MIL-T-425J
of this specification. Used, rebuilt or remanufactured components, pieces and parts shall not be incorporated in the pipeline section.
3.4 Performance requirements.
3.4 Hydrostatic pressure. The pipeline section shall withstand the applicable hydrostatic test pressure specified in table I, without evidence of leakage, sweating, or yielding.
TABLE I. Hydrostatic test pressure ratings.
Nominal tube size (inches) |
Minimum test pressure (psi) |
2 4 6 8 12 |
900 900 900 750 600 |
3.4.2 Tensile requirements. The tensile requirements for the pipeline sections shall be as specified in API-SPEC 5L, section 4 for grade B steel pipe.
3.4.3 Straightness. Straightness of the pipeline sections shall conform to API-SPEC 5L.
3.5 Fabrication. The thin wall pipes shall be seamless or electric resistance welded steel pipes. The electric-resistance-welded pipe shall be heat treated after welding to a minimum temperature of 1000 °F or processed in such a manner that no untempered martensite remains. The nipples shall be fabricated to conform to the tolerances shown in figures 1 in inches. The nipples shall be inserted into the pipe ends and joined by a circumferential electric weld. The pipe and the nipples shall have the same outside diameter.
3.5.1 Welders and welding. Before assigning any welder or welding operator to manual welding work covered by this specification, the contractor shall obtain certification that the welder or welding operator has passed qualification tests as prescribed by either of the following listed codes for the type of welding operations to be performed and that such qualification is effective as defined by the particular code: AWS D1.1 - Structural Welding Code, Steel, ASME Boiler and Pressure Vessel Code, Section IX, Qualification Standard for Welding procedures, Welders and Welding Operators.
No welding shall be undertaken until after the welding procedure specifications and welders or welding operators have been qualified. The contractor is responsible for obtaining certification.
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