting of Appliances
    1. Minimum Safe Performance
    2. General
    3. Specification for Venting
    4. Design and Construction
    5. Type of Venting System to be Used
    6. Masonry, Metal, and Factory-Built Chimneys
    7. Gas Vents
    8. Single-Wall Metal Pipe
    9. Through-the-Wall Vent Termination
    10. Condensation Drain
    11. Vent Connectors for Category I Appliances
    12. Vent Connectors for Category II, Category III, and Category IV Appliances
    13. Draft Hood and Draft Controls
    14. Manually Operated Dampers
    15. Automatically Operated Vent Dampers
    16. Obstructions

13. Sizing of Category I Venting Systems
    1. Additional Requirements to Single Appliance Vent
    2. Additional Requirements to Multiple-Appliance Vent

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