Finite Element Analysis and Research on Corrosion Defect of Tank Floor

2016 ◽  
Vol 853 ◽  
pp. 514-518
Author(s):  
Zhi Jun Yang ◽  
De Shu Chen ◽  
Liang Chen ◽  
Yu Zhuo Liu ◽  
Ran An ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Magnetic Flux ◽  
Magnetic Flux Leakage ◽  
Bottom Plate ◽  
Element Analysis ◽  
Corrosion Defect ◽  
Leakage Magnetic Field ◽  
Leakage Field ◽  
Flux Leakage

Storage tank is an essential vessel in petrochemical industry, and the corrosion of tank is an important reason for the safety hazard. The corrosion of tank bottom plate is more serious than the tank wall, and it is not easy to check and repair, when damaged to a certain extent it will cause the leakage of the media, then lead to waste of energy, environmental pollution, at the same time it will cause a major accident. Magnetic flux leakage testing is widely used in the field of tank floor inspection with the advantages of fast scanning speed, accurate results and so on. In this paper, the finite element simulation and analysis of the corrosion defect leakage magnetic field is used to obtain the data, and the characteristic of the leakage magnetic field is extracted. The effect of defect depth and width and shape on the magnetic flux leakage field is studied, and the distribution curve of the magnetic flux leakage field is obtained.

Finite Element Analysis of Magnetization Reversal Effect Based on Ferromagnetic Specimens

2014 ◽  
Vol 620 ◽  
pp. 127-132
Author(s):  
Xiao Wen Xi ◽  
Shang Kun Ren ◽  
Li Hua Yuan
Keyword(s):  
Magnetic Field ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Magnetic Flux ◽  
Magnetization Reversal ◽  
Tensile Load ◽  
Magnetic Flux Leakage ◽  
Element Analysis ◽  
The Magnetic Field ◽  
Flux Leakage

Using large finite element analysis (FEA) software ANSYS, the stress-magnetization effect on 20# steel specimens with different shape notches is simulated under the geomagnetic field and tensile load. With the stimulation, the magnetic flux leakage fields at certain positions of the surface specimen were measured. Through analysis the relationship between the magnetic flux leakage fields of certain points with tensile stress, the results showed that the magnetic field value at certain positions of specimen surface first decreases and then increases along with the increase of stress, which is called magnetization reversal phenomenon; Different gaps and different positions of the specimen show different magnetization reversal rules; By measuring the maximal variation of the magnetic field value △Hmax at certain positions of the surface specimen and by analyzing its change law, we can roughly estimate specimen stress size and distribution regularity of stress. Moreover, this article also discusses the effect of lifts-off of the probe on the law of stress magnetization.

Numerical and Experimental Research on Pipeline Magnetic Flux Leakage Testing With Inspection Device of Variable Diameters

2017 ◽  
Author(s):  
Liu Yanlei ◽  
Wang Hong ◽  
Yang Xiangyue ◽  
He Chengdai ◽  
Wei Xinhua ◽  
...  
Keyword(s):  
Finite Element ◽  
Magnetic Flux ◽  
Engineering Application ◽  
Magnetic Flux Leakage ◽  
Analysis Model ◽  
Element Analysis ◽  
Leakage Magnetic Field ◽  
Different Diameters ◽  
Flux Leakage ◽  
Magnetic Flux Leakage Testing

Finite element analysis model of magnetic flux leakage testing outside pipeline was established with analysis software in this paper. The leakage magnetic field characteristic curves of defects were obtained using this model. Also, the simulation on different diameter and depth of the cylindrical defects was carried out. And influence on flux leakage field, such as depth of defects corrosion defects was gotten. Then, detection device which can do inspection on pipeline with different diameters was manufactured based on the theory and finite element calculation results. The experiments with this device were carried out on the wall thickness of 8 mm and 6 mm pipeline with artificial defects above or under. And the results showed good agreement with simulation which meets engineering application of pipeline inspection.

Finite Element Analysis and Experimental Research for Horizontal Tank to Internal Magnetic Flux Leakage Detection

2014 ◽  
Vol 599-601 ◽  
pp. 321-325
Author(s):  
Li Qiang Sun ◽  
Hong Bo Zhu ◽  
Ming Xie ◽  
Ji Xia Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Magnetic Flux ◽  
Magnetic Flux Leakage ◽  
Leakage Detection ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Horizontal Tank ◽  
Flux Leakage ◽  
Detection Effect

In view of the petroleum and petrochemical characteristics of horizontal tank, ANSYS software of finite element analysis was carried out on the horizontal tank within the magnetic flux leakage testing, analyzes the influencing factors of defect magnetic flux leakage signals. Experiments verify the finite element analysis results, the experimental results show that the research of horizontal tank within the magnetic flux leakage detection effect is obvious.

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.

Finite Element Analysis on Magnetic Flux Leakage of Interior Permanent Magnet Generator for Vehicle

2011 ◽  
Vol 66-68 ◽  
pp. 483-488 ◽  
Author(s):  
Xue Yi Zhang ◽  
Hong Bin Yin ◽  
Li Wei Shi
Keyword(s):  
Finite Element ◽  
Magnetic Flux ◽  
Permanent Magnet ◽  
Structural Design ◽  
Magnetic Flux Leakage ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Interior Permanent Magnet ◽  
Leakage Coefficient ◽  
Flux Leakage

In order to solve the problem that no-load magnetic flux leakage coefficient is not accurate when it is calculated by the method of magnetic circuit, a model of interior permanent magnet(IPM) generator with 36 slots for vehicle was built through the finite element method of the ANSYS, and then a means of calculating the IPM generator’s magnetic flux was put forward after analyzing the magnetic flux leakage conditions of different rotor structures under the circumstance of not changing stator structure. The ralationships among the pairs of poles, the magnet width, the thickness of non-magnetic sleeve, the length of air-gap and the magnetic flux leakage coefficient were obtained, and they provided forceful guidance for the structural design of IPM generator.

Three-axis magnetic flux leakage in-line inspection simulation based on finite-element analysis

2013 ◽  
Vol 22 (1) ◽  
pp. 018103 ◽  
Author(s):  
Jian Feng ◽  
Jun-Feng Zhang ◽  
Sen-Xiang Lu ◽  
Hong-Yang Wang ◽  
Rui-Ze Ma
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Magnetic Flux ◽  
Magnetic Flux Leakage ◽  
Element Analysis ◽  
Simulation Based ◽  
Flux Leakage

ANSYS Simulation Analysis of the Tri-Axial Pipeline Magnetic Flux Leakage In-Line Inspection

2012 ◽  
Vol 490-495 ◽  
pp. 2086-2090
Author(s):  
Li Jian Yang ◽  
Yan Xiu Su ◽  
Song Wei Gao
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Magnetic Flux ◽  
Simulation Analysis ◽  
Magnetic Flux Leakage ◽  
Ansys Simulation ◽  
Leakage Magnetic Field ◽  
Simulation Results ◽  
Flux Leakage ◽  
Three Components

In order to improve the detect performance of the traditional pipeline magnetic flux leakage(MFL) in-line inspection tools, the method of tri-axial pipeline MFL in-line inspection is advanced. By the three leakage magnetic field components: axial, radial and circumferential, the pipeline defects are recognized. Applying finite element method to build the simulation model of pipeline MFL in-line inspection, then proceeding 3-D simulation analysis. The three components of leakage magnetic field (axial, radial and circumferential) can be obtained by using ANSYS 3-D simulation, and the pipeline defects’ existence as well as the change of the defect’s size can be estimated by the three components’ graph. The simulation results indicate: By the ANSYS 3-D simulation, it proves that the tri-axial pipeline MFL in-line inspection can be achieved and the inspection can be used to improve the level of traditional pipeline MFL in-line inspection.

3D Finite Element Analysis for Magnetic Flux Leakage Testing

2011 ◽  
Vol 201-203 ◽  
pp. 1623-1626
Author(s):  
Qiang Song
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Magnetic Flux ◽  
Three Dimensional ◽  
Magnetic Flux Leakage ◽  
Destructive Testing ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Flux Leakage

Magnetic flux leakage (MFL) is a non-destructive testing method used to inspect ferrous materials. However, apparatus parameters could affect the MFL inspection tool’s ability to characterize anomalies. In this paper, MFL signals obtained during the inspection of pipes have been simulated using three-dimensional finite element analysis and the effects of magnet assembly on MFL signals are investigated. According to numerical simulations, an increase in the leakage flux amplitude is observed with an increase in the permanent magnet size and the inflexion point may indicate the presence of magnetizing pipe wall to near saturation. It clearly illustrates degradation in the MFL with increasing backing iron length. The relationship between MFL apparatus parameters and MFL signals could be utilized in the MFL technique to characterize the defect.

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