New Methods for the Corrosion Monitoring of Underground Pipelines According to the Measurements of Currents and Potentials

Abstract

Devices for contactless measurement of currents and measurements of electric voltages and polarization potential with determination of coordinates, with microprocessor and computer processing of results considerably increase the efficiency and informativeness of underground pipelines non-destructive testing.

Information Technology of Surveys and Diagnostics of Underground Pipelines

“…New methods and devices of CCM are offered. The equipment of the parallax and gradient types is developed that provides the determination of the location, direction and depth of the pipelines and conductive communications and the measurement of current without connecting to the pipeline and the earth [3,8,9]. The measurement process is carried out automatically; the operation of the equipment is controlled by a microprocessor under a specially designed program.…”

“…A new criterion for detecting UP sections with unsatisfactory insulation at critical current costs was proposed and verified in the field conditions [3,9]. These critical relative current charges Jcr depend on the current frequency f and the specific conductivity of the soil Rog:…”

“…In this article, the complex problem of inspection, control of parameters and diagnostics of the state of underground pipelines [1,[7][8][9] is considered from the standpoint of the structure and functioning of modern cyberphysical systems [3]. The main focus is on controlling the corrosion of the UP, which is crucial for ensuring reliability and prolonging their non-hazardous operation.…”

“…Polarization potential (PP) is considered as the main criterion for protection against corrosion of metal constructions in a conductive medium [1,3,9].…”

“…The measured high-ohm voltmeter potential between a comparison relative electrode (RE) and a metal of a protective design includes, in addition to the polarization component, an ohmic drop in the IR voltage due to the passage of the cathode current I through to the effective resistance R between the comparison electrode and the metal of the structure [1,9]. To overcome the disadvantages of known methods of measurement of PP (compensating, relaxation, stationary auxiliary electrode), [3,9] a new method for measuring the PP (MPP) with the removal of an ohmic component by measuring constant and alternating electric voltages is proposed.…”