Use of the Microcomputer for Calculation of the Distribution of Galvanic Corrosion and Cathodic Protection in Seawater Systems

2009 ◽  
pp. 53-53-26 ◽  
Author(s):  
DJ Astley
Keyword(s):  
Cathodic Protection ◽  
Galvanic Corrosion

Cathodic Protection of Grounding Grids

2018 ◽  
pp. 248-286
Keyword(s):  
Cathodic Protection ◽  
Galvanic Corrosion ◽  
Steel Corrosion ◽  
Uniform Corrosion ◽  
Grounding System ◽  
Grounding Grid ◽  
Grounding Grids ◽  
Corrosion Pitting ◽  
Impressed Current ◽  
Cathodic Protection System

This chapter contains the corrosion theory of grounding electrodes and basic electrochemistry in corrosion reactions. It contains also the forms of substation grounding grid corrosion (uniform corrosion, pitting corrosion, galvanic corrosion, microbial influenced corrosion), survey on corrosion rate of substation grounding grid, copper and steel corrosion rates, corrosion protection methods (coating, cathodic protection [CP]). The chapter contains also the methods of applying cathodic protection in grounding grids, anode selection, anode spacing, and impressed current in the grounding grid cathodic protection. Finally it contains the required information for design grounding system cathodic protection and sacrificial anode (galvanic) cathodic protection system design steps.

Optimal Design of Galvanic Corrosion Protection Systems for Offshore Wind Turbine Support Structures

CORROSION ◽  
10.5006/2688 ◽  
2018 ◽  
Vol 74 (7) ◽  
pp. 829-841
Author(s):  
Ali Sarhadi ◽  
Asger Bech Abrahamsen ◽  
Mathias Stolpe
Keyword(s):  
Cathodic Protection ◽  
Galvanic Corrosion ◽  
Cost Optimization ◽  
Optimization Procedure ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Fe Model ◽  
Dogger Bank ◽  
Protective Potential ◽  
Protection Systems

The current work addresses a mass/cost-optimization procedure for galvanic anode cathodic protection systems based on both cathodic protection (CP) standards and numerical simulation. An approach is developed for optimizing the number and dimensions of the galvanic anodes, distributing the optimized anodes on the support structure, and finally evaluating the protective potential on the structure during the lifetime by using finite element (FE) software. An algorithm based on sequential quadratic programming is used for optimizing the number and dimensions of the anodes. Both simplified and detailed models are suggested for calculating the protective potential on the structure. The simplified model is selected based on its advantages in terms of calculation time and compatibility with DNV standard data. A time-dependent FE model is used to take into account the electrical isolation degradation of the structure coating as well as the mass reduction of the anodes during the CP lifetime. The performance of the proposed optimization process is examined on a mono bucket inspired (with some simplifications) by the Dogger Bank metrological mast in England. The optimized designs for different coating and anode types are compared and the best designs in terms of both cost and protective potential during the lifetime are suggested. The achieved results show that the proposed optimization procedure can reduce the cost of the CP system around 70% compared to the original non-optimized CP design of the Dogger Bank metrological mast. Furthermore, evaluating the time-evolution performance of the CP systems can reduce their lifetime uncertainty.

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