Method for predicting residual life of storage tank

Abstract

The invention relates to a method for analyzing the residual life of a storage tank through ANSYS software. The method mainly comprises the following steps that (1) a computer supporting ANSYS is used, collected storage tank data are input to the computer in the form of a database or a text, a finite element model of the corroded storage tank is established through the ANSYS software, and corresponding boundary conditions and an external load are applied to the finite element model according to the actual stress condition of the storage tank; (2) regression processing is conducted on experimental data points through a fatigue crack propagation law Paris formula, and a corrosion fatigue rate equation under the corresponding conditions is obtained; (3) the critical invalid wall thickness when the storage tank loses efficacy is determined according to a predicted value of the corrosion rate; (4) according to the critical invalid wall thickness when the storage tank loses efficacy due to corrosion, a storage tank residual life prediction model is established, and the approximate analysis method is used for calculating the residual life of the storage tank under the condition of uniform corrosion.

Description

technical field [0001] The invention relates to a method for predicting the remaining life of a storage tank, which is applied to the maintenance and replacement of storage tanks under fatigue stress and corrosion environments, and predicts and evaluates the remaining life through a corrosion fatigue model, belonging to the technical field of pressure vessel safety. Background technique [0002] With the advancement of science and technology and the rapid development of industry, storage has gradually become an indispensable part of the industrial production process. In order to facilitate the transportation, storage, collection and addition of raw materials, products or intermediate products, various storage containers must be used, such as tanks (vehicles) and liquid storage tanks for the transportation and storage of liquefied petroleum gas. As an important storage equipment, storage tanks have been more and more widely used and paid attention to in industrial production ...

AI Technical Summary

Problems solved by technology

Generally, under the action of cyclic loads and working in a corrosive environment, it is very easy to be corroded and form corrosion defects, which will cause local thinning of the storage tank wall, reduce the effective strength of the storage tank, shorten the service life of the storage tank, and even make the tank wall thinner. The entire storage tank is scrapped, so it is very important to grasp and control its defect degree

Due to the fact that there is no specific formula for the calculation of storage tank life in theory, and due to the limitation of indoor test conditions, it is impossible to conduct research on the corrosion life of storage tanks for a long time. In addition, the environment of storage tanks is complex and changeable. Limited field data on tank life

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