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Journal of Chinese Society for Corrosion and protection  2017, Vol. 37 Issue (4): 305-314    DOI: 10.11902/1005.4537.2016.080
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Research Progress on Cathodic Protection Potential Distribution of Tank Bottom Plate
Jie KOU1,2(), Xince ZHANG2, Gan CUI2, Baoan YANG3
1 Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao Key Laboratory of Circle Sea Oil & Gas Storage and Transportation Technology, China Univeristy of Petroleum, Qingdao 266580, China
2 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
3 China Petroleum and Chemical Corporation, Yulin to Jinan Gas Pipeline Subsidiary, Jinan 250000, China
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Abstract  

Cathodic protection is an important method to prevent the corrosion of tank bottom plate. In this article,the research status in recent decades about the current density- and potential-distribution of tank bottom plate under cathodic protection is summarized. The research status and the relevant issues related with the analytical method and numerical analysis method applied for the status of cathodic protection of tank bottom plates are described and discussed. The authors prospect that the analytical method will be gradually replaced by numerical method, while the mathematical model and boundary conditions need to be further studied and improved. In addition,the combined use of a variety of numerical methods will be a trend in the development of numerical simulation in the future.
Key words:  tank bottom plate      analytical method      numerical method      boundary condition      combined use      cathodic protection     
Received:  20 June 2016     
ZTFLH:  TG174.41  
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These authors contributed equally to this work.
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Jie KOU
Xince ZHANG
Gan CUI
Baoan YANG

Cite this article: 

Jie KOU, Xince ZHANG, Gan CUI, Baoan YANG. Research Progress on Cathodic Protection Potential Distribution of Tank Bottom Plate. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 305-314.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.080     OR     https://www.jcscp.org/EN/Y2017/V37/I4/305

Fig.1  Comparison of measured potential value with calculated potential value[9]
Fig.2  Potential distribution at the tank bottom[10]
Fig.3  Reduced sketch map of the one-side deep-well anode with cathodic protection system[12]
Fig.4  Mesh lattice (a) and typical element (b) used for calculating potential distribution on cathodically protected external tank bottom[22]
Fig.5  2D geometry for FEM analysis[28]
Fig.6  3D geometry for FEM analysis[28]
Test point E (Measured)mV E(Numerical)mV Relative%
A -994 -984 -1.0
B -973 -980 0.7
C -956 -969 1.4
D -940 -947 0.7
E -912 -950 4.0
F -903 -945 4.4
G -893 -965 8.1
H -924 -975 5.5
Table 1  Comparisons of the results of potential distribution (SCE)
Fig.7  Schematic diagram of tank bottom plate grid[1]
Fig.8  Schematic diagram of 2D sacrificial anode CP system[37]
Fig.9  Comparison of BEM calculations and experimental results of potential distribution[37]
Fig.10  Schematic diagram of experimental system[42]
Fig.11  Measuring points on the steel disc[42]
Fig.12  Comparison of simulated data and measured data[42]
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