GB/T 43658.2-2024 Non-destructive testing—Radiographic inspection of corrosion and deposits in pipes by X and gamma rays—Part 2:Double wall radiographic inspection

Scope

This document specifies the basic techniques for film and digital radiographic testing to meet the testing requirements and obtain satisfactory, economical, and reproducible testing results. The techniques specified in this document are based on the basic theory and experiments of testing. This document is applicable to the radiographic 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 defects, but not to the detection of typical defects caused by the welding process. This document describes the evaluation methods for internal or external material loss in pipes that may be caused by corrosion or erosion. The pipes may or may not contain insulation layers. This document specifies the double-wall detection techniques for detecting wall thickness loss, including the double-wall single-image technique (DWSI) and the double-wall dual-image technique (DWDI). Note: The DWDI described in this document is typically used in conjunction with the tangential radiography technique specified in ISO 207691. This document is applicable to in-service double-wall radiographic detection techniques using industrial film radiography, computed radiography (CR), and digital array detectors (DDA).

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