The radial second mode of sloshing in a circular cylindrical oil storage tank induces an out-of-plane deformation of the floating roof deck. The radial contraction of the deck due to this out-of-plane deformation contains modal components with circumferential wave numbers 0 and 2, thereby causing an elliptical deformation of the pontoon, which encloses the deck. In a previous paper, the stress caused by this elliptical deformation was analyzed by regarding the radial contraction of the deck as an enforced displacement of the whole pontoon. This paper presents an improved method for this stress analysis by considering the radial contraction of the deck as an enforced displacement of the joint between the deck and the pontoon. First, the effectiveness of the previous method in estimating the hoop membrane stress at the joint with the deck is confirmed by comparing the results obtained from the previous and improved method. Next, the improved method is used to predict also the other stress components in each portion of the pontoon. Numerical results reveal that the bending stresses are magnified locally near the joint with the deck and that the hoop membrane stress in the outer portion of the pontoon sensitively depends on the geometry of the cross-section of the pontoon. It is found that the hoop membrane stress near the joint between the outer rim and the top (or bottom) of the pontoon can be significantly reduced by increasing the slope of the top (or bottom) of the pontoon.
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October 2011
Research Papers
Elliptical Deformation of a Floating Roof Pontoon Due to Radial Second Mode of Sloshing (Effect of the Geometry of Pontoon Cross-Section on the Hoop Membrane Stress)
M. Utsumi,
M. Utsumi
Machine Element Department, Technical Research Laboratory,
IHI Corporation
, 1 Shinnakaharacho, Isogo-ku, Yokohama, Kanagawa Prefecture 235-8501, Japan
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K. Ishida
K. Ishida
Environment and Plants Operations,
IHI Corporation
, 1-1 Toyosu 3-chome, Koto-ku, Tokyo 135-8710, Japan
Search for other works by this author on:
M. Utsumi
Machine Element Department, Technical Research Laboratory,
IHI Corporation
, 1 Shinnakaharacho, Isogo-ku, Yokohama, Kanagawa Prefecture 235-8501, Japan
K. Ishida
Environment and Plants Operations,
IHI Corporation
, 1-1 Toyosu 3-chome, Koto-ku, Tokyo 135-8710, JapanJ. Pressure Vessel Technol. Oct 2011, 133(5): 051302 (10 pages)
Published Online: July 14, 2011
Article history
Received:
March 23, 2010
Revised:
December 20, 2010
Online:
July 14, 2011
Published:
July 14, 2011
Citation
Utsumi, M., and Ishida, K. (July 14, 2011). "Elliptical Deformation of a Floating Roof Pontoon Due to Radial Second Mode of Sloshing (Effect of the Geometry of Pontoon Cross-Section on the Hoop Membrane Stress)." ASME. J. Pressure Vessel Technol. October 2011; 133(5): 051302. https://doi.org/10.1115/1.4003462
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