1.1 这种做法允许在环境条件下测量平面接头组件上的螺栓载荷引起的垫圈压缩。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.4 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。 ====意义和用途====== 4.1 法兰接头中螺栓载荷产生的垫片压缩在接头组件的应用工程中很重要。它们与垫圈的密封能力、组件螺栓的密封性以及决定接头组件使用性能的各种其他垫圈财产有关。因此，能够确定垫圈在螺栓载荷下的压缩程度将允许人们对接头组件与应用或服务环境接触时的行为进行定性预测。通过插塞测试，可以测量面向螺栓中心之间的法兰的弯曲；然而，在少数高度变形的法兰中，可能无法检测到螺栓中心之间的最大弯曲。 4.2 平面接头组件中选定点处垫圈压缩的变化揭示了法兰变形的程度或法兰在整个垫圈中令人满意地分配螺栓载荷压缩力的能力。

1.1 This practice permits measurement of gasket compression resulting from bolt loading on a flat-face joint assembly at ambient conditions. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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. 1.4 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 Gasket compressions produced by bolt loads in a flanged joint are important in the application engineering of a joint assembly. They are related to the ability of a gasket to seal, to maintain tightness on assembly bolts, and to a variety of other gasket properties that determine the service behavior of a joint assembly. Thus, being able to determine the degree of compression in a gasket under the bolt loading will permit one to make qualitative predictions of the behavior of a joint assembly when it comes in contact with the application or service environment. With the plug test, bending of a flange facing between bolt centers can be measured; however, in a few highly distortable flanges the maximum bending between bolt centers may not be detected. 4.2 The variation in gasket compressions at selected points in a flat-face joint assembly reveals the degree of flange distortion or the ability of the flange to distribute satisfactorily the compressive forces from bolt loads throughout the gasket.