1.1 本规范涵盖交联聚乙烯(PEX)管材，该管材包含任选的聚合物内层、中间层或外层，外径受控，除另有说明外，按标称SDR9管材尺寸比制造，并在三种温度下对水的额定压力（参见 附录X1 ).包括材料、工艺、尺寸、爆破压力、静水持续压力、过高温度和压力、环境应力开裂、稳定剂功能、弯管静水压力、饮用水氯化水中的氧化稳定性、抗紫外线性和交联度的要求和测试方法。还给出了管道标记的要求。本规范涵盖的组件旨在用于但不限于住宅和商业、热-以及冷饮用水分配系统、再生水、消防、市政供水管线、建筑供应管线、辐射加热和冷却系统、循环分配系统、冰雪融化系统、地热地面回路、区域供暖、草坪调节、压缩空气分配和建筑服务管道，前提是此处涵盖的PEX管道符合适用的规范要求。 1.2 本规范的文本引用了提供解释材料的注释、脚注和附录。这些注释和脚注（不包括表格和图中的注释和脚注）不应被视为规范的要求。 1.3 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。括号中给出的值是数学转换，可能不完全等同于SI单位或英寸-磅单位，仅供参考。 1.4 以下安全危害警告仅适用于试验方法部分，章节 7 本说明书: 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。 1.5 本国际标准是根据关于制定国际标准、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由世界贸易组织技术性贸易壁垒委员会编辑。

1.1 This specification covers crosslinked polyethylene (PEX) tubing that incorporates an optional polymeric inner, middle or outer layer and that is outside diameter controlled, made in nominal SDR9 tubing dimension ratios except where noted, and pressure rated for water at three temperatures (see Appendix X1 ). Included are requirements and test methods for material, workmanship, dimensions, burst pressure, hydrostatic sustained pressure, excessive temperature and pressure, environmental stress cracking, stabilizer functionality, bent-tube hydrostatic pressure, oxidative stability in potable chlorinated water, UV resistance, and degree of crosslinking. Requirements for tubing markings are also given. The components covered by this specification are intended for use in, but not limited to, residential and commercial, hot- and cold-potable water distribution systems, reclaimed water, fire protection, municipal water service lines, building supply lines, radiant heating and cooling systems, hydronic distribution systems, snow and ice melting systems, geothermal ground loops, district heating, turf conditioning, compressed air distribution and building services pipe or tubing, provided that the PEX tubing covered herein complies with applicable code requirements. 1.2 The text of this specification references notes, footnotes, and appendixes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification. 1.3 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. The values given in parentheses are mathematical conversions that may not be exact equivalents to either SI units or inch-pound units and that are provided for information only. 1.4 The following safety hazards caveat pertains only to the test methods portion, Section 7 , of this specification: 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. 1.5 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.