序言这是CSA B109的第一版。2、液化天然气汽车安装规范。它取代了2017年和2014年发布的之前版本，作为CSA B109《车辆用天然气安装规范》的第2部分。CSA B109。1适用于压缩天然气（CNG）。CSA B109。2适用于液化天然气（LNG）。本版本的变化包括:a）修订以澄清措辞和参考、表格和图表；b） 解决了与其他文件的冲突；c） 提供了本规范与CSA B109之间的一致性和澄清。1.d） 校正的度量值； e）与其他行业规范和标准的统一定义。CSA集团承认，该准则的制定部分是由于加拿大自然资源部的财政支持。本规范的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。范围1。1应用本规范适用于动力工业卡车应用和液化天然气（LNG）车辆中安装的燃料储存和输送系统的安装、检查、维修和维护。 这包括自行式车辆上用于提供动力的燃油系统。联邦或省级监管要求可能会取代本规范的要求。1.2例外情况本规范不适用于a）静止发动机；b） 使用天然气作为燃料而非推进的移动设备；c） 燃料管理系统的电子部件；d） 在海上船舶或铁路车辆上储存或使用天然气，或通过油罐车运输；e） 休闲全地形车；f）摩托车。1.3测量单位——在本规范中，以国际单位制给出的数值为记录单位。 括号中给出的值仅供参考和比较。注:1）在将英制单位转换为公制单位时，可以使用IEEE/ASTM SI 10或ISO 80000-1作为指南。2） 本规范中使用“加仑”一词时，表示相当于3.785升水容量的美国加仑。1.4压力参考除非另有规定，否则本规范中所有提及的“psi”均应视为表压。1.5本规范中的强制性和信息性规定，“应”用于表示要求，即用户为遵守本规范有义务满足的规定； “应该”用于表示建议或建议但不需要的建议；“may”用于表示一个选项或在本规范范围内允许的选项。注释随附条款不包括要求或替代要求；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。附件被指定为规范性（强制性）或信息性（非强制性）以定义其应用。

PrefaceThis is the first edition of CSA B109.2, Liquefied natural gas vehicle installation code. It supersedes the previous editions published in 2017 and 2014 as Part 2 of CSA B109, Natural gas for vehicles installation code. CSA B109.1 is applicable to compressed natural gas (CNG). CSA B109.2 is applicable to liquefied natural gas (LNG). Changes in this edition include the following: a) revisions to clarify wording and references, tables, and figures; b) resolved conflicts identified with other documents; c) provided consistency and clarification between this Code and CSA B109.1; d) corrected metrication values; and e) harmonized definitions with other industry codes and standards. CSA Group acknowledges that the development of this Code was made possible, in part, by the financial support of Natural Resources Canada. This Code has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.Scope1.1 Application This Code applies to the installation, inspection, repair, and maintenance of the fuel storage and delivery system installed in powered industrial truck applications and vehicles for use with liquefied natural gas (LNG). This includes fuel systems on self-propelled vehicles for the provision of motive power. Federal or provincial regulatory requirements might supersede the requirements of this Code.1.2 Exclusions This Code does not apply to a) stationary engines; b) mobile equipment using natural gas as a fuel for other than propulsion; c) electronic components of a fuel management system; d) storage or utilization of natural gas on marine vessels or rail vehicles or transportation by tanker truck; e) recreational all-terrain vehicles; and f) motorcycles.1.3 Units of measure The values given in SI units are the units of record for the purposes of this Code. The values given in parentheses are for information and comparison only. Notes: 1) IEEE/ASTM SI 10 or ISO 80000-1 can be used as a guide when converting imperial units to metric units. 2) Where the word "gallon" is used in this Code, it indicates a U.S. gallon equivalent to 3.785 L water capacity.1.4 Pressure references All references to "psi" throughout this Code are to be considered gauge pressures, unless otherwise specified.1.5 Mandatory and informative provisions In this Code, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Code; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Code. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.