An Experimental Study on the Pre-Strain Effect of API 5L X65 Pipeline for Natural Gas Transmission

Abstract:

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Pipelines for natural gas transmission may be subjected to plastic deformation by the outside force such as ground subsidence, ground liquefaction, cold bending and mechanical damage. Plastic deformation affects the tensile properties and fracture toughness. Tensile test, Crack tip opening displacement test and Charpy impact test were conducted on an API 5L X65 pipe to investigate the mechanical properties of pipeline subjected to plastic deformation. Axial tensile pre-strain up to approximately 10% was applied to plate-type tensile specimens cut from the API 5L X65 pipe prior to mechanical testing. Tensile test revealed that the yield strength and the tensile strength increased with increasing tensile pre-strain. However, the CTOD and Charpy impact energy values for crack initiation decreased with increasing tensile pre-strain.

Info:

Periodical:

Key Engineering Materials (Volumes 326-328)

Edited by:

Soon-Bok Lee and Yun-Jae Kim

Pages:

1063-1066

DOI:

10.4028/www.scientific.net/KEM.326-328.1063

Citation:

J. H. Baek et al., "An Experimental Study on the Pre-Strain Effect of API 5L X65 Pipeline for Natural Gas Transmission", Key Engineering Materials, Vols. 326-328, pp. 1063-1066, 2006

Online since:

December 2006

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Price:

$35.00

[1] N. Hagiwara, M. Masuda and N. Oguchi: J. of Pressure Vessel Technology Vol. 123 (2001), p.355.

[2] A. Cosham and P. Hopkins: Proc. ICPVT-10 (2003), p.357.

[3] American Petroleum Institute, 2004, Specification for Line Pipe, API 5L.

[4] British Standards Institution, 1997, Fracture Mechanics Toughbess Tests, BS 7448.

[5] Japan Welding Engineering Society, 1997, Method of Assessment for Flaws in Fusion Welded Joints with Respect to Brittle Fracture And Fatigue Crack Growth, WES 2805.

[6] American Petroleum Institute, 1999, Welding of Pipelines and Related Facilities, App. A "Alternative Acceptance Standards for Girth Welds., API 1104.

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