Effects of Profile Data Grid on Deformation Capacity of Line Pipes

2020 ◽  
Author(s):  
Kanako Asano ◽  
Hidetaka Watanabe ◽  
Takeshi Mori ◽  
Nobuhisa Suzuki ◽  
Takekazu Arakawa
Keyword(s):  
Finite Element ◽  
Sensitivity Study ◽  
Data Grid ◽  
Grid Size ◽  
Pipe Diameter ◽  
Deformation Capacity ◽  
Finite Element Analyses ◽  
Profile Data ◽  
Line Pipe ◽  
Bending Capacity

Abstract The effects of the profile data grid on the compression or bending capacity of line pipes are discussed in this paper. An X65 600 mm line pipe and an X80 1200 mm line pipe are used in the sensitivity study. The initial profiles of the 600 mm line pipe are used for finite element analyses with different data grid sizes from 600 mm to 25 mm squares. Those of the 1200 mm line pipe are considered by varying the data grid from 1200 mm to 50 mm squares. With decreasing grid size, the compression or bending capacity tends to decrease and become stable when the data grid becomes 1/3 of the pipe diameter. The compression capacity is as small as 90% of that without profile data. The bending capacity of the 600 mm pipe pressurized to 60% SMYS decreases to 35%, while bending capacity of the 1200 mm pipe is 46% of that without profile data at the same pressure.

Effect of Material Stress-Strain Behavior and Pipe Geometry on the Deformability of High-Grade Pipelines

2004 ◽  
Vol 126 (1) ◽  
pp. 113-119 ◽  
Author(s):  
Hiroshi Yatabe ◽  
Naoki Fukuda ◽  
Tomoki Masuda ◽  
Masao Toyoda
Keyword(s):  
Finite Element ◽  
High Grade ◽  
Finite Element Analyses ◽  
Analysis Method ◽  
Element Analysis ◽  
Line Pipe ◽  
Strain Behavior ◽  
Parametric Studies ◽  
Pipe Geometry ◽  
Strain Hardening Behavior

In this study, the deformability of high-grade pipelines subjected to an axial compressive deformation was experimentally and analytically discussed. Six cases of axial compression experiments with high-grade line pipe were carried out. The pipe specimens had various material properties and wall thickness. Finite-element analyses were also carried out and verified the reliability. Then, a finite-element analysis method for evaluating the deformability of the line pipe was established. By using this method, parametric studies were carried out. The effects of the strain-hardening behavior and pipe geometry on the deformability of the high-grade pipelines were examined.

Effects of Profile Data Grid on Deformation Capacity of Line Pipes

2021 ◽  
Author(s):  
Kanako Asano ◽  
Hidetaka Watanabe ◽  
Takeshi Mori ◽  
Nobuhisa Suzuki ◽  
Takekazu Arakawa
Keyword(s):  
Data Grid ◽  
Deformation Capacity ◽  
Profile Data

scholarly journals Analysis of cold-formed steel rectangular hollow flange beams

2021 ◽  
Vol 16 (1) ◽  
pp. 58-64
Author(s):  
Nathalie Eid ◽  
Attila László Joó
Keyword(s):  
Finite Element ◽  
Numerical Study ◽  
Experimental Tests ◽  
Finite Element Analyses ◽  
Ansys Software ◽  
Current Standard ◽  
Bending Capacity ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Flange Beams

AbstractThis paper presents the results of a theoretical-numerical study of laterally-restrained thin-walled steel rectangular hollow flange beams subjected to bending, shear and bending and shear interaction. Finite element analyses were carried out by using ANSYS software, and validated by previous experimental tests. Furthermore, the effect of intermediate stiffeners was investigated, where the improvement percentage in bending capacity was 4.4%. Additionally, all the corresponding outcomes were calculated according to EN 1993-1-3. The results showed that current standard rules tend to be somewhat conservative in both bending and bending and shear interaction cases, while they are not quite accurate in shear case.

Compression Capacity and the Seismic Integrity of Locally Deformed Line Pipes

2018 ◽  
Author(s):  
Atsushi Suganuma ◽  
Junpei Kono ◽  
Masataka Hayashiguchi
Keyword(s):  
Finite Element ◽  
Ground Motion ◽  
Strain Curve ◽  
Gas Pipeline ◽  
Earthquake Ground Motion ◽  
Finite Element Analyses ◽  
Compression Tests ◽  
Design Guideline ◽  
Line Pipe ◽  
Strain Capacity

This paper discusses the effects of local deformation, dent, and strain hardening properties on strain capacity in compression of a line pipe. Compression tests were conducted using two pipes with the nominal diameter of 400mm. These pipes had roundhouse type stress-strain curve, and correspond to L290 grade in Spec 5L of API (American Petroleum Institute) standards. One pipe was a plain pipe without dent, The other was a dented pipe. The depth of the dent was about 3% of the diameter. The test results explain that the strain capacity can be reduced by 25% due to the effect of dent. A series of finite element analyses were conducted to investigate the compression behaviors. The strain capacity in compression was defined as the longitudinal critical remote strain whose strain distribution was free from the effects of a dent. At first, that finite element analyses were verified that they could reproduce the results of compression tests. Next, the size of dent were changed on that finite element analyses model, some different case were analyzed in order to investigate the changes of the strain capacity in compression. The strain capacity, the longitudinal critical remote strain, decreased to about a half in case of 3%-depth dent, compared with a plain pipe. Seismic integrity of the pipeline with a dent is discussed in accordance with the seismic design guideline issued by Japan Gas Association. In case of the strong earthquake, “Ground Motion Level-1”, the dented gas pipeline is safe, even if the depth of the dent is 10% of the diameter. In case of the maximum earthquake, “Ground Motion Level-2”, the gas pipeline might buckle longitudinally in soft ground.

Strain Localization in the Dent of a Linepipe

2014 ◽  
Author(s):  
Jandark Oshana-Jajo ◽  
Hossein Ghaednia ◽  
Jamshid Zohreh Heydariha ◽  
Sreekanta Das
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Finite Element Analyses ◽  
Remedial Action ◽  
Line Pipe ◽  
Engineering Research ◽  
Element Simulation ◽  
Prime Objective ◽  
Full Scale Tests ◽  
Pipeline Wall

Steel pipelines used for transporting oil and gas can develop various damages such as mechanical damages, corrosion, wrinkle, and crack. One of the mechanical damages is a dent with or without other defects such as corrosion, gouge, and crack. The dent without other defect is often referred to as plain dent. Depending on the severity, a dent can lead to a failure of a field linepipe. The strain concentration in a dented pipeline wall can be used to determine the level of severity of a dent. Hence, a research program was undertaken at the Centre for Engineering Research in Pipelines (CERP) using full-scale tests and finite element analyses. The prime objective of this research was to determine comparative strain distributions in and around the dent and locations of high strains developed from the denting process. This information will help the pipeline operators to determine the severity of dents in their field linepipes. Hence, the outcome of this research will allow the pipeline operators to take an informed decision on whether or not an imminent remedial action for the dented segment of the line pipe is required. This paper presents test data and finite element simulation to discuss the locations and values of crucial strains in dents.

Effects of Profile Data Grid on Deformation Capacity of Line Pipes

2021 ◽  
Author(s):  
Kanako Asano ◽  
Hidetaka Watanabe ◽  
Takeshi Mori ◽  
Nobuhisa Suzuki ◽  
Takekazu Arakawa
Keyword(s):  
Data Grid ◽  
Deformation Capacity ◽  
Profile Data
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