1.1 本规程描述了在车间或现场环境中通过热熔连接技术与聚烯烃管和管件（不包括聚乙烯管和管件）连接的一般程序。这些程序是通用程序。热熔合连接的具体说明可从产品制造商处获得。参见练习 F2620年 用于聚乙烯管和管件的热熔连接。 1.2 所涵盖的技术仅适用于连接聚烯烃管道和相关聚合物化学的配件，例如，聚丙烯与聚丙烯，或聚丁烯与聚丁烯。应考虑材料、密度和流速，以便在将同一材料连接到其自身或其他具有相关聚合物化学性质的材料时，形成均匀的熔体粘度和良好的熔结。 1. 3. 当使用本规程中所述的连接技术时，要求在当前ASTM规范中给出的尺寸公差范围内的零件在聚烯烃管和管件之间产生良好的连接。 1.4 以英寸-磅单位表示的值应视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准值。 1.5 本实践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（不包括表和图中的注释和脚注）不应视为本规范的要求。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。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，并确定监管限制的适用性。 参见中的具体安全预防措施 3.1.1 , 5.2 , 8.2.3.1 , 注释8 和 注释9 和 第1.1节 . 1.7 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 第节中描述的程序 7. , 8. 和 9 当在车间或现场环境中使用合适的设备和程序实施时，应产生与管道材料强度相等的强压力密封接头。有些材料比其他材料更适合一种技术。熔体特性、平均分子量和分子量分布是确定合适熔融参数的影响因素； 因此，在使用或开发特定融合程序时，请考虑制造商的说明。

1.1 This practice describes general procedures for making joints with polyolefin pipe and fittings (excluding polyethylene pipe and fittings) by means of heat fusion joining techniques in either a shop or field environment. These procedures are general ones. Specific instructions for heat fusion joining are obtained from product manufacturers. See Practice F2620 for heat fusion joining of polyethylene pipe and fittings. 1.2 The techniques covered are applicable only to joining polyolefin pipe and fittings of related polymer chemistry, for example, polypropylenes to polypropylenes, or polybutylenes to polybutylenes. Material, density, and flow rate shall be taken into consideration in order to develop uniform melt viscosities and formation of a good fusion bond when joining the same material to itself or to other materials of related polymer chemistry. 1.3 Parts that are within the dimensional tolerances given in present ASTM specifications are required to produce sound joints between polyolefin pipe and fittings when using the joining techniques described in this practice. 1.4 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. 1.5 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. 1.6 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. See specific safety precautions in 3.1.1 , 5.2 , 8.2.3.1 , Note 8 and Note 9 , and A1.1 . 1.7 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 ====== 4.1 The procedures described in Sections 7 , 8 , and 9 , when implemented using suitable equipment and procedures in either a shop or field environment, produce strong pressure-tight joints equal to the strength of the piping material. Some materials are more adaptable to one technique than another. Melt characteristics, average molecular weight and molecular weight distribution are influential factors in establishing suitable fusion parameters; therefore, consider the manufacturer's instructions in the use or development of a specific fusion procedure.