Physical and Mechanical Aspects of Corrosion Damage of Distribution Gas Pipelines After Long-Term Operation

The fractographic analysis of the corrosion damage of the pipe surface of the distribution gas pipeline after 40 and 56 years of operation is performed. The mechanisms of formation of corrosion pits, laminations, and deep crack-like defects are systematized. On the basis of laboratory studies, which simulate operation conditions of a distribution gas pipeline in corrosive medium, the basic regularities in general corrosion of steel St. 3 in neutral chloride electrolytes are determined, depending on the value of the current density and chemical composition of the medium.