1.1 本规程描述了在对用于石油和天然气勘探和生产的管柱上的钻柱螺纹进行交流现场测量检查时应遵循的程序，以进行检测，并在需要时确定横向于管道的服务引起的表面断裂不连续性的尺寸。 1.2 本规程适用于任何金属材料的螺纹。 1.3 本规程未规定验收标准。典型的行业惯例是在检测到确认的裂纹时拒绝这些连接。 1.4 虽然交流磁场测量技术能够检测这些连接中的不连续性，但补充的表面无损检测方法，如黑色金属的磁粉检测和非金属的渗透检测- 黑色金属可能检测到额外的不连续性。 1.5 单位- 以英寸磅单位或国际单位制表示的数值应单独视为标准值。每个系统中所述的值可能不完全相等；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。 1.6 本标准并不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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 交流磁场测量方法的目的是评估螺纹表面断裂不连续性，如沿螺纹根部延伸的疲劳裂纹。然后，检查结果可用于确定试件的命运。这可能涉及使用替代技术重新检查、立即报废试件或返工以消除不连续性（超出本规程范围）。本规程不适用于检查螺纹的非表面断裂不连续性。

1.1 This practice describes procedures to be followed during alternating current field measurement examination of drillstring threads on tubulars used for oil and gas exploration and production for detection and, if required, sizing of service-induced surface breaking discontinuities transverse to the pipe. 1.2 This practice is intended for use on threads in any metallic material. 1.3 This practice does not establish acceptance criteria. Typical industry practice is to reject these connections on detection of a confirmed crack. 1.4 While the alternating current field measurement technique is capable of detecting discontinuities in these connections, supplemental surface NDT methods such as magnetic particle testing for ferrous metals and penetrant testing for non-ferrous metals may detect additional discontinuities. 1.5 Units— The values stated in either inch-pound units or SI units are to be regarded separately as standard. The values stated in each system might not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from both systems may result in nonconformance with the standard. 1.6 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. 1.7 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 ====== 5.1 The purpose of the alternating current field measurement method is to evaluate threads for surface breaking discontinuities such as fatigue cracks running along the thread root. The examination results may then be used to determine the fate of the test piece. This may involve re-examination by an alternative technique, immediate scrapping of the test piece, or reworking to remove discontinuities (beyond the scope of this practice). This practice is not intended for the examination of threads for non-surface breaking discontinuities.