... waves (and potential fatigue damage), which sometimes goes unrecognized. To predict the damage accumulation at planar circumferential flaws (e.g., girth weld defects) from repeated hammering, flaw growth analyses were performed via Paris Law fracture mechanics formulations. An initial flaw based on NDE...

... engineering assessment arc burn girth weld finite element modeling FEA stress analysis fatigue analysis Abstract Abstract Arc burns, also known as arc strikes, are caused by momentary interaction of an electric arc, e.g., welding electrode or welding ground clamp, and a pipe...

...MATERIAL PROPERTIES AND FLAW CHARACTERISTICS OF VINTAGE GIRTH WELDS Dan Jia1 and Yong-Yi Wang1 Center for Reliable Energy Systems Dublin, OH, USA Steve Rapp Enbridge Houston, TX, USA ABSTRACT Vintage pipelines, which in the context of this paper refer to pipelines built before approximately 1970...

... developed from various current and past research programs. The trends exhibited by the various forms of specimens are examined. The implications of those trends in the strain-based design of pipelines are summarized at the end of the paper. KEYWORDS Pipeline, strain-based design, girth weld, toughness...

... of the misalignment imperfection of girth weld joint is calculated by FEM to review the applicability of relevant formulas given in BS7910 for engineering critical assessment. Finally, it is concluded by FE simulation that though the stress magnification effect of shallow cracks in weld toe zone is significant...

.... KEYWORDS Pipeline, girth weld, strain-based design, tensile strain capacity, apparent toughness, tearing resistance curve INTRODUCTION Strain-based design (SBD) is a relatively new methodology developed for pipeline design at high longitudinal strain conditions. These large strain conditions can be induced...

... 07 04 2011 Tensile strain capacity (TSC) is a critical component of the strain-based design of pipelines. TSC is affected by a number of material parameters, such as the strain hardening rate, weld strength mismatch, and toughness. Girth weld high-low misalignment, internal pressure...

... 07 04 2011 Girth Welding of high strength steels such as X80 or X100 poses a number of challenges because of the sensitivity of weld mechanical properties to variations in welding parameters and material properties. This dependency is further complicated by the application...

... 1 Copyright © 2010 by ASME A STUDY ON THE RESIDUAL STRESS AND FRACTURE BEHAVIOR OF PIPELINE GIRTH WELDS JOINING PIPES OF DIFFERENT STRENGTH) Woo-sik Kim*, Jong-hyun Baek, Choel-man Kim and Young-pyo Kim R & D Center, KOGAS, 638-1 il-dong Ansan kyunggi-do KOREA, 425-790 Tel: 82-31-400-7470, Email...

.... The capacity of compressive axial strain of the pipe is affected by a large number of factors: D/t ratio, Y/T ratio, internal pressure and girth weld effect. Consequently, full solutions for compressive strain limits related to above-mentioned factors do not yet exist in codes and standards. In recent years...

... Pipeline Strain-Based Design Tensile Strain Limit Girth Weld Proceedings of IPC2008 7th International Pipeline Conference September 29-October 3, 2008, Calgary, Alberta, Canada L n China University of Petroleum-Beijing1 Copyright © 2008 by ASME Fuxue Road 18, Changping, 102249 Beijing...

... 10 07 2009 Stress analysis is a prerequisite of Engineering Critical Analysis (ECA) of pipeline girth welds in new constructions. Such analysis is required in pipe construction standards, such as API Standard 1104 Appendix A. However no specific procedures of stress analysis...

... 10 07 2009 Pulsed gas metal arc welding (P-GMAW) is one of the most effective joining methods used for mainline field girth welding of large diameter, long distance pipelines. Single torch and single wire P-GMAW utilizing narrow-groove weld geometry has been applied extensively in both...

... that strength mismatch of girth weld had great effect on the integrity of the pipeline. Overmatch is preferred for low-grade pipeline (steel grade is usually X60 or lower). As to the high-grade pipeline, in order to reduce the sensitivity of cold crack, hydrogen induced crack (HIC) and stress induced corrosion...

... 10 12 2008 Girth welds in pipelines subject to longitudinal plastic tensile strains are critical regions of the pipeline. As girth welds might contain flaws of some form or other, it is of paramount interest to have a thorough understanding of the deformation characteristics of girth...

... 10 12 2008 Buried defects, such as lack-of-sidewall fusion defects, are some of the most commonly occurring defects in mechanized girth welds. Although some of the existing ECA (Engineering Critical Assessment) procedures permit the assessment of the significance of buried defects...

..., such as that induced by frost heave, landslide, and seismic activities. The “capacity” is most often controlled by girth weld tensile strain limits, as girth welds tend to be the weakest link in pipelines experiencing high tensile strains. The tensile strain limits of girth welds are affected by a large number...

... 07 10 2008 Alternative girth weld defect acceptance criteria implemented in major international codes and standards vary significantly. The requirements for welding procedure qualification and the allowable defect size are often very different among the codes and standards...