1.1 本规程描述了用交联聚乙烯（CX-PE）管和管子制作对接熔合接头的程序 2. 小于30 % 在连接时交联。本惯例应 不 适用于交联产品，即PEX管或油管，或在调试后适用于CX-PE 3. （调试将CX-PE管转换为交联管）。 注1: 为免生疑问，CX-PE与PEX是完全不同的产品，尤其是用于对接熔合和配件制造。本标准的读者不得将两者混淆。 1.2 这种做法与实际做法的主要区别 F2620 是指在对接熔合之前必须检查管道的生产日期。现场实验表明，最好在管道老化六个月之前制作热熔接头，以确保其交联度不超过30 % 在环境条件下。（参见 7.2 .) 1.3 接头通过在现场环境中（但不限于）进行对接熔合连接。其他合适的对接熔焊程序可从各种来源获得，包括管道和管件制造商。 本规程并不要求解决所有可能的对接熔合连接程序，也不阻止使用其他方开发的经证明可产生可靠对接熔合接头的合格程序。 1.4 本实施规程中规定的参数和程序适用于CX-PE管和管材的对接熔焊。咨询CX-PE管或管材制造商，确保其批准将本规程用于其产品的熔接对接。本规程适用于两个CX的对接融合- 聚乙烯管和管材，即使未明确提及管材。 1.5 当使用本实施规程中描述的连接程序时，CX-PE管或管子需要产生良好的接头。根据本规程连接的部件端部应具有相同的标称直径和壁厚。 1.6 使用本规程连接管道的能力并不意味着连接的管道适用于任何预期用途。 1.7 本规程无意解决CX-PE系统在使用前调试的任何相关问题。本标准实施规程旨在规定CX对接熔合的要求- PE管和管子，当遵循时，预期在所述管和管子中产生耐用接头。 1.8 本规程仅涵盖与对接熔焊相关的程序。鞍融合和窝融合不包括在本实践中。 1.9 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.10 本惯例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）不应视为本惯例的要求。 1.11 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。 1.12 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。 ====意义和用途====== 5.1 第节中描述的程序 8. 用于CX-PE管道和管子的对接熔焊，使用合适的设备和合适的环境控制程序。对焊-熔合连接过程建立适当的控制，以确保管道适合连接，操作员经过适当培训，使用了足够的设备和程序，并保护该过程免受极端环境的影响。通过测试对接熔合接头、操作员技能、仪器和所用程序来建立控制。 当正确实施该实践时，会产生强大的压力和密封接头。当按照本规程制作的接头进行破坏性测试时，预计在熔合连接区域外会发生故障。 5.1.1 本惯例应 不 用于连接按照规范制造的PEX管或管子 F876 或任何其他PEX管道或系统规范。本规程不适用于通过辐射或使用过氧化物交联的管道。本惯例应 不 用于连接已调试的CX-PE管道。 已调试的CX-PE管为交联管。 5.2 熔体特性、平均分子量和分子量分布是确定合适融合参数的影响因素，因此，在使用或开发特定融合程序时，应考虑制造商的说明。 5.3 本规程中的对接熔合程序适用于连接CX-PE管道和用于压力、低压和非压力应用的管道。对于某些应用，需要根据具有管辖权的机构的规定，通过测试使用该程序制作的接头来鉴定该程序。 5.4 这种对接熔合连接方法只能用于连接由兼容CX-PE化合物制成的管道，并且外径和壁厚应符合相同的规范尺寸。

1.1 This practice describes procedures for making butt fusion joints with crosslinkable polyethylene (CX-PE) pipe and tubing 2 which is less than 30 % crosslinked at the time of joining. This practice shall not be applied to crosslinked products, that is PEX pipe or tubing or to CX-PE after commissioning 3 (commissioning transitions CX-PE pipe into crosslinked pipe). Note 1: For avoidance of doubt, CX-PE is a completely different product than PEX, especially for the purposes of butt-fusion joining and the fabrication of fittings. The two must not be confused by the reader of this standard. 1.2 The main difference between this practice and Practice F2620 is that the production date of pipe must be checked prior to butt fusion. Field experiments have indicated that it is best to make heat fused joints before the pipe has aged six months to ensure it has not crosslinked more than 30 % at ambient conditions. (See 7.2 .) 1.3 Joints are made by means of butt-fusion joining in, but not limited to, a field environment. Other suitable butt-fusion joining procedures may be available from various sources including pipe and fitting manufacturers. This practice does not claim to address all possible butt-fusion joining procedures and does not prevent the use of qualified procedures developed by other parties that have been proven to produce reliable butt fusion joints. 1.4 The parameters and procedures set forth in this practice are applicable to the butt-fusion joining of CX-PE pipe and tubing. Consult with the manufacturers of CX-PE pipe or tubing to ensure that they approve of the use of this practice for butt-fusion joining of their products. This practice applies to butt fusion of both CX-PE pipe and tubing even when tubing is not explicitly referred to. 1.5 CX-PE pipe or tubing is required to produce sound joints when using the joining procedures described in this practice. Component ends joined in accordance with this practice shall be of the same nominal diameter and wall thickness. 1.6 The ability to join pipe using this practice does not imply that the pipe joined is suitable for any intended use. 1.7 This practice does not purport to address any issues related to the commissioning of a CX-PE system prior to its use. The intention of this standard practice is to set forth requirements for the butt fusion of CX-PE pipe and tubing which when followed are expected to yield durable joints in the said pipe and tubing. 1.8 Only procedures related to butt-fusion joining are covered in this practice. Saddle fusion and socket fusion are not included in this practice. 1.9 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.10 The text of this practice 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 practice. 1.11 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. 1.12 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. ====== Significance And Use ====== 5.1 The procedures described in Section 8 are intended for butt-fusion joining of CX-PE pipe and tubing, using suitable equipment and appropriate environmental control procedures. Appropriate controls are established on the butt-fusion joining process to ensure that the pipe is suitable for joining, that the operator is properly trained, that adequate apparatus and procedures are used, and that the process is protected from environmental extremes. The controls are established by testing butt-fusion joints, operator skills, the apparatus and the procedures used. When this practice is properly implemented, strong pressure and leak-tight joints are produced. When joints made in accordance with this practice are destructively tested, failures are expected to occur outside the fusion-joined area. 5.1.1 This practice shall not be used to join PEX pipe or tubing made in accordance with Specification F876 or any other PEX pipe or system specification. This practice is not intended to be used for pipe or tubing to be crosslinked by radiation or by using peroxides. This practice shall not be used to join CX-PE pipe that has been commissioned. CX-PE pipe that has been commissioned is crosslinked pipe. 5.2 Melt characteristics, average molecular weight and molecular weight distribution are influential factors in establishing suitable fusion parameters, therefore, consider the manufacturers instructions in the use or development of a specific fusion procedure. 5.3 The butt fusion procedures in this practice are suitable for joining CX-PE pipe and tubing that is used in pressure, low pressure, and non-pressure applications. For some applications, qualification of the procedure by testing joints made using the procedure in accordance with regulations from the authority having jurisdiction are required. 5.4 This butt-fusion joining practice shall only be used to join pipe or tubing made from compatible CX-PE compounds and meeting the same specification dimensions for outside diameter and wall.