Evaluation of Stress-strain State of Steel Cylindrical Tank with Dent Defect

摘要

Oil steel vertical tanks are among the most dangerous objects in the system of main pipeline transport of oil. Various type defects may appear during maintenance of the tanks. Defects reduce the reliability of the tank and lead to accidents of varying severity. It should be noted that a significant part of the tank farms of Russia have practically exhausted its service life (25-30 years) or haves defects, which are not permissible according to the standard documentation. On the one hand, overhaul or dismantling requires significant material costs. On the other hand, the occurrence of accidents at cylindrical steel tanks in most cases is accompanied by significant loss of oil, ground contamination and loss of life. Thus, the problem of prediction of operational reliability and durability of tank structures is actual; its solution will ensure accident-free operation of tanks. The work is devoted to solving the problem of the safety operation of steel vertical cylindrical tanks by the example of the analysis of stress-strain state of steel vertical tank with capacity 5000 m~3 with a defect the dent with allowance for its operating loads, geometry and defect location in the tank structure using finite element modelling.