标准编号：ISO 20769-1:2018
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1部分：切向射线检查
英文名称：Non-destructive testing — Radiographic inspection of corrosion and deposits in pipes by X- and gamma rays — Part 1: Tangential 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 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).
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