Дослідження тренду втомної міцності з метою оцінки залишкового ресурсу нафтопроводу "Одеса-Броди"

Abstract

Any element of main oil pipeline is assigned to perform set functions in the appropriate production and maintenance conditions. These functions are realized in the working technical state, which is characterized by the range of structural parameters the values of which are within set borders. Structural parameters are controlled by measuring diagnostic parameters and evaluation of high-quality signs of the technical state of the element. All reliability indexes, eventually, depend on the technical state of the linear part of oil pipeline, stability of its structure, term of storing values of parameters of the technical state in the set scopes. Excess by at least one structural parameter of maximum value means the violation of integrity or working adequacy of oil pipeline. Among a great number of indexes that characterize the technical state of the linear part of oil pipeline, there are those the change of which to a great extent affects the resource of the system. Nowadays the use of trend criteria conformities in order to determine the remaining resource is rather essential. The influence of fatigue strength and fracture toughness of the pipe steel mark 13G1SU on the remaining resource of «Odesa-Brody» is investigated in the article. Functional dependences of steel fatigue resistance criterion from time of exploitation that provide an opportunity to estimate the remaining resource of oil pipeline are developed.