标准编号：ISO 20769-2:2018
中文名称：无损检验 X射线和伽马射线对管道中腐蚀和沉积物的射线检查 第2部分：双壁射线检查
英文名称：Non-destructive testing — Radiographic inspection of corrosion and deposits in pipes by X- and gamma rays — Part 2: Double wall radiographic inspection
发布日期：2018-09
标准范围
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 pipes in metallic materials 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 double wall inspection techniques for detection of wall loss, including double
wall single image (DWSI) and double wall double image (DWDI).
Note that the DWDI technique described in this document is often combined with the tangential
technique covered in ISO 20769-1.
This document applies to in-service double wall radiographic inspection using industrial radiographic
film techniques, computed digital radiography (CR) and digital detector arrays (DDA).
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