Quality Evaluation of Line Pipes by the Chevron Notched Drop Weight rear rest.

The WG in High Strength Line Pipe Research Subcommittee of Steel Pipes and Tubes Committee of the Joint Research Society of ISIJ investigated the applicability of the Chevron Notched Drop Weight Tear Test to Japanese high toughness line pipes, and developed a new test method, The Slit Chevron Notched Drop Weight Tear Test. The effects of the slit width and the notch angle of the specimen was investigated in details, and the established method was verified by the burst tests on actual pipes. The fracture appearance transition temperature of the established test is a little safe side estimation to the brittle fracture of line pipes, and the impact energy of the test gives the prediction to the ductile crack propagation and arrest in natural gas transmission pipelines. It is expected that the developed method serves for the quality evaluation of high toughness line pipes against brittle fracture and ductile crack propagation and arrest.