The stress-strain state of an underwater offshore gas pipeline and installation of compensators-stops intended to prevent its ascent

Abstract

The brief information contains information about the surfacing of pipes at the underwater crossing of the Bovanenkovo-Ukhta gas pipeline, laid in the Kara Sea, and describes the design features of the concreted pipes. In the formulation of the problem of the stressstrain state (SSS) of the underwater crossing of an offshore gas pipeline, it is conventionally divided into the middle and extreme parts. In the middle part, the pipe is completely flooded and exposed due to the erosion of soil from it. In the extreme underground parts in which expansion joints are installed, the pipe is not exposed; it remains in the trench, covered with soil during the construction of the pipeline. The problem was solved by the finite element method in displacements. Calculations of the SSS of the gas pipeline section were carried out taking into account the uneven settlement of the foundation soil, different values of operating parameters and the installation of compensator stops of various designs. Using a numerical experiment, critical values of operating parameters were found and the effective operation of compensator stops of various designs was revealed. Keywords: gas pipeline; concreted pipe; soil; bending; deflection; stress; pressure; force; ascent; compensator-stop.