MIL-T-425 Tube, Steel: Pipeline Section; With Grooved Nipple Welded On Each EndThis specification covers thin wall steel pipe with a grooved pipe nipple welded on each end.

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MIL-T-425J

4.4.3.2  Samples.  Samples selected in accordance with 4.4.1 shall be tested as specified in

4.5.2.2.  Failure of any test shall be cause for rejection.

4.5  Inspection procedure.

4.5.1  Examination.  The pipeline section(s) shall be examined as specified herein for the following defects:

101.     Nominal size pipe not as specified (see 1.2).

102.     Material of thin-wall pipe not as specified (see 3.3.1).

103.     Nipples not as specified (see 3.3.2).

104.     Welding electrodes not as specified (see 3.3.3).

105.        Materials are not resistant to corrosion or deterioration or treated to be made resistant to corrosion or deterioration for the applicable storage and operating environment

(see 3.3.4).

106.     Dissimilar metals as defined in MIL-STD-889 are not effectively insulated from each other

(see 3.3.5).

107.        Used, rebuilt, or remanufactured components, pieces or parts incorporated in the pipeline section (see 3.3.6).

108.     Straightness of pipeline sections not as specified (see 3.4.3)

109.     Fabrication not as specified (see 3.5).

110.     Qualification of welders and welding operators not as specified (see 3.5.1).

111.     Dimensions and tolerances not as specified (see 3.6).

112.     Identification marking not as specified (see 3.7).

113.     Treatment and painting not as specified (see 3.8).

114.     Protective mill coating of oil not applied to pipe as specified (see 3.9).

115.     Workmanship not as specified (see 3.10).

4.5.2  Tests.

4.5.2.1  Hydrostatic test.  The pipeline sections shall be tested as specified in API-SPEC 5L (Specification for Line Pipe), section 5, at the applicable test pressures specified in 3.4.1.  Any evidence of leaking, sweating, or yielding shall constitute failure of this test.

4.5.2.2  Tensile test.  Tensile strength of the pipeline section(s) shall be tested as specified in

API-SPEC 5L, section 4.  Nonconformance to 3.4.2 shall constitute failure of this test.

4.6.  Inspection of packaging.

4.6.1  Quality conformance inspection of pack.

4.6.1.1  Unit of product.  For the purpose of inspection, a completed bundle of pipeline sections prepared for shipment shall be considered a unit of product.

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