ASTM D8080 : 24

1.1 This specification defines the minimum fuel quality requirements for gaseous fuels consisting primarily of methane when used as an internal combustion engine fuel.

1.2 This specification defines the criteria for compressed natural gas (CNG), liquefied natural gas (LNG), renewable natural gas (RNG), or biogas when used as a fuel for internal combustion engines in motor vehicles.

1.3 This specification covers the needs of internal combustion engines designed for use in motor vehicles.

1.4 This specification covers six fuel grades defined by their calculated methane number (MNc) and the maximum allowed volume fraction of sulfur expressed in ppm(v). They are described as follows:

1.5 Fuels that have been enriched with hydrogen are outside the scope of this specification.

1.6 This specification applies to the fuel as delivered into the on-board fuel tanks of a motor vehicle either as a compressed gas or cryogenic liquefied gas.

1.7 This specification may serve as a guide to gaseous fuel quality requirements for internal combustion engines used in stationary applications.

1.8 This specification is not a natural gas pipeline standard; those requirements are determined by national and regional tariffs.

1.9 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.11 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.