Non-destructive testing of underground pipelines corrosion protection

A technology for determining the distribution of cathodic electrochemical protection current and the pipe-to-ground transition resistance for quantitative assessments of the insulating coating condition on various sections of underground pipelines (UP) is presented. The possibility of prompt detection of areas with unsatisfactory UP insulation based on the electromagnetic method of non-contact current and contact measurements of potential for diagnostic examinations, condition monitoring and damage detection of anti-corrosion protection of underground steel pipelines is shown.