Optimization the quantity, locations and output currents of anodes to improve cathodic protection effect of semi-submersible crane vessel

Xing, Shaohua; Li, Y.; Song, Hongqing; Yan, Yong; Sun, Miaomiao

doi:10.1016/j.oceaneng.2015.12.047

Cited by 20 publications

(12 citation statements)

References 7 publications

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“…In this paper, the three-dimensional boundary element method is employed to simulate the corrosion electrostatic field distribution of ship, and the influence of seawater conductivity on corrosion electric field is studied. The electric field distribution is only slightly influenced by conductivity of seawater; however, the electric field intensity decreases as seawater conductivity increases, which can be explained by Equations (15) and (16). The simulation results of BEM model and electric dipole model were compared, and the error of x-component, y-component and modulus were about 10%.…”

Section: Discussionmentioning

confidence: 99%

“…In each iteration calculation, the coefficient matrices of equation are known; therefore, it is only necessary to solve linear equations for each iteration calculation. After the potential distribution of cathode and anode is obtained, the current density distribution is solved by polarization Equation 14, and the electric field is obtained by Formula (15).…”

Section: Basic Equations and Boundary Element Formulationmentioning

confidence: 99%

“…The equilibrium potential of coated carbon steel in seawater is about −0.8 V, and the current density at different potentials is much smaller than the polarization current density of carbon steel and copper alloy. Therefore, the surface of well-coated ship is considered an insulation boundary condition in some literatures [11,15]. Fig.…”

Section: Potentiodynamic Polarization Testmentioning

confidence: 99%

“…BEM was applied to anticorrosion research of offshore engineering structures in the early 1980s [13,14]. Nowadays, it has been widely used in the simulation of cathodic protection system optimization of various marine structural parts such as oil rigs, submarine pipelines and ships [15][16][17]. Wu et al [18] optimized the auxiliary anode position and output current of impressed current cathodic protection (ICCP) by BEM to reduce the corrosion electric field of ship effectively.…”

Section: Introductionmentioning

confidence: 99%

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Simulating Underwater Electric Field Signal of Ship Using the Boundary Element Method

Wang¹,

Xu²,

Zhang³

2018

PIER M

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Seawater conductivity is an important factor that affects the corrosion electric field of ship. A three-dimensional boundary element method (3D-BEM) combined with nonlinear polarization curve was employed to investigate the influence of seawater conductivity on the corrosion electrostatic field. Numerical simulation results show that the electric field distribution is only slightly influenced by the conductivity. However, the intensity decreases with the increases of conductivity. The simulation results of the BEM model were compared with the results of the equivalent electric dipole model, and the results obtained by the two methods had high similarity, which demonstrated that the BEM model was effective. The former is a more convenient and concise modeling method that can better reflect the distribution characteristics of ship's corrosion electric field than the electric dipole model.

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Section: Discussionmentioning

confidence: 99%

Section: Basic Equations and Boundary Element Formulationmentioning

confidence: 99%

Section: Potentiodynamic Polarization Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulating Underwater Electric Field Signal of Ship Using the Boundary Element Method

Wang¹,

Xu²,

Zhang³

2018

PIER M

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“…As ship's static electric field is mainly caused by corrosion and anti-corrosion electric current, there are several common methods to decrease the intensity of electric field, optimizing the structure process [7] , impressed current compensation [8] and Advanced ICCP(advanced impressed-current cathodic protection) [9,11] , et al As the ship's serving time goes longer, the coating condition gradually becomes serious, and thus the electric field signal increases. In order to decrease the electric field more, Advanced ICCP and impressed-current compensation methods are commonly used around the world, like the Russian "Каскад-э" system using impressed-current compensation method, and American "Advanced ICCP" system.…”

Section: Introductionmentioning

confidence: 99%

Research of Ship's Stealth Methods in Static Electric Field

Peng¹,

Jin-fang²,

Jiang³

2017

Proceedings of the Advances in Materials, Machinery, Electrical Engineering (AMMEE 2017)

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In order to decrease the ship's static electric field as much as possible, the ship potential and static electric field are compared under different conditions, natural corrosion, sacrificial anodes protection, normal and advanced impressed-current cathodic protection and impressed-current compensation based on boundary element calculating software. Then a scaled ship model experiment was conducted for the validation of numerical results. The results show that the method based on impressed-current compensation can most effectively decrease the ship's static electric field compared with other methods, but the whole ship areas are not under cathodic protection.

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Numerical simulation and re‐design optimization of impressed current cathodic protection for an offshore platform with biofouling in seawater

Wang

Song

et al. 2017

Materials & Corrosion

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A finite element model (FEM) of the offshore platform with biofouling is developed here to predict the effectiveness of the ICCP under seawater. Remotely operated vehicle (ROV) test verified that the offshore platform was fully covered by a coating‐like biofouling to protect the structures from corrosion. FE‐SEM and EDS tests demonstrated that the biofouling deposits on the offshore platform mainly contained magnesium oxides, biofouling deposits, and corrosion products doped with calcium oxides. The polarization relationships of platform steel with biofouling coverage were used as boundary conditions for the numerical simulation. Furthermore, the factors including output current, anode location, seawater conductivity, and biofouling coverage rate, which influenced the protective effectiveness, were comparatively evaluated by FEM. Then, a re‐design two‐anode ICCP system was employed to keep offshore platform in protective condition. A ROV monitored the potential distributions of the legs and demonstrated that numerical simulation results of ICCP had a good agreement with measured data.

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Optimization the quantity, locations and output currents of anodes to improve cathodic protection effect of semi-submersible crane vessel

Cited by 20 publications

References 7 publications

Simulating Underwater Electric Field Signal of Ship Using the Boundary Element Method

Simulating Underwater Electric Field Signal of Ship Using the Boundary Element Method

Research of Ship's Stealth Methods in Static Electric Field

Numerical simulation and re‐design optimization of impressed current cathodic protection for an offshore platform with biofouling in seawater

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