序言这是CSA B137的第一版。19，天然气设施用黑色交联聚乙烯（PEX）管道系统。本标准将与CSA B137一起使用。0.本标准将纳入CSA B137系列的第七版。CSA B137。0提供了CSA B137系列部分或全部标准通用的要求和测试方法。范围1。1本标准涵盖天然气干线和服务中使用的黑色交联聚乙烯（PEX）管道和配件，包括含不超过1%芳烃的燃气的集气、输气和分配。 本标准涵盖公制公称尺寸DN 16至DN 1000或公称尺寸NPS-3至NPS-54的PEX管道，这些管道采用ASTM D2837规定的静水压设计基准（HDB）额定方法或ISO 9080和ISO 12162规定的最低要求强度（MRS）额定方法进行压力额定；b） 适用于工作温度介于？50和110？Cc）通过电熔合或机械配件连接，但不通过对接熔合。1.3本标准不包括拟通过对接熔合、承插熔合或鞍座熔合进行连接的管道。 1.4本标准涵盖的配件包括a）塑料到金属过渡配件；b） 电熔配件（如联轴器、弯头、三通和端盖）；c）机械联轴器。1.5本标准规定了a）聚乙烯化合物主要性能的要求；b） 成品PEX管的物理性能；c） 生产过程中的在线监测；d） 运输和储存；e）标记。注:本标准所涵盖产品的设计和安装限制见CSA Z662。1.6在本标准中，“应”用于表示要求，即:。 e、 ，用户必须满足的条款，以符合标准；“应该”用于表示建议或建议但不需要的建议；“可”用于表示一个选项或在标准范围内允许的选项。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 B137.19, Black crosslinked polyethylene (PEX) piping systems for gas services. This Standard is to be used with CSA B137.0. This Standard will be incorporated into the seventh edition of the CSA B137 Series. CSA B137.0 provides requirements and test methods that are common to some or all of the Standards of the CSA B137 Series.Scope1.1 This Standard covers black crosslinked polyethylene (PEX) pipe and fittings for use in gas mains and services, including gas gathering, gas transmission, and distribution of fuel gases containing not more than 1% aromatic hydrocarbons. This Standard covers PEX pipes in metric nominal sizes DN 16 to DN 1000 or nominal pipe sizes NPS-3 to NPS-54 that are a) pressure-rated using the hydrostatic design basis (HDB) rating method specified in ASTM D2837 or the minimum required strength (MRS) rating method specified in ISO 9080 and ISO 12162; b) intended for operating temperatures between?50 and 110?C; and c) joined by electrofusion or by mechanical fittings, but not by butt fusion. 1.3 This Standard does not cover pipes intended to be joined by butt fusion, socket fusion, or saddle fusion. 1.4 Fittings covered in this Standard include a) plastic-to-metal transition fittings; b) electrofusion fittings (e.g., couplings, elbows, tees, and end caps); and c) mechanical couplings. 1.5 This Standard specifies requirements for a) primary properties of the PE compound; b) physical properties of the finished PEX pipe; c) on-line monitoring during production; d) shipping and storage; and e) markings. Note: See CSA Z662 for design and installation limitations of products covered by this Standard. 1.6 In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "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 Standard. 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.