The relevance of research. At present, the role of activities aimed to improving the reliability of equipment in the main pipeline transport of natural gas is growing. The factor that negatively affects the reliability of operation of compressor stations equipment of main gas pipelines is the increased vibration due to various reasons. One of these reasons is the combination of certain geometric dimensions of pipelines and high flow of process gas. The aim of the research is to define the modes of a compressor manufactory with 8 full-pressure units to reduce the intensive dead-end oscillation observed in off-cycle compressor units’ piping. Object: pipeline communications section of the compressor station from the cyclone dust collectors to the inlet manifold of the compressor manufactory, tees with branches to the gas-pumping unit, switched off by cranes No. 1 from the inlet manifold. Methods: vibration diagnostics of piping at the existing compressor station; mathematical modeling of operating modes of the compressor manufactory using a numerical solution (hydraulic calculation in combination with the calculation of natural frequencies and frequencies of the driving force). Findings. The paper proposes a method for eliminating dead-end oscillations within the scope of operation, specifying the requirements of regulatory documentation. The methodology for estimating the conditions of dead-end oscillations appearance is developed. It is based on the hydraulic calculation of a high-pressure loop gas pipeline with selections. Two modes of a compressor manufactory with 8 full-pressure units with a capacity of 100 million m3 / day are considered to detuning from resonance. As a result of the calculations, the number of gas-pumping units from the edge of the compressor manufactory, that must be operated to eliminate dead-end oscillations, has been reduced in comparison with the recommendations of normative documentation. This allows putting the second gas-pumping unit from the edge of the compressor manufactory into reserve and, consequently, reducing the operating time of this gas-pumping unit while eliminating the high dead-end oscillations of the piping.
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