S9074-AR-GIB-010/278
1.
ASTM E 310 and E 186 reference radiographs (films) shall be applied as specified. The specified films shall be used for all production radiography sources. For the inclusion films. the discontinuities of film B2 are considered to be mre severe than those of B3. Those of B2 and B4 are considered to be approximately equal, with those of B4 being fewer in number but larger in size.
2.
12.4.2.1 RT evaluations. Production radiographs shall be evaluated for acceptance by comparing them with the applicable ASTM reference radiographs listed in tables XVII. XVIII, XIX, and XX. 12.4.2.2 Investment Castings. Imnstrent castings shall meet the number 5 acceptance level of ASTM E 192 except that filamentary type shrinkages contained therein are not pemitted. For double-wall radiography a reference radiograph with a wall thickness compatible with the thickness of both walls af the casting being radiographed shall be used: however. the number 4 acceptance level shall then be used for evaluation purposes. 12.4.3 Pressure test. Pressure test acceptance criteria shall be in accordance with the applicable material, system, or equipment specification.
12.4.4 UT. UT acceptance criteria shall be approved on a case basis.
12.5 Extent of NDT
12.5.1 VT. VT shall be conducted on 100 percent of all accessible casting surfaces areas which comprise finished part. Gates, risers, test coupons. temporary test flanges or similar extensions used as part of foundry procedure are excluded. 12.5.2 Pressure Test. Pressure tests shall be applied to all pressure containing areas. 12.5.3 Extent of radiograohy. Castings shall receive complete coverage, when required. in accordance! with tables XIII, XIV, and XV. Insofar as casting confirnations and thickness variations prevent attainment of the required film density in some locations, and for the purpose of defining coverage required, a casting is considered to contain the following areas:
75 percent minimum radiographic coverage areas. Areas include pressure containing areas. areas designed for dynamic loads in accordance with footnote 4, table XIII and areas stressed to 2/3 or more of the yield strength under high-impact shock.
(a)
50 percent minimum radiographic coverage areas. Remaining areas in the casting .
(b)
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