本文件规定了适用于液化天然气（LNG）车载燃料系统的最低安全要求，该系统拟用于ISO 3833中定义的机动车类型。 本文件适用于根据ISO 15403系列使用液化天然气的车辆（单燃料、双燃料或双燃料应用）。不适用于原厂生产和改装车辆。 本文件不包括与安装人员和转换器技能有关的所有事项。 本文件仅适用于“LNG系统”中的部件，即安装在推进系统中使用LNG的机动车上的部件（油箱、阀门、柔性燃油管路等，见附录B）和连接部件（燃油管路、配件等）的总成，以及汽化器之前的相关部件。蒸发器下游的其他部件被视为ISO 15501中涵盖的CNG部件。

This document specifies the minimum safety requirements applicable to liquefied natural gas (LNG) on-board fuel system intended for use on the types of motor vehicles defined in ISO 3833. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using liquefied natural gas in accordance with the ISO 15403 series. It is not applicable to original-production and converted vehicles. All matters relating to the skills of installers and converters have been excluded from this document. This document is only applicable on the components in the "LNG system" meaning an assembly of components (tanks, valves, flexible fuel lines, etc., see Annex B) and connecting parts (fuel lines, fittings, etc.) fitted on motor vehicles using LNG in their propulsion system and related components up to and including the vaporizer. Other parts downstream from the vaporizer are considered as CNG components covered by ISO 15501.