2021 NFPA 54/ANSI Z223.1 National Fuel Gas Code

NFPA 54/ANSI Z223.1, National Fuel Gas Code 2021 edition establishes the mandatory requirements for the safe design, installation, operation, maintenance, purging, and inspection of fuel gas piping systems, equipment, accessories, and appliances in residential, commercial, and industrial buildings. This reference addresses the full range of hazards associated with gaseous fuels — including fire, explosion, and carbon monoxide risks — and is the primary code relied on by mechanical engineers, plumbing contractors, gas system designers, and inspectors responsible for fuel gas system compliance.

What NFPA 54 Covers

• Piping system design, materials, and component selection.
• Pipe sizing and installation requirements for underground, aboveground, and concealed space applications.
• Piping inspection, testing, system leak checks, and purging procedures.
• Requirements for process air and appliance installation.
• Minimum safe performance criteria, general requirements, and specifications for venting combustion products.

Who Uses NFPA 54

The 2021 edition is the standard of reference for mechanical engineers, plumbing and gas contractors, building inspectors, and authority having jurisdiction (AHJ) officials responsible for the design, installation, and inspection of fuel gas systems in residential, commercial, and industrial settings.

What's New in the 2021 Edition

The 2021 edition introduces significant technical updates, including:

• Revised Chapter 10 requiring appliances to be listed and in compliance with the appropriate ANSI/CSA appliance listing standard.
• New through-the-wall vent terminal clearance table added to Chapter 12, with an associated annex figure coordinating clearances with applicable ANSI product standards.
• New definition of engineering methods in Chapter 4 providing guidance to authorities having jurisdiction on acceptable methods, removing the requirement to individually approve each engineering method used.
• Revised and reorganized electrical isolation requirements for gas piping installation, clarifying where dielectric unions are to be installed and what they are protecting in the system.

Stay compliant with the fuel gas code relied on by mechanical engineers, contractors, and inspectors across residential, commercial, and industrial applications.

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