S9074-AR-GIB-010/278 TABLE VII. Approved weld joint designs
Approved joint efficiences and notes 14/
Service classification
Joint identification numbers (MIL-STD-22)
P-1 P-2
P-61 P-62 P-63 P-64 P-66
Piping class P-2
9, 10, 12, 13
P-16 P-42 P-60
Steam turbines class T-1 Steam turbines class T-2
Welded joints shall be full penetration (see MIL-STD-22 for guidance)
Joint designs of the same types used for previous Navy turbines are acceptable. New joint design, not proven in service, shall be reviewed and commented on by NAVSEA prior to production application. MIL-STD-22 may be used for guidance.
1.)
The application of the listed joint designs to a specific service classification is subject to the applications and limitations of MIL-STD-777 for surface ships and MIL-STD-438 for submarines. These joints may be used when specifically approved. Pressure vessel joints: Welded joints for all pressure vessels shall be of 100 percent efficiency (see 9.3). Circumferential and longitudinal joints shall be welded from both sides or consumable inserts or badgering strips shall be used to assure complete weld penetration. Welds shall be made with multiple layers of deposited metal. Welded joints for openings in class A-1, A-2, A-F, and A-LT pressure vessels including nozzles, handholes, manholes, or other penetrations of sizes 2-1/2 inch nps and greater shall be of a design and in a location which permits radiography in accordance with MIL-STD-271.
2.)
3.)
4.)
5.)
Butt welding plates of unequal thicknesses shall be in accordance with the applicable figure of MIL-STD-22.
6.)
The joints listed are applicable to welds in the pressure containing envelope of the vessel except for systems subject to submergence pressure where welds shall be full penetration. The designer is not limited to these joints or 100 percent efficiency requirement for internal or external structural attachments except where required by component or system specification.
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