DOI: 10.24411/2076-6785-2020-10085
Abstract
The paper presents the results of monitoring the safety factor of linear sections in different years of operation of the main gas pipeline. The actual values of the reserve coefficient are calculated taking into account the laws of distribution of excess internal pressure and temperature drop in the studied areas, which are individual for each year of operation, as well as the random nature of the yield strength of the pipe material. Based on the obtained results of monitoring the values of the reserve coefficient, the actual level of reliability is estimated and the safety class of the linear section sections is justified for different periods of time at the stage of operation of the main gas pipeline. The necessity of taking into account the random variation of the safety factor values established as a result of monitoring within the same sections for different periods of operation of the main gas pipeline when planning the strategy of its operation, maintenance and repair is justified.
Materials and methods
The design values of the reserve coefficient for sections of the main gas pipeline are calculated in accordance with the requirements of SNiP 2.05.0685* (Main pipelines). Experimental studies of the mechanical characteristics of the material of pipes made of steel 17G1C, performed in accordance with the requirements of GOST 1497-84. (Metals. Tensile testing methods). Regularities of changes in the yield strength of pipe metal are obtained based on processing of experimental results using nonparametric statistics. The actual values of the safety margin coefficient and the current level of reliability of sections of the main gas pipeline were estimated according to the STO of PJSC Gazprom 2-2.3-184-2007.
Keywords
monitoring, main gas pipeline, linear section, safety factor
