Optimization On Regional Cathodic Protection For Station

Pipeline network is facing more serious corrosion risks than that of long-distance pipeline,because the pipeline buried in the station more complex.So cathodic protection system is needed to prevent the pipes from corroding.Due to the limited space and complex arrangement,the phenomenon of interference and shield will occur among the pipes.As a result,the available design variables are the number of anodes and their locations.A numerical model has been developed to address the need to understand how cathodic protection systems behave in the complicated installations found today.In this paper,through construcing three-dimensional geometric model for the actual buried pipeline network of station and collecting the experimentally measured cathodic polarization curve as the boundary conditions,use BEASY software simulate the distribution of potential by cathodic protection.And then explan the reason for the protection of potential distribution.Combined the field research and software to prove that it’s essential to setup cathodic protection system for the pipeline network.Compared sacrificial anode potection with impressed current protection under the environment of high resistance,The conclusion is that impressed current cathodic protection will be more appropriate to high resistance environment.One possible measure to help minimize the costing and interference effect is to bury the anodes at a greater position and output a better current.Research how the material of anode,the position of anode and output current anode effect the distribution of potential to the buried pipes underground.The simulation show that aluminum anode as sacrificial is better than that of zinc anode in high resistance environment.Otherwise,with the depth of sacrificial anode increasing,potential present U-shape distribution,but the homogeneity is better.When using impressed current protection,through increasing protection current can significantly reduce the protection potential,but result to the inhomogeneity potential distribution and waste.The vertical distance between anode bed and pipeline is opposite with amount of potential,but the effection of anode depth is complicated to the potential distribution,so we should collect reasonable position of anode.The last,amount of anode also an important variable to the design of cathodic protection.To the complicated station,deep-well anode or flexible anode is recommended to protect buried pipes.In addition,cathodic protection always be affected by grounding grid.This article propose that combined sacrificial anode protection with impressed current protection can effectively solve the interference of the grounding grid.