The study of the crack apparition and propagation on a 60 cubic meters steel tank

  • Matei Cosmin Baciu “Dunarea de Jos” University of Galati
  • Bogdan Ioan Bahrim “Dunarea de Jos” University of Galati
  • Cristina Birladeanu “Dunarea de Jos” University of Galati
  • Cristina Serea “Dunarea de Jos” University of Galati
  • Costel Iulian Mocanu “Dunarea de Jos” University of Galati
Keywords: tank, crack, air pressure, FEM analysis, Cosmos, Femap.

Abstract

International Association Of Classification societies inspect every year all safety systems from the LNG/LPG ships, regarding the storage tanks. The cargo in the tanks of gas carrier is partially liquid and partially vapour in normal condition. However, when the tank structure collapses, the vapour tries to escape or leak through the opening, resulting in decreasing the pressure inside the tank. These drastic lowering of pressure inside the cargo tank results in rapid boiling of liquid and increase in vapour formation. The pressure of the escaping vapour becomes very high and leads to a shock wave or explosion in presence of a fire source, completely destroying the tanks structure and surrounding areas. This matter determined the beginning of the study about the cracks that appear on a tank that is 10 meters long, has 3 meters in diameter and is made of steel plates with a 45 millimetres thickness.

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References

[1]. https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2012-04/Oss-103.pdf.
[2]. Code for Existing Ships Carrying Liquefied Gases in Bulk, IMO Publishing, 1976.
[3]. http://www.imo.org/en/OurWork/Environment/PollutionPrevention/
ChemicalPollution/Pages/IGCCode.aspx.
[4]. http://www.marineinsight.com/tech/what-isboiling-liquid-expanding-vapour-explosionbleve-on-gas-carrier-ships/
[5]. A.M. Birk and M.H. Cunningham: “Liquid Temperature Stratification and Its Effect on BLEVEs and Their Hazards, J. Hazard. Mater., 48, pp. 219–37, 1996.
Published
2017-12-31
How to Cite
1.
Baciu MC, Bahrim BI, Birladeanu C, Serea C, Mocanu CI. The study of the crack apparition and propagation on a 60 cubic meters steel tank. Annals of ”Dunarea de Jos” University of Galati. Fascicle XI Shipbuilding [Internet]. 31Dec.2017 [cited 29Mar.2024];39:47-0. Available from: https://www.gup.ugal.ro/ugaljournals/index.php/fanship/article/view/1099
Section
Articles

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