1.1 这种做法 2. 介绍了在使用超声波方法进行体积检查期间检测金属管道中不连续性的程序。本规程适用的超声波方法的具体技术包括接触和非接触的脉冲反射技术（例如，如指南中所述） E1774 和实践 E1816 )和角波束浸入技术，包括传统阵列和相控阵。人工反射器由纵向反射器组成，当使用方或多方指定时，放置在参考标准表面上的横向参考凹口被用作标准化超声系统的主要手段。 1.2 本规程适用于外径约为 1. / 2. 在里面（12.7 mm）及以上，前提是检查参数符合并满足第节的要求 11 . 这些程序在较小尺寸的情况下取得了成功。这些可在使用方之间的合同协议中规定。这些程序旨在确保使用适当的波束角度和波束形状，以提供管道和管子的完整体积覆盖，包括外径与壁厚之比较低的管道和管子，并在检查小尺寸时避免虚假信号响应- 直径，薄壁管。 1.3 中的程序 附件A1 适用于核及其他特殊和安全应用中使用的管道。中的程序 附件A2 可用于确定螺旋扫描螺距。 1.4 本惯例未建立验收标准；必须由使用方指定。 1.5 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。 1.6 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。 1.7 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《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====== 5.1 本规程旨在概述检测和定位重要不连续性的程序，如凹坑、空洞、夹杂物、裂纹、裂口等。 采用超声脉冲反射法。

1.1 This practice 2 covers a procedure for detecting discontinuities in metal pipe and tubing during a volumetric examination using ultrasonic methods. Specific techniques of the ultrasonic method to which this practice applies include pulse-reflection techniques, both contact and non-contact (for example, as described in Guide E1774 and Practice E1816 ), and angle beam immersion techniques, both conventional and phased array. Artificial reflectors consisting of longitudinal, and, when specified by the using party or parties, transverse reference notches placed on the surfaces of a reference standard are employed as the primary means of standardizing the ultrasonic system. 1.2 This practice is intended for use with tubular products having outside diameters approximately 1 / 2 in. (12.7 mm) and larger, provided that the examination parameters comply with and satisfy the requirements of Section 11 . These procedures have been successful with smaller sizes. These may be specified upon contractual agreement between the using parties. These procedures are intended to ensure that proper beam angles and beam shapes are used to provide full volume coverage of pipes and tubes, including those with low ratios of outside diameter-to-wall thickness, and to avoid spurious signal responses when examining small-diameter, thin-wall tubes. 1.3 The procedure in Annex A1 is applicable to pipe and tubing used in nuclear and other special and safety applications. The procedure in Annex A2 may be used to determine the helical scan pitch. 1.4 This practice does not establish acceptance criteria; they must be specified by the using party or parties. 1.5 Units— 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. 1.6 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 this practice is to outline a procedure for detecting and locating significant discontinuities such as pits, voids, inclusions, cracks, splits, etc., by the ultrasonic pulse-reflection method.