METHOD OF DETERMINING TANGENTIAL STRESS IN STEEL PIPELINES Russian patent published in 2014 - IPC G01L1/00 

FIELD: electricity.

SUBSTANCE: method of determining tangential stress in steel pipelines involves making a sample in form of a hollow cylinder from the same material as the structure; step by step loading of the sample; measuring coercitive force indicators at each loading step, with a defined orientation of magnetic flux generated in the coersimeter relative the sample; obtaining a relationship between the coercitive force indicators and values of stress in the sample; measuring the coercitive force indicators of the metal of the structure; determining stress values using the obtained relationship; tangential stress in the sample is generated by applying torque to the sample; the coercitive force is measured along the axis of the sample or the pipeline twice, while directing magnetic flux in opposite directions. The coercitive force indicator used when determining tangential stress is the magnitude of the difference between measured values of the coercitive force.

EFFECT: high accuracy of determining tangential stress in surface steel pipelines.

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