1.1 本规范涵盖了外径由公制管道尺寸（DN 16至1000）和英制管道尺寸（NPS 3至54）控制的交联聚乙烯(PEX)管道，以及额定压力（参见 附录X1 ）使用MRS评级系统。本规范适用于通过各种工艺制造的PEX管，只要通过该工艺制造的PEX管满足本规范的所有要求即可。包括材料、工艺、紫外线防护、尺寸、静水持续压力、环境应力开裂、稳定剂功能、弯管静水压力、饮用氯化水中的氧化稳定性、最低工作温度、交联度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。本说明书涵盖的管道旨在用于压力管道应用，例如工业和通用管道、饮用水管道、灭火管道、用于输送流体(例如油、干或湿气体、气体收集、多相流体和非饮用水油田水)的石油和天然气生产应用，以及化学管道。它不适用于市政天然气分配或室内易燃气体应用。 1.2 本规范还包括使用聚乙烯电熔配件和PEX管制成的合格接头的要求。安装注意事项在 X3.2 . 附注1: NPS配件不应用于DN尺寸的管道，DN尺寸的配件不应用于NPS管道。 1.3 本规范的文本参考了提供解释材料的注释、脚注和附录。这些注释和脚注（不包括表和图中的注释和脚注）不应被视为规范的要求。 1.4 单位- 以SI单位或英寸-磅单位表示的值应单独视为标准值。每个系统中陈述的值不一定完全等同；因此，为确保符合标准，每个系统应独立使用，两个系统的数值不得合并使用。 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指定代码（例如，MRS为8MPa的PEX管道称为PEX 80。 1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。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》中确立的国际公认的标准化原则制定的。

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, environmental stress cracking, stabilizer functionality, bent-pipe hydrostatic pressure, oxidative stability in potable chlorinated water, minimum operating temperature, degree of crosslinking, and hydrostatic burst pressure. Requirements for pipe markings are also given. The pipe covered by this specification is intended for pressure piping applications such as, industrial and general-purpose pipelines, potable water pipelines, fire – extinguishing pipelines, oil and gas producing applications to convey fluids such as oil, dry or wet gas, gas gathering, multiphase fluids, and non-potable oilfield water, and chemical pipelines. It is not intended for municipal natural gas distribution or for indoor flammable gas applications. 1.2 This specification also includes requirements for qualifying joints made using polyethylene electrofusion fittings and PEX pipe. 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.