Reference Radiographs are nondestructive testing standards universally accepted because of their high reliability in accept-reject actions.
These reference radiographs for heavy-walled steel castings are applicable to nominal section thicknesses of 4-1/2 to 12 in. ( 114 to 305 mm) and consist of two sets as follows:
RRE028002 (Volume II): 4-MV to 30 MVX Rays.
Each volume consists of three categories of graded discontinuities in increasing levels of severity, and three categories of ungraded discontinuities furnished as examples only.
Adjunct to E280 Volume II -- Reference Radiographs for Heavy-Walled (4 1/2 to 12-in. (114 to 305-mm)) Steel Castings