Structures converting piping and gas equipment from use of butane or other liquefied petroleum gases to natural gas shall be altered as follows:
(1) All piping previously installed shall otherwise conform to the specification and construction standards adopted in § 12-405.
(2) Before a gas supply is furnished by the supplier, the orifices of all liquefied petroleum gas appliances shall be changed or altered to sizes and methods of use recommended by the manufacturer of the appliance. Vent pipes, heater connections, or any other appurtenances to gas appliances in use prior to conversion from liquefied gas to natural gas, shall be altered or replaced in a manner that will conform to the specifications adopted in § 12-405.
(1970 Code, § 4-406)