ON TECHNOLOGY OF DETECTING PIPELINE SITES WITH BENDING VOLTAGES IN THEIR CROSSING GEODYNAMIC ZONES

Abstract

The relevance. There are thermonuclear reactions inside the Earth. This causes displacement of the earth's surface. In the areas of shear tectonic plates – geodynamic zones – there is a change in position of underground pipelines. Changing the position of the main pipeline leads in its turn to a change in its stress-strain state. After activation of the faults, the blocks start moving. At first they move slowly, then the rate of movement increases, the pipelines that are under long-term operation get into the risk zone, so the control of the stress-strain state of the pipelines at the intersections with the geodynamic zones is relevant. The main aim of the research is to develop and implement a technology for identifying sections of pipelines at their intersection with geodynamic zones, providing for identification of potentially hazardous areas to assess the stress-strain state of the pipe. The objects: areas of passage of the main pipelines on the territory of the Republic of Bashkortostan at the intersections with geodynamic zones. Methods: analysis of the results of in-line inspection with measurement of bending radii of pipelines, identification of potentially dangerous areas, analytical calculation of the stress-strain state of pipelines. Results. The paper introduces the technology of revealing sections of pipelines with flexural stresses at their intersection with geodynamic zones. The technology involves determination of actual position of the main pipeline, direct measurement of the bend radius. Having the data on the sections of pipelines with non-normative bending radii of 500D and less the authors have proposed to identify potentially hazardous areas from the reports on in-line flaw detection in the work; re-skip of in-tube flaw detectors, every 2–3 years will allow estimating the dynamics of the change in bend radii, and identifying as well active geodynamic zone.

Keywords

• main pipeline
• geodynamic zon
• stress-strain state
• potentially dangerous area
• bending radius