scope:

The scope defines the application (and nonapplication) of NFPA 54/ANSI Z223.1. The scope is important because users of this or any code must know whether or not the right document is being used.

Applicability.

The National Fuel Gas Code is the American National Standard that applies to the installation of fuel gas piping systems and equipment and appliances that are supplied with natural gas; manufactured gas; liquefied petroleum gas (LP-Gas) in the vapor phase only; LP-Gas-air mixtures; mixtures of these gases; and gas-air mixtures in the flammable range.

Natural gas, as its name implies, is a naturally occurring product found in many parts of the world. It is recovered by drilling wells into underground pockets of natural gas. The recovered gas is piped to homes and businesses via collection, cleanup, transmission, and utility distribution piping. Another source of natural gas is synthetic natural gas, which is produced by cracking naphtha or other chemical feedstocks to supplement natural gas supplies. Under suitable conditions of elevated pressure and low temperature, natural gas can be liquefied to reduce its volume for purposes of storage or transportation. Liquefied natural gas (LNG) is the source of a larger amount of the natural gas used in North America over the last 5 years, and it appears it will have a larger share in the foreseeable future. The increased use of LNG will have minimal impact on this code, as the gas being delivered to homes and businesses remains the same.