«Proceedings of Gubkin University»

Use of tensometry for monitoring the stress-strain state of industrial pipelines

UDC: 621.644+539.3
DOI: -

Authors:

¹ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation
² Gazprom Dobycha Yamburg, Novy Urengoy, Russian Federation

Keywords: pipeline, stress-strain state, permafrost, strain gauge, tensile beam, error

Annotation:

The article addresses the measurement of the stress-strain state of industrial pipelines operated in permafrost conditions. Tensile beams welded onto the pipeline surface in the most critical thawing zones are proposed as a measurement tool. To determine the error in measuring the deformation of the pipeline surface, the study includes measurements of deformations in laboratory samples and a test span of the pipe. During testing, strain gauges were placed on the surfaces of samples, the pipe, and the tensile beam, which was secured using electro-contact welding. Laboratory tests indicated that starting from 26–27 MPa, the error in determining deformation using the tensile beam welded to the sample's surface decreased to 3–5 %. When calculating the stress from uniaxial tension, this deformation error results in a stress calculation error of 4–5 MPa. For bending loads applied to a two-support span of the test pipe, the deformation measurement error in the most strained zone was 2 %.

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