GB/T 43658.1-2024 Non-destructive testing—Radiographic inspection of corrosion and deposits in pipes by X and gamma rays—Part 1:Tangential radiographic inspection

Scope

This document specifies the basic techniques for film and digital radiographic inspection to meet the detection requirements and obtain satisfactory, economical, and reproducible inspection results. The techniques specified in this document are based on the basic theory and experiments of detection. This document is applicable to the detection of point corrosion, surface corrosion, and erosion defects caused during the service life of steel pipes. In this document, "pipe" refers not only to its conventional meaning, but also to other cylindrical objects such as small-diameter pipes, pressure pipes, boiler drums, and pressure vessels. The detection techniques specified in this document are applicable to the detection of welding seams with corrosion/erosion-related defects, but not to the detection of typical defects caused by the welding process. This document describes the evaluation method of material loss inside or outside the pipe that may be caused by corrosion or erosion. The pipe may or may not contain insulation layers. This document specifies the tangential detection techniques for detecting and measuring wall thickness loss, including the following radiation source arrangements: a) on the centerline of the pipe; and b) deviating from the centerline in the pipe diameter direction. ISO 207692 specifies double-wall radiographic detection techniques. The double-wall double-image technique is usually used in conjunction with the tangential radiation technique with the source on the centerline of the pipe. This document is applicable to tangential radiation detection techniques using industrial film radiography, computed radiography (CR), and digital array detectors (DDA).

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