Radiography Test Film Inspection as per ASME B 31.1

Radiography Inspection-
Paragraph-136.4.5

When required by this Chapter (see Table 136.4), radiographic examination shall be performed in accordance with the requirements of Section V, Article 2, of the ASME Boiler and Pressure Vessel Code, except that the requirements of T-274 are to be used as a guide but not for the rejection of radiographs unless the geometrical unsharpness exceeds 0.07 in. (2.0 mm).

(A) Acceptance Standards. 
          Welds that are shown by radiography to have any of the following types of discontinuities are unacceptable:

(A.1) any type of crack or zone of incomplete fusion or penetration

(A.2) any other elongated indication that has a length greater than

(A.2.1) 1⁄4 in. (6.0 mm) for t up to 3⁄4 in. (19.0 mm), Inclusive

(A.2.2) 1⁄3t for t from 3⁄4 in. (19.0 mm) to 21⁄4 in. (57.0 mm), inclusive

(A.2.3) 3⁄4 in. (19.0 mm) for t over 21⁄4 in. (57.0 mm) where t is the thickness of the thinner portion of the weld

NOTE: t referred to in (A.2.1), (A.2.2), and (A.2.3) above pertains to the thickness of the weld being examined; if a weld joins two members having
            different thickness at the weld, t is the thinner of these two thicknesses

(A.3 ) any group of indications in line that have an aggregate length greater than t in a length of 12t, except where the

          distance between the successive indications exceeds 6L where L is the longest indication in the group

(A.4)  porosity in excess of that shown as acceptable in Nonmandatory Appendix A, A-250 of Section I of the ASME Boiler

          and Pressure Vessel Code

(A.5)  root concavity when there is an abrupt change in density, as indicated on the radiograph.

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