1.1 本规范规定了当用作内燃机燃料时，主要由甲烷组成的气体燃料的最低燃料质量要求。 1.2 本规范定义了压缩天然气（CNG）、液化天然气（LNG）或沼气用作机动车内燃机燃料的标准。 1.3 本规范涵盖了设计用于机动车的内燃机的需求。 1.4 富含氢的燃料不在本规范的范围内。 1.5 本规范适用于以压缩气体或低温液化气体的形式交付至机动车车载燃油箱的燃油。 1.6 本规范可作为固定应用中使用的内燃机气体燃料质量要求的指南。 1.7 本规范不是天然气管道标准；这些要求由国家和地区关税决定。 1.8 单位- 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.9 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.10 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

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), 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 Fuels that have been enriched with hydrogen are outside the scope of this specification. 1.5 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 liquified gas. 1.6 This specification may serve as a guide to gaseous fuel quality requirements for internal combustion engines used in stationary applications. 1.7 This specification is not a natural gas pipeline standard; those requirements are determined by national and regional tariffs. 1.8 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. 1.9 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. 1.10 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.