scope:

Applicability.

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

Coverage of piping systems shall extend from the point of delivery to the appliance connections. For other than undiluted liquefied petroleum gas (LP-Gas) systems, the point of delivery shall be considered to be the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where no meter is provided. For undiluted LP-Gas, the point of delivery shall be considered to be the outlet of the final pressure regulator, exclusive of line gas regulators, in the system.

The maximum operating pressure shall be 125 psi (862 kPa).

Exception No. 1: Piping systems for gas-air mixtures within the flammable range are limited to a maximum pressure of 10 psi (69 kPa).

Exception No. 2: LP-Gas piping systems are limited to 20 psi (140 kPa), except as provided in 5.5.2.

Requirements for piping systems shall include design, materials, components, fabrication, assembly, installation, testing, inspection, operation, and maintenance.

Requirements for appliances, equipment, and related accessories shall include installation, combustion, and ventilation air and venting.

This code shall not apply to the following items (reference standards for some of which appear in Annex M):

Portable LP-Gas appliances and equipment of all types that are not connected to a fixed fuel piping system

Installation of farm appliances and equipment such as brooders, dehydrators, dryers, and irrigation equipment

Raw material (feedstock) applications except for piping to special atmosphere generators

Oxygen-fuel gas cutting and welding systems

Industrial gas applications using such gases as acetylene and acetylenic compounds, hydrogen, ammonia, carbon monoxide, oxygen, and nitrogen

Petroleum refineries, pipeline compressor or pumping stations, loading terminals, compounding plants, refinery tank farms, and natural gas processing plants

Large integrated chemical plants or portions of such plants where flammable or combustible liquids or gases are produced by chemical reactions or used in chemical reactions

LP-Gas installations at utility gas plants

Liquefied natural gas (LNG) installations

Fuel gas piping in electric utility power plants

Proprietary items of equipment, apparatus, or instruments such as gas generating sets, compressors, and calorimeters

LP-Gas equipment for vaporization, gas mixing, and gas manufacturing

LP-Gas piping for buildings under construction or renovations that is not to become part of the permanent building piping system-that is, temporary fixed piping for building heat

Installation of LP-Gas systems for railroad switch heating

Installation of LP-Gas and compressed natural gas (CNG) systems on vehicles

Gas piping, meters, gas pressure regulators, and other appurtenances used by the serving gas supplier in distribution of gas, other than undiluted LP-Gas

Building design and construction, except as specified herein

Fuel gas systems on recreational vehicles manufactured in accordance with NFPA 1192, Standard on Recreational Vehicles

Fuel gas systems using hydrogen as a fuel

Construction of appliances