Over deze norm
This part 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 standard applies to the radiographic examination of pipes in metallic materials for service induced flaws such as corrosion pitting, generalised corrosion and erosion. Besides its conventional meaning, "pipe" as used in this standard should be 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 may 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 Part of this standard 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 Part 2, is often combined with the tangential technique covered in Part 1 of this standard. This standard applies to in-service 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, the probability of detection should be high for corrosion type flaws with through wall extents of typically ≥ 5% of the pipe wall thickness, provided the circumferential and axial extents of the flaws are about 10mm or larger.
|Nederlandse titel||Niet-destructief onderzoek - Radiografisch onderzoek van corrosie en afzettingen in buizen door r?ntgen- en gammastralen - Deel 2: Radiografische onderzoek over de dubbele wand|
|Engelse titel||Non-destructive testing - Radiographic inspection of corrosion and deposits in pipes by X- and gamma rays - Part 2: Double wall radiographic inspection|