API 5L Line Pipe Test Methods

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Three Common Test Methods of API 5L Line Pipe

How to test API 5L seamless and welded pipes?Today,Hunan Tube sharing three common test methods of API 5L Line Pipe.


Hydrostatic test

a. Jointers need not be hydrostatically level, provided that the portions of pipe used in making the jointers were successfully hydrostatically tested prior to the joining operation.

b. Except the previous situation, the pipe shall withstand the hydrostatic test without leakage through the weld seam or the pipe body.


Bend test
Cracks should not occur in any part of the sample and opening of weld shall not occur as well.

Please Note: For all bend test, the weld extends to a distance of 6.4 mm (0.25 in) on each side of fusion line.


Flattening test
The flattening test method is used to verify the deformation performance of line pipe to the specified size, and display its defects. According to the stress and deformation characteristics of the specimen during the flattening process, the flattening test shall show the resistance to longitudinal cracking and circumferential cracking of the pipe, and display its internal defects and surface defects.


Other than above three common tests there are other tests that required in each circumstances.
Guided-bend test
CVN impact test for PSL2 pipe (including pipe body tests, pipe weld and HAZ tests)

DWT test for PSL2 welded pipe