Cathodic Protection of Offshore Structures Part 2

1977 ◽  
Vol 24 (5) ◽  
pp. 9-15 ◽  
Author(s):  
B.S. Wyatf
Keyword(s):  
Cathodic Protection ◽  
Offshore Structures

BEM Numerical Modeling and Experimental Verification of Cathodic Protection for Offshore Structures

2011 ◽  
Vol 339 ◽  
pp. 617-623
Author(s):  
Zhi Gang Lan ◽  
Bao Rong Hou ◽  
Xiu Tong Wang
Keyword(s):  
Numerical Modeling ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Computer Modeling ◽  
Cathodic Protection ◽  
Experimental Verification ◽  
Offshore Structures ◽  
Sacrificial Anode ◽  
Test Pool ◽  
Good Agreement

The progresses and theoretical methodology of computer modeling of cathodic protection using the boundary element method (BEM) are outlined. To test the effectiveness and accuracy of BEM numerical modeling of cathodic protection for offshore structures, a miniature model offshore jacket with a sacrificial anode was built and put in a test pool full of seawater. Cathodic protection potentials on different positions were measured and compared with the values obtained from computer modeling. The results show good agreement between measured value and numerical simulated value. The factors that led to discrepancy in the two groups of data were discussed.

Cathodic Protection of Offshore Structures

JOM ◽  
1970 ◽  
Vol 22 (3) ◽  
pp. 56-63 ◽  
Author(s):  
Joseph A. Lehmann
Keyword(s):  
Cathodic Protection ◽  
Offshore Structures

Laboratory and Field Characterization of a New Sacrificial Anode for Cathodic Protection of Offshore Structures

CORROSION ◽  
1998 ◽  
Vol 54 (12) ◽  
pp. 1018-1025 ◽  
Author(s):  
S. Rossi ◽  
P. L. Bonora ◽  
R. Pasinetti ◽  
L. Benedetti ◽  
M. Draghetti ◽  
...  
Keyword(s):  
Cathodic Protection ◽  
Offshore Structures ◽  
Sacrificial Anode

Optimization of the Cathodic Protection Design in Consideration of the Temperature Variation for Offshore Structures

CORROSION ◽  
10.5006/2492 ◽  
2017 ◽  
Vol 74 (1) ◽  
pp. 123-133 ◽  
Author(s):  
M.-S. Hong ◽  
J.-H. Hwang ◽  
J.H. Kim
Keyword(s):  
Current Density ◽  
Cathodic Protection ◽  
Computational Analysis ◽  
Corrosion Damage ◽  
Offshore Structures ◽  
Potential Range ◽  
Analysis Tool ◽  
Electrochemical Tests ◽  
Protective Potential ◽  
Mooring Chain

The temperature effect on the current density which closely related to cathodic protection (CP) design was examined using electrochemical tests. A case study of an optimized CP design for the floating production storage and offloading using a computational analysis tool was also performed. The electrochemical test results showed that the current density and the surface resistance of the specimen (EH36) at 28°C are lower and higher, respectively, compared with the 5°C condition; this phenomenon is the result of a calcareous deposit that was verified by scanning electron microscopy and energy dispersive x-ray spectroscopy surface analyses. The polarization curves which contained the effect of calcareous deposits according to the temperature were used as the computational analysis input data. The simulation results showed that the structure under the 5°C condition did not satisfy the CP criteria (−800 mVSCE to −1,050 mVSCE) at the bottom shell and the mooring chain. It had higher potential than −800 mVSCE. Although the structure at 28°C satisfied the protective potential range, it was sufficiently unstable for the prediction of the corrosion damage. To optimize and resolve the identified problems, the CP design was changed by CP methods, anodes quantities, and anodes distribution. Consequently, the structure at 5°C is sufficient for the satisfaction of the protective-potential criteria (< −800 mVSCE) at the bottom shell and the mooring chain. In the case of the structure at 28°C, a more-even potential distribution was achieved.

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