1.1 本规范涵盖了交联聚乙烯（PEX）管，其外径按公制管径（DN 16至1000）和英制管径（NPS 3至54）控制，额定压力（见 附录X1 )使用MRS评级系统。本规范适用于各种工艺制成的PEX管，只要该工艺制成的PEX管满足本规范的所有要求。包括材料、工艺、紫外线防护、尺寸、静水持续压力、稳定剂功能、弯管静水压力、耐化学性、最低工作温度、交联度、挤压和静水爆破压力的要求和测试方法。还给出了管道标记的要求。本规范涵盖的管道用于天然气配送。 1.2 本规范还包括对使用聚乙烯电熔配件制作的接头进行鉴定的要求（例如规范 F3373 )和PEX管。根据本规范制造的PEX管使用的配件符合规范要求 F2829/F2829M . 安装注意事项 X3.2 . 注1: NPS管件不应用于DN尺寸的管道，DN尺寸的管件不应用于NPS管道。 1.3 本规范的文本参考了注释、脚注和附录，这些注释、脚注和附录提供了解释性材料。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本规范的要求。 1.4 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.4.1 为了与ISO 9080保持一致，MRS值仅以MPa和摄氏度为单位，用于转换为管道材料名称代码（例如，MRS为8 MPa的PEX管道称为PEX 80）。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。

1.1 This specification covers crosslinked polyethylene (PEX) pipe that is outside diameter controlled in metric pipe sizes (DN 16 to 1000) and inch pipe sizes (NPS 3 to 54), and pressure rated (see Appendix X1 ) using the MRS rating system. This Specification is intended for PEX pipe made by various processes, as long as the PEX pipe made by that process meets all the requirements of this Specification. Included are requirements and test methods for material, workmanship, UV protection, dimensions, hydrostatic sustained pressure, stabilizer functionality, bent-pipe hydrostatic pressure, chemical resistance, minimum operating temperature, degree of crosslinking, squeeze-off, and hydrostatic burst pressure. Requirements for pipe markings are also given. The pipe covered by this specification is intended for natural gas distribution. 1.2 This specification also includes requirements for qualifying joints made using polyethylene electrofusion fittings (such as Specification F3373 ) and PEX pipe. Fittings to be used with PEX pipe manufactured to this specification are in Specification F2829/F2829M . Installation considerations are in X3.2 . Note 1: NPS fittings should not be used for DN sized pipe, and DN sized fittings should not be used for NPS pipe. 1.3 The text of this specification references notes, footnotes, and appendixes, which provide explanatory material. These notes and footnotes (excluding those in tables and figures) should not be considered as requirements of the specification. 1.4 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.4.1 For consistency with ISO 9080, MRS values are only in MPa and degrees Centigrade for conversion to the pipe material designation code (for example PEX pipe with an MRS of 8 MPa is called a PEX 80. 1.5 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. 1.6 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.