Research of workability of main gas pipeline "Pavlovsk-Mayya"
Studies were carried out to assess the state and determine the permissible period of safe operation of the main gas pipeline («MG») «Pavlovsk-Mayya» of the JSC «Sakhatransneftegaz» at its most loaded nodes and elements operating under the most unfavorable conditions. A comparison of the standard estimate of the residual life of main gas pipelines with the developed methodology for estimating the residual life of pipelines and reservoirs operating in the Far North is presented. For the studies, the main metal sites were chosen at different sites of the MG. Standard methods for measuring and controlling technical characteristics used in the examination of industrial safety of technical devices were used in the work. The thickness of gas pipeline walls was measured by an ultrasonic thickness gauge «TUZ-2», and the determination of the hardness of the gas pipeline material by a portable hardness tester «TEMP-4» in pits, in open sections and crane assemblies along sections in four planes clockwise along the product. The actual value of the thickness and hardness of the wall is the average result of at least 3 measurements at each point. The MG «Pavlovsk-Mayya» was built and operates in the zone of permafrost spreading. For 12 years, the stable operation of gas pipeline systems provides the main fuel for the village of Mayya, the localities of Chuyya, Khara and Beke and other rural villages and settlements of the Republic of Sakha (Yakutia). The results of the industrial safety examination carried out by the expert organization LLC «ELTEK» were used in the work.