1.1 本规程将建立确定美国机械工程师学会（ASME）压力容器设计（锅炉和压力容器规范，第八节，第1和2部分）中引用的荷载常数的标准。这些常数特定于金属、半金属和非金属垫片的设计标准。 1.2 单位- 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。 1.3 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。 1.4 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。 ====意义和用途====== 4.1 垫片系数是泄漏率的函数；因此，这种做法会生成曲线。ASME锅炉及压力容器规范第八节附录2规范计算中使用的常数从这些数据中选择。具体的 m 和 y 可根据最大期望泄漏率选择值，或根据本程序中所述的这些数据得出值。本规程阐述了泄漏率和垫片厚度对垫片最初和运行时提供密封的能力的影响。 该实践在室温下进行；因此，本规程并未考虑螺栓法兰连接可能在现场应用的所有条件，如高温或热循环或两者兼有。 4.2 本规程确定了ASME设计标准特有的两个一般特征。在比较垫片材料之间的屈服和维护系数时应谨慎，建议 m 和 y 比较曲线。在应用中选择垫片材料不应仅基于这两个一般特征。给定应用的垫片材料选择应考虑本规程中未描述的其他信息，包括但不限于耐化学性、热阻、蠕变松弛、压缩性和热循环调节。 4.3 本规程以流体密封协会（FSA G 605:11）开展的工作为基础。中提供了相关的循环数据以供参考 表1- 4. . （A） BDL=低于检测极限。 （A） BDL=低于检测极限。

1.1 This practice will establish criteria for determining loading constants that are referenced in the American Society of Mechanical Engineers (ASME) pressure vessel design (Boiler and Pressure Vessel Code, Section VIII, Divs. 1 and 2). These constants are specific to this design criterion for metallic, semi-metallic, and nonmetallic gaskets. 1.2 Units— The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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 The gasket factors are a function of leak rate; therefore, this practice generates curves. Constants for use in the ASME Boiler and Pressure Vessel Code, Section VIII, Appendix 2 code calculations are selected from these data. Specific m and y values can be selected based on a maximum desired leak rate or derived from these data as described in this procedure. This practice addresses the influence of leak rate and gasket thickness on a gasket’s ability to provide a seal initially and in operation. This practice is performed at room temperature; therefore, this practice does not account for all conditions, such as high temperature or thermal cycling or both, that bolted flange connections may be subject to in field application. 4.2 This practice determines two general characteristics that are specific to the ASME design criteria. Caution should be exercised when comparing yield and maintenance factors between gasket materials, and it is recommended that the m and y curves be compared. Selecting a gasket material for use in an application should not be based exclusively on these two general characteristics. Gasket material selection for a given application should consider additional information not described in this practice, which includes, but is not limited to, chemical resistance, thermal resistance, creep relaxation, compressibility, and accommodation of thermal cycling. 4.3 This practice builds upon work conducted in the Fluid Sealing Association (FSA G 605:11). The associated round robin data is provided for reference in Tables 1- 4 . (A) BDL = below detection limit. (A) BDL = below detection limit.