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Keywords: flaw
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Proceedings Papers

Paper presented at the The 32nd International Ocean and Polar Engineering Conference, June 5–10, 2022
Paper Number: ISOPE-I-22-154
... pipeline procedure extension crack growth calculation fe model pipeline girth weld cycle 2 flaw th cycle 0 cycle fatigue cycle 0 crack extension cdf Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference Shanghai, China, June 5 10, 2022 Copyright © 2022...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-2128
... but subjects the pipe to cyclic plastic straining. In this context, weld metal undermatch may be problematic as engineering critical assessment (ECA), undertaken to derive weld flaw acceptance criteria, typically requires that the weld metal overmatches the parent material when applied loads are in excess...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-224
... ABSTRACT The purpose of this study is to develop a simulation method to predict tensile strain limit for leakage from flaws in girth welds of high-pressure pipe. The material properties of each area in welds are measured by experiments using small size specimen. Ductile crack growth simulation...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-115
... and/or corrosion of the wall, on the buckling/collapse load bearing capacity. american petroleum institute pipeline corrosion torisphere external pressure apex wall thickness load bearing capacity dome flaw materials and corrosion sc stot 0 flowline corrosion buoyancy unit mpa thickness...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-248
... ABSTRACT The purpose of this study is to clarify crack initiation, crack growth resistance and crack path from the weld flaws and to discuss the effect of weld flaws and internal pressure on the tensile strain limit for leakage of pipelines subjected to uniaxial tension. Tensile tests were...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-164
... the tensile test specimens crack on pipe body. Nonetheless the investigation shows that the strain capacity of the reinforced X70 weld joint with flaw has lower strain capacity than original ones. It implies that although laser surface reinforced X70 weld joint cracked on pipe body in tensile test...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-351
... flaws for the girth welds through procedures such as DNV OS F101: Appendix A (DNV, 2013) and DNV RP F108 (DNV, 2006) and similar. Very little information and industry guidance is available on assuring the integrity of the seam weld itself following the reel lay process and subsequent pipeline service...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-092
... capacity girth weld girth weld joint crack tip offshore pipeline kibey uniform strain tensile test tangency approach near-seam zone specimen conf defect proc hardness flaw hydraulic fracturing The Strain Capacity of the Girth Weld Joint Cracked at Near-seam Zone Hongyuan Chen1,2,3...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-603
... Diagram (FAD) is commonly used for ECA of flawed components. However for ductile material, the use of stress-based approach leads to very conservative assessment. In such case the strain based design could be more appropriated. The purpose of this paper is to introduce a method in order to establish...
Proceedings Papers

Paper presented at the The Twenty-fifth International Ocean and Polar Engineering Conference, June 21–26, 2015
Paper Number: ISOPE-I-15-276
... in this paper, was undertaken. In addition, a 3D finiteelement (FE) study was performed on MLPs with interface flaws between the liner and clad overlay weld, and recommendations for the fatigue assessment of MLPs with interface flaws were made. upstream oil & gas outer surface liner carbon steel...
Proceedings Papers

Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, June 15–20, 2014
Paper Number: ISOPE-I-14-556
... Abstract Strain capacity prediction is important for strain-based design (SBD) of welded pipelines operating in harsh environments involving discontinuous permafrost, active seismicity, and offshore ice gouging. Current strain capacity prediction models consider only a single flaw; however...
Proceedings Papers

Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, June 15–20, 2014
Paper Number: ISOPE-I-14-517
... Abstract The strain capacity of tensile deformation of pipeline is evaluated by the strain-based design using standards and numerical methods in this study. We calculate the allowable tensile strain according to the given geometries and flaws of the pipeline by strain-based design rules given...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-295
... corrosion and accounts for the potential of accelerated crack growth due to corrosive effects. parent metal damage tolerance displacement histogram ctod riser loading upstream oil & gas allowable stress design limit load design criteria flowline flaw limit state design flaw size...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-627
... ABSTRACT A methodology is developed to account for the effect of crack face pressure on the reference stress in high pressure, thick walled, flowlines and risers. A detailed finite element analysis (FEA) is conducted over a range of crack depths (a/t) for long flaws (large crack aspect ratios...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-527
... on implications of availability of such a system on risk based inspections and structural health monitoring systems. detection transducer sensor application magnetic field upstream oil & gas flaw monitoring operator fatigue crack offshore nde method disadvantage detector ultrasonic...
Proceedings Papers

Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-184
... precipitated cracks that initiate from naturally occurring internal flaws in the ice. These spalling events result in the localization of contact into high-pressure zones through which the majority of the load is transmitted. During a continuous interaction, successive failure events contribute to random...
Proceedings Papers

Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-570
... ABSTRACT Automated ultrasonic testing (AUT) data processing techniques were evaluated and computer simulation was used for improving flaw detection, sizing, and justifying the inspection procedures. Probability of detection (POD) and accuracy of flaw sizing was determined for six...
Proceedings Papers

Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-298
... small allowed embedded and surface flaws. In previous ISOPE Conference, a paper illustrating the model for suitable prediction in crack propagation regime was presented, offering indications for a proper calculation with some reduction in over- conservativism with respect to a standard fatigue life...
Proceedings Papers

Paper presented at the The Twenty-first International Offshore and Polar Engineering Conference, June 19–24, 2011
Paper Number: ISOPE-I-11-084
... ABSTRACT: In this paper the accuracy of DNV-OS-F101 Appendix A has been investigated and discussed. The crack driving force (CDF) for 4 different flaw sizes in a OD 277 × WT 15.5 mm pipe subjected to bending into the plastic regime have been investigated by 3D FE analyses. The same flaw sizes...
Proceedings Papers

Paper presented at the The Nineteenth International Offshore and Polar Engineering Conference, July 21–26, 2009
Paper Number: ISOPE-I-09-189
... pipeline steel have shown that crack growth rates in a sour environment can be 100 times higher than in air (Holtam et al., 2008). Tests have also illustrated a possible crack depth dependence whereby shallower flaws (up to 4 mm) appear to grow faster than deeper flaws subject to the same value of stress...

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