1.1 本规程列出了碳钢、铬钼钢管和铜镍合金管常用的支管连接类型。中给出了运行规模应用程序的分支 表1 , 表2 和 表3 .其他类型的分支连接( 图1 )可以使用，前提是它们符合《美国法典》第46篇CFR第56.07-10（f）和56.70-15（g）子部分的要求。 图1 支管连接图例 1.2 以英寸-磅单位表示的数值视为标准值。 本标准不包括其他计量单位。 1.3 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 lists commonly used types of branch connections for carbon steel, chromium-molybdenum steel pipe and copper-nickel alloy tubing. Branch to run size applications are given in Table 1 , Table 2 , and Table 3 . Other types of branch connections ( Fig. 1 ) may be used provided they comply with the requirements of Title 46 CFR Subparts 56.07-10(f) and 56.70-15(g) of the USCG Regulations. FIG. 1 Illustrative Legend for Branch Connections 1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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.