29  June  2017

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 Infopetro -> Technology Brealcthrough
Fracture Control Technology For X80 Large OD 1422 mm Line Pipes
2017-03-01
High-grade (API 5L X80) and large-diameter (OD 1422mm) line pipes are used in the Sino-Russian eastern route gas pipeline project for high pressure (12 MPa) transmission, and this can significantly increase the transmission capacity and meet Chinas energy strategic demand. With the increase of steel grade, transmission pressure, pipe diameter and design coefficient, however, ductile fracture of line pipes becomes the dominant fracture mode, so it is necessary to focus on fracture arrest and control study. Therefore, an intensive study was performed on the Battlelle Two-Curve (BTC) method which is the major solution to the calculation of arrest toughness, as well as the fracture resistance curve and decompression curve. Based on the study, the principle and application range of the BTC method was confirmed. In addition, a series of analysis were conducted on the issues which occurred when the BTC calculation results were also provided. After the fracture control scheme of the X80 large OD 1422mm line pipes for the Russian Bovanenkovo-Ukhta was reviewed, the Charpy vee-noted (CVN) impact energy which meets the project requirement was finally worked out to be 245 J.

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