1.1 本规程描述了在现场环境中（但不限于）通过热熔连接的方式，使用聚酰胺12（PA12）管道和配件制作对接熔合接头的程序。程序A适用于40℃的环境温度 °F（4 °C）及以上。程序B适用于低于40℃的现场温度 °F（4 °C）。其他合适的热熔连接程序可从各种来源获得，包括管道和管件制造商。本标准并不旨在解决所有可能的热熔连接程序，也不排除使用由其他方开发的经证明可产生可靠热熔接头的合格程序。 1.2 参数和程序仅适用于连接PA12管道和管件，不适用于其他聚酰胺类型。根据规范，它们仅适用于PA12燃气管道 F2785 PA12对接热熔管件符合规范 F1733 . 本规程不允许与其他聚酰胺类型融合（即交叉融合），且本规程不适用于其他聚酰胺类型。咨询管道和配件制造商，确保他们建议将此程序用于待连接的管道和配件（另请参阅 附录X1 ). 1.3 本规程中的程序适用于PA12管道和对接熔合配件的对接熔合，符合 1.2 具有相同的直径和壁厚。 注1: 提到 X1.5 有关不同壁厚的指导。 1.4 其他合适的热连接程序可从各种来源获得，包括管道和管件制造商。PA12化合物的熔体特性、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，应考虑制造商的建议。 1.5 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。 1.6 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。 1.6.1 如果两个系统的值相结合，则可能不符合本规范。括号中的值是经过适当四舍五入以确保准确性和精度的转换；并非完全等同，且用于非强制性信息目的。 1.7 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。 1.8 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 practice describes procedures for making butt fusion joints with Polyamide 12 (PA12) pipe and fittings by means of heat fusion joining in, but not limited to, a field environment. Procedure A is for environmental temperatures of 40 °F (4 °C) and higher. Procedure B is for site temperatures below 40 °F (4 °C). Other suitable heat fusion joining procedures are available from various sources including pipe and fitting manufacturers. This standard does not purport to address all possible heat fusion joining procedures, or to preclude the use of qualified procedures developed by other parties that have been proved to produce reliable heat fusion joints. 1.2 The parameters and procedures are applicable only to joining PA12 pipe and fittings and are not applicable to other polyamide types. They are intended only for PA12 fuel gas pipe per Specification F2785 and PA12 butt heat fusion fittings in accordance with Specification F1733 . Fusion to other polyamide types (that is, cross-fusion) is not permitted under this practice, and this practice does not not apply to other polyamide types. Consult with the pipe and fittings manufacturers to make sure they recommend this procedure for the pipe and fittings to be joined (also see Appendix X1 ). 1.3 The procedures in this practice apply to the butt fusion of PA12 pipe and butt fusion fittings in accordance with 1.2 having like diameter and wall thickness. Note 1: Refer to X1.5 for guidance regarding dissimilar wall thicknesses. 1.4 Other suitable heat joining procedures are available from various sources including pipe and fitting manufacturers. Melt characteristics, average molecular weight and molecular weight distribution of PA12 compounds are influential factors in establishing suitable fusion parameters; therefore, consider the manufacturer’s recommendations in the use or development of a specific fusion procedure. 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 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. 1.6.1 Non-conformance with this specification is possible if values from the two systems are combined. Values in parentheses are conversions that are appropriately rounded for accuracy and precision; that are not exact equivalents, and that are for non-mandatory informational purposes. 1.7 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. 1.8 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.