It is well to emphasize the importance of the proper location and selection of anode systems for use in providing cathodic protection for the mitigation of corrosion on sub-surface structures. The anode is one of the major factors that may be varied or controlled in such a system. This article deals only with anodes placed in the earth’s surface.
The location of an anode oftentimes influences the required size of the anode, the rectifier rating, the power costs, and consequently the cost per mile per year of cathodic protection for an underground structure.
The total circuit resistance of a cathodic unit herein discussed consists of the following:
The resistance of the soil between the points 100 diameters or so from the pipeline and anode is usually considered equal to zero.
The locations of cathodic units on a pipeline system are usually determined by the amount of pipe that can be...
