ISO 10893-7:2019 pdf free

ISO 10893-7:2019 pdf free.Non-destructive testing of steel tubes – Digital radiographic testing of the weld seam of welded steel tubes for the detection of imperfections
Unless otherwise specified by the product standard or agreed on by the manufacturer and the purchaser, a radiographic inspection shall be carried out on welded tubes after completion of all the primary manufacturing process operations (rolling, heat treating, cold and hot working, sizing and primary straightening, etc.).
The tubes under test shall be sufficiently straight and free of foreign matter as to ensure the validity of the test. The surfaces of the weld seam and adjacent parent metal shall be sufficiently free of such foreign matter and surface irregularities, which would interfere with the interpretation of the radiographs.
In cases where the weld reinforcement is removed, markers, usually in the form of lead arrows,shall be placed on each side of the weld such that its position can be identified on the radiographic image.Alternatively, an integrated automatic positioning system may be used to identify the position of the weld.
Identification symbols, usually in the form of lead letters, shall be placed on each section of the weld seam radiograph such that the projection of these symbols appears in each radiographic image to ensure unequivocal identification of the section. Alternatively, an integrated automatic positioning system may be used to identify the position of each radiographic image along the pipe weld.
Markings shall be displayed on the recorded radiographic images to provide reference points for the accurate relocation of the position of each radiograph. Alternatively, the automated measured image position may be displayed on the digital image viewing screen by software for accurate position relocation.
The diagnostic length shall be such that the increase in penetrated thickness at the ends of the useful length of the sensitive detector input screen shall not exceed the penetrated thickness at the centre of the detector by more than 10 % for image quality class B or by more than 20 % for image quality class A, provided the specific requirements of 6.9 and Clause 7 are satisfied. ISO 10893-7 pdf free download.