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F. Technological Tests on Pipes
1. Pipe flattening test
1.1 To perform this test, a section of pipe equal in length to 1,5 times the pipe diameter, but not less than 10 mm and not more than 100 mm, is flattened between two plates to the prescribed distance H, see Chapter 2 ¨C Steel and Iron Materials, Section 2, A.8.5 or until fracture occurs, see Figure 2.8. In the case of welded pipes, the specimen shall be placed in the press in such a manner that the seam is set at 90¡ã to the direction of the pressure, unless agreed otherwise.
1.2 After the test, the specimens shall be thoroughly examined for defects with normal visual acuity.
The test shall be satisfactory if the specimen, having been flattened to the prescribed distance, is free from cracks and did not fracture.
The dimensions of the pipe section, the distance H between the flattening plates as well as the position of the welding joint are to be stated.
2. Ring expanding test
2.1 To perform this test, sections of pipe measuring 10 to 16 mm in length L are expanded to the prescribed diameter C or until fracture occurs using a drift with a taper of about 1:5. Where necessary, more than one test shall be performed with drifts of increasing diameter. The superimposition of several specimens of the same size and steel grade is permitted, see Figure 2.9.

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