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Technical Brief

A Nonlinear Finite Element Study on Settlement and Releveling Procedure of a Large Deformed Steel Tank

[+] Author and Article Information
H. Ayari

Stress Analyst
Department of Mechanical Engineering,
Ultragen Ltd.,
50 Rue de Lauzon,
Boucherville PQ J4B 1E6, Canada
e-mail: houcine.ayari@ultragen.com

D. Truong

Project Engineer
Department of Mechanical Engineering,
Ultragen Ltd.,
50 Rue de Lauzon,
Boucherville PQ J4B 1E6, Canada
e-mail: daniel.truong@ultragen.com

J. Sehn

Project Engineer
Department of Mechanical Engineering,
Ultragen Ltd.,
50 Rue de Lauzon,
Boucherville PQ J4B 1E6, Canada
e-mail: jeffrey.sehn@genesys-ind.ca

K. T. Truong

President
Mem. ASME
Department of Mechanical Engineering,
Ultragen Ltd.,
50 Rue de Lauzon,
Boucherville PQ J4B 1E6, Canada
e-mail: kt@ultragen.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 17, 2013; final manuscript received December 3, 2013; published online February 27, 2014. Assoc. Editor: Wolf Reinhardt.

J. Pressure Vessel Technol 136(3), 034502 (Feb 27, 2014) (8 pages) Paper No: PVT-13-1083; doi: 10.1115/1.4026191 History: Received May 17, 2013; Revised December 03, 2013

An internal floating roof is to be installed on an existing large API storage tank. In order to ensure the proper functionality of the roof, the deformation of the shell has been monitored and analysed. The measurements on the shell ovality show that the actual radial deformation is beyond the acceptable limit for installation of a serviceable internal floating roof and corrective actions should be taken. Consequently, a series of tests and analyses were performed to provide a recommended practice to restore the tank to its round shape.

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References

Myers, P. E., 1997, Aboveground Storage Tanks, McGraw-Hill, New York.
Marr AllenW., Ramos, J. A., and William Lambe, T., 1982, “Criteria for Settlement of Tanks,” J. Geotech. Engrg. Div., 108, pp. 1017–1039.
Malik, Z., Morton, J., and Ruiz, C., 1977, “Ovalization of Cylindrical Tanks as a Result of Foundation Settlement,” J. Strain Anal. Eng. Des., 12, pp. 339–348. [CrossRef]
Joel, L., Andreani, A., and Nick, C., 2007, “Final Report on the Study of Out-of-Plane Tank Settlement API-N004 -0 -04,” Washington, D.C, API SCAST, SCI.
American Petroleum Institute, API Standard 653, Tank Inspection, Repair, Alteration, and Reconstruction, 4th ed., 2009, addendum 2, 2012.
Koezwara, F. A., 1980, “Simple Method Calculates Tank Shell Distortion,” Hydrocarbon Processing, Vol. 08, pp. 101–104.

Figures

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Fig. 1

(a) Mechanical distortion and structure damage; (b) and (c) show the deformed areas.

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Fig. 2

(a) Reading data; (b) Settlement profile of the tank bottom

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Fig. 3

OOP Settlement evaluation according to API 653 Appendix B

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Fig. 4

Tank model on elastic foundation

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Fig. 5

Finite element model

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Fig. 7

Location of plate to be cut out

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Fig. 8

Deformation and displacement profile for tank with fixed roof

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Fig. 9

Deformation profile (OOR) for tank without fixed roof (Open Tank)

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Fig. 11

(a) Theoretical and (b) numerical OOR profile

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Fig. 13

New settlement profile and deformed shape of the tank after releveling

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Fig. 14

OOR at tank top after releveling

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