scope:

This standard applies to: (a) The installation of fuel gas piping systems for industrial installations at any gas pressure and of all other fuel gas piping systems operating at pressures greater than 1/2 psig - from the outlet of the gas supplier's meter set assembly, or the outlet of the service regulator if a meter is not provided, to the inlet connections of gas utilizing equipment.

(b) The installation of piping systems containing gasair mixtures within the flammable range for use at pressures of 10 psig or less.

(c) The installation and maintenance of fuel gas utilizing equipment.

This standard does not apply to:

(a) Gas piping and appliance installations covered by American National Standard Installation of Gas Appliances and Gas Piping, 221.30-1964,* or NFPA No. 54-1969, Installation of Gas Appliances and Gas Piping.**

(b) Portable LP-Cas equipment of all types which are not connected to a fixed fuel piping system, such as plumbers'