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|  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
900
4
900
6
900
8
750
12
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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