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ISO 17636-1-2013 pdf free download
ISO 17636-1-2013 pdf free download.Non-destructive testing of welds Radiographic testing Part 1:X- and gamma-ray techniques with film
ContrOle non destructif des assemblages soudOs — Con trOle par radiographie — Partie 1: Techniques par rayons X ou gamma a l’aide de film.
Its location shall be made in a section of uniform thickness characterized by a uniform optical density on the film.
According to the 101 type used, cases a) and b) shall be considered.
a) When using a wire 101, the wires shall be directed perpendicular to the weld and its location shall ensure that at least 10 mm of the wire length shows in a section of uniform optical density, which is normally in the parent metal adjacent to the weld. For exposures in accordance with 7.1.6 and 7.1.7. the 101 can be placed with the wires across the pipe axis and they should not be projected into the image of the weld.
b) When using a step hole IQI. it shall be placed in such way that the hole number required is placed close to the weld.
For exposures in accordance with 7.1.6 and 7.1.7, the 101 type used can be placed either on the source oron the film side. If the IQIs cannot be placed in accordance with the above conditions, the IQIs are placed on the film side and the image quality shall be determined at least once from comparison exposure with one 101 placed at the source side and one at the film side under the same conditions.
For double wall exposures. when the 101 is placed on the film side, the above test is not necessary. In this case, refer to the correspondence tables (Tables B.3 to B.12).
Where the lOIs are placed on the film side, the letter F shall be placed near the 101 and it shall be stated in the test report.
If steps have been taken to guarantee that radiographs of similar test objects and regions are produced with identical exposure and processing techniques, and no differences in the image quality value are likely, the image quality need not be verified for every radiograph. The extent of image quality verification should be subject to agreement between the contracting parties.
For exposures of pipes with diameter 200 mm and above with the source centrally located at least three lOIs should be placed equally spaced at the circumference. The film(s) showing 101 images are then considered representative for the whole circumference.
6.8 Evaluation of image quality
The films shall be viewed in accordance with ISO 5580.
From the examination of the image of the 101 on the radiograph, the number of the smallest wire or hole which can be discerned is determined. The image of a wire is accepted if a continuous length of at least 10 mm is clearly visible in a section of uniform optical density. In the case of the step hole type 101. if there are two holes of the same diameter, both shall be discernible, in order that the step be considered as visible.
The IQI value obtained shall be indicated on the test report of the radiographic examination. In each case the type of indicator used shall be clearly stated, as shown on the 101.ISO 17636-1-2013 pdf free download.
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