FIELD: servicing steel underground pipe lines; diagnosis of corrosion on pipe lines.
SUBSTANCE: pipe line under test is divided into sections and pit is made at boundaries; then electrical resistance is measured in section and at edge zones of these sections (in pits) by four-electrode scheme. Measured at edge zones are also thickness of pipe wall and its outer diameter. Specific resistance of pipe metal is calculated by these measurements. Electrical resistance of sections is calculated on basis of specific resistance and measured and specified magnitude are compared. Deviation of measured magnitude from specified ones is indicative of corrosion damage on these sections. Current and potential electrodes are located at distance no less than two diameters of pipe for enhancing measurement accuracy.
EFFECT: enhanced accuracy of measurement.
2 cl
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