1.1 本规范规定了气体燃料的最低燃料质量要求，气体燃料主要由甲烷与体积分数高达10%的氢气（H 2. )当用作内燃机燃料时。 1.2 本规范规定了将氢气与天然气、沼气或可再生天然气（RNG）混合，然后压缩成压缩天然气（CNG）用作机动车内燃机燃料的标准。 1.3 燃料中氢气的总体积分数应包括天然气、沼气或可再生气体中所含的氢气以及混合到燃料混合物中的任何额外氢气。 1.4 本规范涵盖了设计用于机动车的内燃发动机的需求。 1.5 本规范适用于作为压缩气体输送至机动车车载油箱的燃料。 1.6 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。 1.7 单位- 以国际单位制表示的数值应视为标准。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.8 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.9 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification defines the minimum fuel quality requirements for gaseous fuels consisting primarily of methane blended with volume fraction of up to 10 % hydrogen (H 2 ) when used as an internal combustion engine fuel. 1.2 This specification defines the criteria for blending hydrogen with natural gas, biogas, or renewable natural gas (RNG) and then compressed into compressed natural gas (CNG) for use as a fuel for internal combustion engines in motor vehicles. 1.3 The total volume fraction of hydrogen within the fuel shall consist of hydrogen contained in the natural gas, biogas, or renewable gas and any additional hydrogen blended into the fuel mixture. 1.4 This specification covers the needs of internal combustion engines designed for use in motor vehicles. 1.5 This specification applies to the fuel as delivered into the on-board fuel tanks of a motor vehicle as a compressed gas. 1.6 This specification is not a natural gas pipeline standard; those requirements are determined by national and regional tariffs. 1.7 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. 1.8 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. 1.9 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.