scope:

This code shall apply to the design, installation, operation, and maintenance of compressed natural gas (CNG) and liquefied natural gas (LNG) engine fuel systems on vehicles of all types and for fueling vehicle (dispensing) systems and associated storage, including the following:

(1) Original equipment manufacturers (OEMs)

(2) Final-stage vehicle integrator/manufacturer (FSVIM)

(3) Vehicle fueling (dispensing) systems

This code shall apply to the design, installation, operation, and maintenance of liquefied natural gas (LNG) engine fuel systems on vehicles of all types, to their associated fueling (dispensing) facilities, and to LNG to CNG facilities with LNG storage in ASME containers of 70,000 gal (265 m³) or less.

Vehicles and fuel supply containers complying with federal motor vehicle safety standards (FMVSSs) covering the installation of CNG fuel systems on vehicles and certified by the respective manufacturer as meeting these standards shall not be required to comply with Sections 4.4, 4.8, 4.9, and 4.10 and Chapter 6 (except Sections 6.9, 6.11, 6.12, 6.13, and 6.14).

This code shall apply to the design, installation, operation, and maintenance of compressed hydrogen (GH₂) and liquefied compressed hydrogen (LH₂).

This code shall include marine, highway, rail, off-road, and industrial vehicles.

Vehicles that are required to comply with applicable federal motor vehicle safety standards covering the installation of LNG fuel systems on vehicles and that are certified by the manufacturer as meeting these standards shall not be required to comply with Chapter 11, except 11.12.8.

This code shall apply to testing, service, and maintenance of GH₂ engine fuel systems.

Vehicles that meet FMVSS requirements for hydrogenfueled vehicles shall not be subject to this document.