Requirements expressed in this practice are intended to control the quality of the radioscopic images and are not intended for controlling acceptability or quality of welds.This practice applies only to the use of equipment for radioscopic examination in which the image is finally presented on a display screen (monitor) for operator evaluation. It does not apply to fully automated systems where evaluation is automatically performed by computer.
(ii) In case of 1 Chromium ½ Molybdenum steel if thickness does not exceed 13 mm and outside diameter does not exceed 127 mm and pre-heated to 125°C. (iii) Tubes 102 mm (4 inch) bore and under.- Sample welds simulating the production welds shall be provided for mechanical testing either at a rate of 2 per cent or after each 150 welding hours with a minimum of one sample weld per welder.
(iii) In case of 2¼ Chromium 1 Molybdenum steel, post weld heat treatment is not necessary under the following conditions: (1) a maximum specified Chromium content of 3.0%. The radioscopic examination data shall be recorded and stored on videotape, magnetic disk or optical disk at the maker's plant for a sufficient period after the date of radioscopic examination as specified by the Inspecting Authority, efficient radioscopic examination record recall shall be made available at any time over the record retention period and shall be traceable to the test objects.
(5) Alternatively, 5 per cent of the welds made by each welder selected at random, with a minimum of one weld per welder, shall be subjected to non-destructive examination by radiographic or other approved method.
This standard does not purport to address all of the safety concerns, if any, associated with its use.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.