Effects of Nonuniform Settlement of the Outer Bottom Perimeter of a Large Tank on its Stress-Strain State

Тарасенко, А. А.; Konovalov, P. A.; Zekhniev, F. F.; Chepur, Petr; Тарасенко, Д. А.

doi:10.1007/s11204-017-9420-1

Cited by 13 publications

(8 citation statements)

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“…To calculate the stress-strain state of the VST-20000 tank at the maximum values determined in [14], the authors suggest using the finite element model for a storage tank developed in [15]. Based on the model developed with the ANSYS Workbench 16.1 software, it is possible to determine equivalent stresses and strains of VST metal structures when specifying settlement parameters -length of the uneven settlement zone and vertical component [16][17][18].…”

Section: Experimental Partmentioning

confidence: 99%

Modeling of storage tank settlement based on the United States standards

2018

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Abstract. Up to 60% of storage tanks in operation have uneven settlement of the outer bottom contour, which often leads to accidents. Russian and foreign regulatory documents have different requirements for strain limits of metal structures. There is an increasing need for harmonizing regulatory documents. The aim of this study is to theoretically justify and to assess the possibility of applying the U.S. standards for specifying the allowable settlement of storage tanks used in Russia. The allowable uneven settlement was calculated for a vertical steel tank (VST-20000) according to API-653, a standard of the American Petroleum Institute. The calculated allowable settlement levels were compared with those established by Russian standards. Based on the finite element method, the uneven settlement development process of a storage tank was modeled. Stressstrain state parameters of tank structures were obtained at the critical levels established in API-653. Relationships of maximum equivalent stresses in VST metal structures to the vertical settlement component for settlement zones of 6 to 72 m in length were determined. When the uneven settlement zone is 6 m in length, the limit state is found to be caused by 30-mm vertical settlement, while stresses in the wall exceed 330 MPa. When the uneven settlement zone is 36 m in length, stresses reach the yield point only at 100-mm vertical settlement.

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Section: Experimental Partmentioning

confidence: 99%

Modeling of storage tank settlement based on the United States standards

2018

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“…The thawing of frozen soil, depending on the amount of ice, causes subsidence or complete creeping of dikes. In this case, both uneven subsidence and expulsion of structural elements by frost heaving are observed [1][2][3][4]. In such engineering-geological conditions, the ESPO and Zapolyarye-Purpe-Samotlor oil pipelines were designed and built.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the economic efficiency of major repairs of the tank foundation by the displacement method

et al. 2019

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The article features the application of a method of displacement during major repairs of vertical steel tank bases. Premises on the effectiveness of the application of the displacement method for repairing the bases of vertical steel tanks in comparison with the traditional method of repair are put forward. The comparative characteristics of the displacement method and the traditional method of major repairs of the bases of vertical steel tanks are given. The authors proposed a method of temporary displacement of vertical steel tanks, which is new for Russian practice of major repairs. An algorithm for calculating the cost-effectiveness of repairing the bases of VSTs is developed both by the traditional method and by the displacement method proposed by the authors. Technical solutions are substantiated considering calculating the stress-strain state of tank structures under nonaxisymmetric loading. A model is formed and basic parameters of the economic efficiency evaluation of major repairs of the vertical steel tank base are determined. Evaluation of the economic efficiency of major repair procedures and further maintenance of the repaired tank bases is carried out. A high economic efficiency of the new technological method of displacement is proved in comparison with the traditional method.

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“…), an idealized case is calculated, which does not reflect the geometric imperfections of the form during construction, deviation of the base marks from the design due to possible defects of CIWs, etc. These factors, according to [4][5][6][7][8][9], affect the total SSS of the tank and, ultimately, the occurrence of limit states.…”

Section: Introductionmentioning

confidence: 99%

Determination of the region of the limiting states occurrence in RVS-20000 with the subsidence of the external bottom contour

Chepur

Тарасенко

Gruchenkova³

2018

MATEC Web Conf.

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The problem of the limiting states occurrence in the structures of a vertical steel tank is investigated in this work. To study the SSS of the metal structures of the object, the authors created a numerical model of the RVS-20000 tank in the ANSYS software complex. The model considers the maximum number of elements with their geometry and connections affecting the tank SSS under non-axisymmetric loading, including beyond the elasticity of steel. Dependences between the parameters of intrinsic stiffness of the VST are obtained. The results of the finite element analysis made it possible to develop a technique for assessing the technical condition of the structure with the development of irregular subsidence of the external bottom contour. The proposed technique can be used by both operating and design organizations in making managerial decisions regarding the repair of RVS-20000 subjected to the base subsidence.

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Effects of Nonuniform Settlement of the Outer Bottom Perimeter of a Large Tank on its Stress-Strain State

Cited by 13 publications

References 0 publications

Modeling of storage tank settlement based on the United States standards

Modeling of storage tank settlement based on the United States standards

Analysis of the economic efficiency of major repairs of the tank foundation by the displacement method

Determination of the region of the limiting states occurrence in RVS-20000 with the subsidence of the external bottom contour

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