20.3.1 When specified, radiographic inspection shall be in
accordance with Guide E 94 and Reference Radiographs
E 155.
20.3.2 Radiographic acceptance shall be in accordance with
the requirements selected from Table 3. Any modifications of
the table and the frequency per unit area and location of
discontinuities should also be agreed upon.
20.3.3 The number, film size and orientation of radiographs,
and the number of castings radiographically inspected shall be
agreed upon by the producer and purchaser.