Abstract
Impressed current cathodic protection has been applied for protection of internal corrosion of steel pipes carrying sea water at N Co. and M Co. Diameters of pipes are in the range of 10-36 in. Higher current densities and larger anode distances than standard values, which were published by J. H. Morgan in Corrosion, Vol. 15, No. 8, are selected to reduce initial investment. Pipe to water potential at the midpoint of anodes was measured against zinc reference electrode. All sea water steel pipes at N Co. are successfully protected, but the results at M Co. were not satisfactory except 14 in diameter pipe line. The experiment will be continued to improve the performance of unsatisfactory pipes at M Co.
