1.1 本规范规定了用于吸收管道热膨胀或收缩以及终端设备和支撑结构运动引起的尺寸变化的圆形金属波纹管式伸缩接头的机械设计、制造、检验和测试的最低要求。 1.2 本规范不禁止本规范规定的最低要求之外的其他或更好的功能。 1.3 许多管道系统的布局通过方向的自然变化提供了固有的灵活性，因此任何位移都会在可接受的范围内产生主要的弯曲或扭转应变。如果系统缺乏这种固有的灵活性，设计者应考虑通过使用金属波纹管式伸缩接头来增加灵活性。 1.4 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification establishes the minimum requirements for the mechanical design, manufacture, inspection, and testing of circular metallic bellows-type expansion joints used to absorb the dimensional changes resulting from piping thermal expansion or contraction, as well as the movement of terminal equipment and supporting structures. 1.2 Additional or better features, over and above the minimum requirements set by this specification, are not prohibited by this specification. 1.3 The layout of many piping systems provides inherent flexibility through natural changes in direction so that any displacements produce primarily bending or torsional strains, within acceptable limits. Where the system lacks this inherent flexibility the designer should then consider adding flexibility through the use of metallic bellows-type expansion joints. 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 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.