Keyword: «gas pipeline»

Oil and gas production and processing facilities and the trunk pipeline system of the Republic of Sakha (Yakutia) have been built and are operating in the Arctic, where the elimination of the consequences of accidents requires significant material and time resources. The work considered, the fracture of the main gas pipelines in violation of the technology of manufacturing pipes (manufacturing defects), during long-term operation (corrosion defects), during the degradation of perennial frozen soils with the strain of the pipeline and shut-off reinforcement; the fracture of tanks for petroleum products with an uneven base precipitate from defects; the fracture of the wind-energy tower TW-250 from the fatigue crack. It is shown that the causes of accidents on the metal structures of the Arctic during long-term operation are corrosion damage on underground pipelines, fatigue cracks on tanks and gas pipelines, uneven base precipitate of the reservoirs, the formation of areas with the non-projective position of pipelines due to the degradation of perennial frozen soils.

This article discusses the seasonal fluctuation of the pipe of the underwater passage of the main gas pipeline on the section of the Khatasskaya channel of the Lena River, during the re-formation of the main channel.Special attention is paid to the section of the coastal slope where seasonal exogenous processes occur in the form of frost heaving and thawing of the soil, which directly affect the stress-strain state of the main gas pipeline. The choice of the left bank is directly related to the fact that the layer of seasonal freezing, starting from the near-rim plot, interlocks with the zone of permafrost soils. To determine the seasonal fluctuations of the two lines of the main gas pipeline, the method of surveying the planned-high-altitude position of the pipeline was used. It is noted, that oscillations can reach up to two meters vertically, seasonally moving horizontally to the channel of the Khatasskaya channel.

The article considers the instrumental survey methods and their peculiarities for underwater pipeline crossings (UPC) located in a sharply continental climate. The following instrumental survey methods are described: profile sounding using the OKO-2 GPR, examination of the Lena River bottom in the area of the underwater crossing of the main gas pipeline (MGP) using Hydra 500E side-scan sonar, determination of the actual planned-high-altitude position of the floodplain part of the underwater gas pipeline employing the RD-8000 line locator. It is shown that there is a practical set of equipment that makes it possible to perform planned and real-time monitoring of the state of the UPC almost all year round, despite the unfavorable climatic conditions and the extension of some UPCs in Central Yakutia.