Strain Analysis of Oil and Gas Pipeline with Dents Based on ILI Data

2016 ◽  
Vol 853 ◽  
pp. 372-376
Author(s):  
Zheng Qiang Lei ◽  
Jian Chen ◽  
Fu Xiang Wang ◽  
Ting Wang ◽  
Li Jian Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Oil And Gas ◽  
Strain Analysis ◽  
Gas Pipeline ◽  
Safe Operation ◽  
Buried Pipe ◽  
Strain Calculation ◽  
Acceptable Range ◽  
Integrity Analysis

Dents in an oil and gas pipeline can be detected by In-line-Inspection (ILI), and structure integrity analysis of the pipe with theses reported dents is important for the safe operation. Strain analysis of the dented pipe is a way of fine assessment and ASME B31.8 has established the strain assessment code and its acceptable range. However, the method of strain assessment is rarely used due to the difficulty of strain calculation for a buried pipe. In this study, features of ILI data are investigated to elaborate the necessary of filtering analysis for strain analysis of the dent with ILI data. Then typical filtering methods are used to smooth the ILI data, and strain analysis are carried out with the smoothed data to study the practicability of strain assessment. Profile and strain of a dent in D813 pipe were obtained by Finite Element Method (FEM). Then different filtering methods were used to smooth the simulated ILI data of the dent which were selected from FEM profile. Strain of the dent were also calculated by smoothed data with the latest ASME B31.8 code, and compared with it from FEM at last to prove the feasibility and validity of the filtering methods with ASME B31.8 code.

Research of Sealing Property to Subsea Oil and Gas Pipeline Repair Clamp

2015 ◽  
Author(s):  
Bingjie Zhao ◽  
Hongwu Zhu ◽  
Shuli Zhang ◽  
Jinya Zhang ◽  
Deyu Tang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Oil And Gas ◽  
Gas Pipeline ◽  
The Finite Element Method ◽  
Key Technology ◽  
Repair Technology ◽  
Sealing Material ◽  
The Common ◽  
Reliable Basis

The clamp repair technology of subsea oil and gas pipeline has been successfully used in China’s subsea oil and gas pipeline repair projects. However, the key equipment research of flange compression sealing subsea pipeline repair clamp in the technology has just started. The sealing technology is the key technology of subsea oil and gas pipeline repair clamp. The common form of seal in subsea oil and gas pipeline repair clamp is introduced in the paper. The sealing structure of subsea oil and gas pipeline repair clamp is designed and the sealing material is selected for subsea oil and gas pipeline repair clamp. It utilizes the finite element method to calculate sealing property of the rubber sealing which shows the sealing structure can completely meet the sealing request under the pressure of 10 MPa, what can provide a reliable basis for sealing design of subsea oil and gas pipeline repair clamp.

scholarly journals Stress and strain analysis from dynamic loads of mechanical hand using finite element method

2018 ◽  
Vol 352 ◽  
pp. 012017 ◽  
Author(s):  
Iskandar Hasanuddin ◽  
Husaini ◽  
M. Syahril Anwar ◽  
B.Z. Sandy Yudha ◽  
Hasan Akhyar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain Analysis ◽  
Dynamic Loads ◽  
Stress And Strain ◽  
Mechanical Hand ◽  
Element Method

Nonhomogeneous Ventricular Wall Strain: Analysis of Errors and Accuracy

1993 ◽  
Vol 115 (4B) ◽  
pp. 497-502 ◽  
Author(s):  
Lewis K. Waldman ◽  
Andrew D. McCulloch
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Measurement Errors ◽  
Three Dimensional ◽  
Strain Analysis ◽  
Noninvasive Methods ◽  
Single Plane ◽  
Cardiac Deformation ◽  
Cardiac Strain ◽  
Element Method

Nonhomogeneous distributions of strains are simulated and utilized to determine two potential errors in the measurement of cardiac strains. First, the error associated with the use of single-plane imaging of myocardial markers is examined. We found that this error ranges from small to large values depending on the assumed variation in stretch. If variations in stretch are not accompanied by substantial regional changes in ventricular radius, the associated error tends to be quite small. However, if the nonuniform stretch field is a result of substantial variations in local curvature from their reference values, large errors in stretch and strain occur. For canine hearts with circumferential radii of 2 to 4 cm, these errors in stretch may be as great as 30 percent or more. Moreover, gradients in stretch may be over- or underestimated by as much as 100 percent. In the second part of this analysis, the influence of random measurement errors in the coordinate positions of markers on strains computed from them is studied. Arrays of markers covering about 16 cm2 of ventricular epicardium are assumed and nonuniform stretches imposed. The reference and deformed positions of the markers are perturbed with Gaussian noise with a standard deviation of 0.1 mm, and then strains are computed using either homogeneous strain theory or a nonhomogeneous finite element method. For the strain distributions prescribed, it is found that the finite element method reduces the error resulting from noise by about 50 percent over most of the region. Accurate measurements of cardiac strain distributions are needed for correlation with and validation of realistic three-dimensional stress analyses of the heart. Moreover, with the advent of increasingly effective noninvasive methods to measure cardiac deformation such as magnetic resonance imaging, the use of nonhomogeneous strain analysis to determine more accurate strain distributions has increasing clinical significance.

ANSYS Simulation Technology of Pipeline Magnetic Flux Leakage Inspection

2013 ◽  
Vol 718-720 ◽  
pp. 1000-1005
Author(s):  
Li Jian Yang ◽  
Sen Lin Zhang ◽  
Song Wei Gao
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Electromagnetic Field ◽  
Magnetic Flux ◽  
Oil And Gas ◽  
Gas Pipeline ◽  
Magnetic Flux Leakage ◽  
Field Calculation ◽  
Inspection Method ◽  
Flux Leakage

In order to solve the need of the oil and gas pipeline defect quantification in the real-time online defecting, magnetic flux leakage inspection method was applied to oil and gas pipeline inspection. According to the basic theory of the electromagnetic field, finite element solution of electromagnetic field and ANSYS electromagnetic field calculation theory, using the function of ANSYS 's simulation and calculation for magnetic field, three-dimensional finite element model of the oil and gas pipeline defect was built up. Through simulating, the relationship between defect signal and defect size was found, the optimal distance of the hall sensor lift-off value was verified, the best magnetization of leakage magnetic field was discussed, and various factors to influence the magnetic flux leakage signal is analyzed.

Stress Analysis of Arctic Thaw Settlement with Gas Pipeline using Finite Element Method

2014 ◽  
Vol 18 (5) ◽  
pp. 78-84
Author(s):  
Kyung Il Kim ◽  
Kyu Jung Yeom ◽  
Young-Pyo Kim ◽  
Woo Sik Kim ◽  
Kyu Hwan Oh
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Analysis ◽  
Gas Pipeline ◽  
Thaw Settlement ◽  
Element Method

Oil and Gas Pipeline Residual Strength Research Based on Reliability Analysis

2013 ◽  
Vol 318 ◽  
pp. 562-566 ◽  
Author(s):  
Xian Yong Zhang ◽  
Jin Feng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Monte Carlo ◽  
Wall Thickness ◽  
Oil And Gas ◽  
Safety Evaluation ◽  
Residual Value ◽  
Defect Depth ◽  
X80 Steel ◽  
Pipeline Safety

Strength of residual wall thickness reliability was studied by Monte-Carlo and finite element method, based on 40in X70 steel and 48in X80 steel which were often used in oil and gas transport pipeline. Pipe with defects in different residual wall thinkness, calculated the critical residual value of wall thickness, and analysed the defect depth and width of influence on pipe reliability. The results provide basis for pipeline safety evaluation and reasonable replacement.

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