T9074-AS-GIB-010/271 Rev 1
3.5.5.3.6 Tapered and Fillet Welds. Tapered and fillet-type welds shall have a minimum of two penetrameters representing the minimum and maximum weld thickness (see figures 3-14 and 3-15). However, one penetrameter may be used for small differences in thickness, provided the penetrameter size is based on the thinner section and it is placed on the thicker weld section and the film density of the penetrameter image is not greater than 15 percent more than the lightest film density in the area of interest. 3.5.5.4 Radiography of Parts. Penetrameters are not required on each film when placement of the penetrameter on the part would obscure part or all of the area of interest, and where it would not be practicable to place the penetrameter on a block adjacent to the part, as specified in 3.5.5.1.3. However, an initial technique shot with the applicable penetrameter on the part shall demonstrate the specified sensitivity, and subsequent exposure without a penetrameter shall be made only if exposed in the same manner as the technique shot. Whenever the setup is changed, and at intervals not greater than once each work shift, additional technique shots shall be made in proper sequence to assure that the process is being properly controlled. The technique shots shall accompany the subsequently exposed film. If multiple parts or components are exposed simultaneously, at least one penetrameter shall be required on each film plus additional penetrameters as required by table 3-4. 3.6 SHIMS. When it is necessary to compensate for a difference in material thickness between the area of interest and the area where the penetrameter is located, a shim of material which is of the same or a lower group number shall be placed under the penetrameter to ensure that the density requirements of 3.5 are met. The shim image shall extend beyond the penetrameter image on at least one side; for pipe less than 1-inch nominal pipe size the end of the penetrameter and shim nearest the weld needs to be discernible on the radiograph. All other penetrameter features required by the applicable quality level shall be visible. The image of the shim shall not overlap the image of the weld or backing strip or ring.
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