S9074-AR-GIB-010/278
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In event of conflict in NDT requirements between this table. the ship's specifications. the conponent specification or other documents. the more stringent NDTrequirements shall be invoked. RT of cast valve discs and balls is required only where such discs or balls form a part of the hull boundary and failure could permit direct flooding inside ship, except RT is not required for centrifugally cast balls. Castings of sizes less than 4 inches shall be RT inspected where their failure would result in the loss of propulsion power due to lack of cooling water necessitated by the closing of the hull and back-up valves in the main seawater system for the purpose of isolating defective castings. Refer to the applicable system or component specification for pressure test requirements. Pressure tests shall be conducted on uncoated castings. RT and MT/PT requirements do not apply to castings in open ended oxygen or hydrogen vents or drains that are located between the last isolation valve and the open end. RT is not required for holding bulkhead isolation valves 2-1/2 inches NPS and larger with design pressure of 300 through 3400 psi of nonpropulsion systems unless required by other requirements of this military document.
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12.3 Inspection details.
12.3.1 General Tables XIII. XIV. and XV summarize the inspection requirements for cast nonpressure and pressure containing castings based on application, service conditions. size. and in some cases, stress. 'X' indicates that the specific NDTtest is required for the application and conditions described by the applicable pertinent horizontal data. 12.3.2 Visual examination. Each casting shall be visually exmined for confomance with specified dimensions and surface conditions. Identification markings shall be checked to assure accuracy. 123.21 Inspection Qualification. Visual ematination shall be perlmd by personnel who have successfully passed the vision test in accordance with MIL-SlD-27l. 12.3.3 NDT. NDT shall be conducted in accordance with MIL-STD-271. Except as specified in 12.3.2 castings described for applications listed in tables XIII. XIV. and XV regardless of material shall be inspected by the NDT method indicated. Where MT/PT is indicated. materials which are magnetic at ambient temperatures shall be inspected by MT: materials which an non-magnetic shall be inspected by PT. 12.3.4 Radioaradtic standard shooting sketches. Shooting sketches prepared in accordance with MIL-STD-271 shall be provided to assist in interpretation of the applicable radiographics. Approval of the sketches is required.
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