Studies On Cathodic Protection Modeling For Offshore Jackets

well as the size variation of sacrificial anodes with time were vividly presented, whichprovides a new method to evaluate CP systems of offshore structures.(2) Based on the modeling of CP potential and current density as well as the calculation ofsacrificial anode consumption, evaluations of the CP systems and predition of remaining lifeof sacrificail anodes were achieved.(3) Validation tests were designed and conducted by using a miniature model offshore jacketwith sacrificial anode sitting in a testing pool full of seawater to simulate CP behavior in realseawater. The numerically modeled potential ditribution was compared with the actualpotential measuremen to show the validation of CP modeling with BEM.(4) The CP modeling technology was applied to real jackets of big and complex structure. Themodeled solution was compared with the data acquired with CP monitoring devices, whichprove the validity of BEM CP modeling.(5) Pilot studies were conducted to numerically model the initial polarization of steel structuresafter they entered the seawater, which provided a helpful tool to evalute the designing of CPinitial current.The achievements of the study in this paper demonstrate that it is feasible and reliable toemploy CP modeling technology to help and evalute the CP designing of offshore structures. Thetechnology not only serve as a reference for CP designing but also supplement and enrich theexisting CP evaluation technologies. The validity of it was proved in practice.