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Evaluation of Storage Tank Floating Roofs for Stress and Stability Due to Earthquake Induced Liquid Sloshing

[+] Author Affiliations
Philip J. Cacciatore, Benjamin F. Hantz, IV, L. Magnus Gustafsson

ExxonMobil Research & Engineering Company, Fairfax, VA

Paper No. PVP2007-26283, pp. 111-119; 9 pages
doi:10.1115/PVP2007-26283
From:
  • ASME 2007 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • San Antonio, Texas, USA, July 22–26, 2007
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4286-X | eISBN: 0-7918-3804-8
  • Copyright © 2007 by ASME

abstract

Considerable interest has developed in the engineering community concerning the damage to the floating roof of oil storage tanks due to liquid sloshing from earthquake loading. Engineering groups in countries bordering the circum-Pacific seismic belt in particular are devoting extensive efforts to obtaining solutions capable of identifying vulnerable roof designs and developing modifications to improve strength. The recent efforts of the Japanese Fire Disaster and Management Authority (FDMA) as a result of 1995 Kobe and the 2003 Tokachi-Oki earthquakes are examples of recent work in this area. This paper focuses on efforts to analyze floating roof structures for stress and stability under typical earthquake velocity spectrums using advanced finite element methods. It employs ideas included in the Japanese FDMA studies, work done as part of the ASCE Committee on Gas and Liquid Fuel Lifelines, and some original methods developed at ExxonMobil. It has been applied to several tank designs and been submitted as a suitable advance analysis method to the Japanese FDMA. The paper provides both the theoretical foundation as well as an example covering typical tank geometry.

Copyright © 2007 by ASME

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