Research Papers: Design and Analysis

Stability of Open Top Cylindrical Steel Storage Tanks: Design of Top Wind Girder

[+] Author and Article Information
E. Azzuni

Lyles School of Civil Engineering,
Purdue University,
West Lafayette, IN 47907
e-mail: eazzuni@purdue.edu

S. Guzey

Lyles School of Civil Engineering,
Purdue University,
West Lafayette, IN 47907
e-mail: guzey@purdue.edu

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 1, 2016; final manuscript received December 13, 2016; published online January 31, 2017. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 139(3), 031207 (Jan 31, 2017) (11 pages) Paper No: PVT-16-1127; doi: 10.1115/1.4035507 History: Received August 01, 2016; Revised December 13, 2016

Design of the top wind stiffeners of aboveground storage tanks designed to the requirements of API 650 is investigated. The current design methodology is based on intuition and experience without a sound technical justification. This paper investigates a diameter limit to be used in the design of the top stiffener ring by using finite-element analysis (FEA) in a parametric study. Linear bifurcation analysis (LBA) and geometrically nonlinear analysis including imperfections (GNIA) were performed on cylindrical storage tanks. By modeling tanks with different diameters and limiting the design of top stiffener ring for a diameter of 170-ft (52-m), the buckling loads are investigated. It was found that the 170-ft (52-m) diameter is a suitable upper limit to design the top stiffener rings for larger diameters.

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Fig. 1

Local and general buckling cases for shell subjected to uniform external pressure and to wind load

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Fig. 2

Number of lobes for failure mode of tank of t/D and L/D ratios

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Fig. 3

Evolution of the buckling spacing expression of cylindrical tanks under external uniform and wind pressures

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Fig. 4

Evolution of the section modulus requirements throughout the years

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Fig. 5

Roark's ring case 8 and case 20 combined

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Fig. 6

Different wind profile patterns

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Fig. 7

Actual load path; shear is concentrated symmetrically in two locations only

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Fig. 8

Cross section of ring stiffener detail (e) as per API 650[1]

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Fig. 9

Wind profile as suggested by Rish [16]

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Fig. 10

Schematic elevation view of a tank with two intermediate stiffener rings

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Fig. 11

Tank with top stiffener ring only

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Fig. 12

Tank with top stiffener ring and two intermediate stiffener rings

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Fig. 13

GNIA results for wind speed of 90-mph (140-km/h), equivalent pressure is 0.07-psi (483-Pa)

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Fig. 14

GNIA results for wind speed of 150-mph (230-km/h), equivalent pressure is 0.195-psi (1346-Pa)




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