本文件规定了胶片和数字射线照相的基本技术，目的是经济地获得令人满意且可重复的结果。这些技术基于公认的实践和该学科的基本理论。 本文件适用于对钢管进行射线照相检查，检查是否存在由服务引起的缺陷，如腐蚀点蚀、广义腐蚀和侵蚀。除其常规含义外，本文件中使用的“管道”还包括其他圆柱形物体，如管道、压力管道、锅炉汽包和压力容器。 不包括典型焊接工艺诱发缺陷的焊接检查，但包括腐蚀/侵蚀型缺陷的焊接检查。 管道可以隔热也可以不隔热，如果怀疑内部或外部因腐蚀或侵蚀等原因造成材料损失，则可以对管道进行评估。 本文件涵盖了用于检测墙体损失并确定墙体尺寸的切向检验技术，包括来源: a） 在管道中心线上；和 b） 从管道中心线偏移管道半径。 ISO 20769-2涵盖了双壁射线照相，并注意到双壁双成像技术通常与源位于管道中心线上的切向射线照相相结合。 本文件适用于使用工业射线照相胶片技术、计算机射线照相（CR）和数字探测器阵列（DDA）的切向射线照相检查。

This document specifies fundamental techniques of film and digital radiography with the object of enabling satisfactory and repeatable results to be obtained economically. The techniques are based on generally recognized practice and fundamental theory of the subject. This document applies to the radiographic examination of steel pipes for service induced flaws such as corrosion pitting, generalized corrosion and erosion. Besides its conventional meaning, "pipe" as used in this document is understood to cover other cylindrical bodies such as tubes, penstocks, boiler drums and pressure vessels. Weld inspection for typical welding process induced flaws is not covered, but weld inspection is included for corrosion/erosion type flaws. The pipes can be insulated or not, and can be assessed where loss of material due, for example, to corrosion or erosion is suspected either internally or externally. This document covers the tangential inspection technique for detection and through-wall sizing of wall loss, including with the source: a) on the pipe centre line; and b) offset from pipe centre line by the pipe radius. ISO 20769-2 covers double wall radiography, and note that the double wall double image technique is often combined with tangential radiography with the source on the pipe centre line. This document applies to tangential radiographic inspection using industrial radiographic film techniques, computed radiography (CR) and digital detector arrays (DDA).