Hrytsanchuk A. Impact of the formation water and hydrate in corrosion of industrial pipeline

The method of physical modeling of the influence of gas hydrates on the material of the pipeline under the operating thermobaric conditions has been developed and a pilot plant has been created. Based on the combination of Norwegian NORSORK approaches and a group of scientists led by Mohualdin, a mathematical model of intrauterine corrosion was developed based on hydrate formation. According to the results of corrosion-mechanical tests for the first time the laws of joint action of mechanical stresses, concentration of chlorides and hydrate formation on the speed and localization of corrosion processes have been established. The coefficients of the influence of hydrating on general and local corrosion are calculated, which make up 1,13 and 1,32 respectively, which confirms the hypothesis of intensification of local corrosion as a result of hydration formation. Volumetric tests of the pipeline material after exposure in gas hydrate in two circuits have been carried out and the significant effect of gas hydrates on the durability of steel pipelines has been demonstrated. Reduced duration reaches 1.7 times.