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

Help improve safety and maintain compliance when designing, installing, and maintaining fuel gas systems with NFPA 54/ANSI Z223.1, National Fuel Gas Code.

NFPA 54 is an essential resource for industries including construction, fuel distribution, manufacturing, building operations, food service, health care, and alternative energy. The code provides comprehensive requirements to help support safe fuel gas system installation, operation, maintenance, inspection, and testing across residential, commercial, and industrial occupancies.

From the risks of carbon monoxide poisoning to potential fire and explosion hazards, NFPA 54 helps professionals mitigate dangers associated with gaseous fuels by establishing requirements for gas piping systems, appliances, venting systems, inspection, leak checks, purging procedures, and combustion safety.

Who Uses NFPA 54?

NFPA 54 is relied upon by professionals responsible for fuel gas system safety and compliance, including:

• Engineers
• HVAC technicians
• Facility managers
• Maintenance supervisors
• Utility professionals
• Fire marshals
• Code inspectors and authorities having jurisdiction (AHJs)

These users depend on NFPA 54 to help maintain safe and code-compliant fuel gas systems across a wide range of applications and occupancies.

Key Topics Covered

NFPA 54 provides requirements covering:

• Piping system design, materials, and components
• Pipe sizing and installation for underground, aboveground, and concealed spaces
• Piping inspection, testing, leak checks, and purging procedures
• Process air and appliance installation requirements
• Minimum safe performance criteria and specifications for venting combustion products

Highlights

The 2021 edition of NFPA 54 features significant changes and additions reflecting current equipment, practices, materials, and technologies, including:

• Updated minimum safe performance criteria, general requirements, and specifications for venting combustion products
• Revisions in Chapter 10 requiring appliances to be listed and compliant with the appropriate ANSI/CSA appliance listing standards
• Addition of a new table in Chapter 12 covering through-the-wall vent terminal clearances, along with an annex figure coordinating code requirements with ANSI product standards
• New definition of engineering methods in Chapter 4 to provide guidance to authorities having jurisdiction (AHJs) regarding acceptable engineering approaches
• Revised and reorganized electrical isolation requirements for gas piping installations, clarifying dielectric union placement and system protection requirements

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