本文件规定了气密外壳和通风软管的测试和要求，气密外壳和通风软管是一种液化天然气燃料系统部件，用于ISO？3833. 本文件适用于按照ISO？15403-1（单燃料、双燃料或双燃料应用）。不适用于下列情形: a)燃料容器； b)固定式燃气发动机； c)容器安装硬件； d)电子燃料管理； e)加油容器。 应认识到，可以检查本文未具体涵盖的各种组件以满足本文的标准，并根据适当的功能测试进行测试。 除非另有说明，本文件中对压力的所有引用均被视为表压。本文件基于天然气作为燃料的工作压力为1.6 MPa【16 bar1】。通过以适当的系数（比率）调节压力，可以适应其他工作压力。例如，2 MPa（20 bar）工作压力系统将需要将压力乘以1.25。 ？ 11巴=0.1 MPa=105Pa；1MPa=1N/mm2。

This document specifies tests and requirements for the gas-tight housing and ventilation hose, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO？3833. This document is applicable to vehicles using natural gas in accordance with ISO？15403-1 (mono-fuel, bi-fuel, or dual-fuel applications). It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are to be considered gauge pressures unless otherwise specified. This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar¹]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. ？ ¹ 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm².