Being corrosion-proof manner of the asphalt covered sheath inside of pipe asphalt covered embedding tube and

摘要

PROBLEM TO BE SOLVED: To permanently or semipermanently prevent corrosion of a coated metal buried pipe in a double pipe wherein the coated metal buried pipe is disposed inside a coated sheath pipe.;SOLUTION: In this corrosion protection method and device for the coated metal buried pipe inside the coated sheath pipe, a sacrifice positive electrode is disposed along the buried pipe inside the sheath pipe.;COPYRIGHT: (C)2003,JPO