DIN EN 16407-2:2014-04

This document (EN 16407-2:2014) has been prepared by Technical Committee CEN/TC 138 "Non-destructive testing", the secretariat of which is held by AFNOR (France). The responsible national body is Working Committee NA 062-08-22 AA "Industrielle Durchstrahlungsprüfung" ("Industrial radiation methods") at DIN Standards Committee Material Testing (NMP). This part of EN 16407-2 specifies fundamental techniques of radiographic inspection using films 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 standard applies to the radiographic examination of pipes in metallic materials for the detection of service induced flaws such as corrosion pitting or defects due to generalized corrosion and erosion. Besides its conventional meaning, the term "pipe" as used in this standard should be understood to cover also other cylindrical bodies such as tubes/hoses, penstocks, boiler drums and pressure vessels. Weld inspection for typical welding process induced flaws is not covered by this standard; but weld inspection is included for the detection of corrosion/erosion type flaws. The test can be carried out on pipes with or without insulation, for example in cases where loss of material due to corrosion or erosion is suspected either internally or externally of the pipe. This part of the standard deals with double wall radiographic inspection techniques intended to detect a reduction of wall thickness including double wall single image (DWSI) and double wall double image (DWDI) techniques. Note that the double wall double image technique (DWDI) described in this Part 2 is used often in combination with the tangential radiographic inspection covered by Part 1. This standard applies to the double wall radiographic inspection using industrial radiographic film techniques, computed digital radiography (CR) and digital detector arrays (DDA). For the basic techniques described in this standard, a probability of detection of defects due to corrosion, generally related to ≥ 5 % of the pipe wall thickness, should be given, provided they have a minimum extension of about 10 mm at the circumference of the pipe and in direction of the longitudinal pipe axis.