FPSO global strength and hull optimization

Abstract

Global strength is a significant item for floating production storage and offloading (FPSO) design, and steel weight plays an important role in the building costs of FPSO. It is the main task to consider and combine these two aspects by optimizing hull dimensions. There are many optional methods for the global strength analysis. A common method is to use the ABS FPSO Eagle software to analyze the global strength including the rule check and direct strength analysis. And the same method can be adopted for the FPSO hull optimization by changing the depth. After calculation and optimization, the results are compared and analyzed. The results can be used as a reference for the future design or quotation purpose.

Keywords

global strength / hull optimization / FPSO / steel weight / building costs / hull strength / ship design / hull design

References

[1] ABS Rules for building and classing floating production installations, 2013

[2] ABS Guide for the fatigue assessment of offshore structures, 2009

[3] ABS Guide for buckling and ultimate strength assessment for offshore structures, 2012

[4] BV Rules for the classification of offshore units, 2013

[5] Chakarov K, Garbatov Y, Guedes Soares C. Fatigue analysis of ship deck structure accounting for imperfections. International Journal of Fatigue, 2008, 30(10–11): 1881-1897

[6] Deng X-f, Li X, Zhang T, Chen D, Huang Q. Global performance snalysis for FPSO in shallow water. Shipbuilding of China, 2009, 50(A11): 192-198

[7] DNV Design of offshore steel structures, general(LRFD Method), 2011

[8] Ferro G, Cervetto Soares C. Hull girder reliability. Proceedings of the Ship Structural Symposium, 1984, 89-110

[9] Hu Y, Chen B. Fatigue reliability analysis of the ship and ocean engineering strucures, 1996, Beijing: China Communication Press, 127-146

[10] IMO(2004). MARPOL 73/78. International Maritime Organization.

[11] IMO(2005). Load Lines. International Maritime Organization.

[12] IMO Code for The Construction And Equipment of Mobile Offshore Drilling Units, 2009

[13] IMO International code on intact stability, 2008

[14] Miner MA. Cumulative damage in fatigue. Journal of Applied Mechanics-Transactions of the ASME, 1945, 12(3): A159-A164

[15] Molin B, Remy F, Rigaud S, de Jouette Ch. LNG-FPSO’s: frequency domain, coupled analysis of support and liquid cargo motions. IMAM, 2002

[16] Paik JK, Kim BJ, Seo JK. Methods for ultimate limit state assessment of ships and ship-shaped offshore structures. Ocean Engineering, 2008, 35: 261-270

[17] Rognebakke OF, Faltinsen O. Effect of sloshing on ship motions. 17th Int. Workship on Water Waves and Floating Bodies, Hiroshima, Japan, 2001

[18] Zhao G. FPSO design. Shanghai Shipbuilding, 2002, 4-8

[19] Zhao G. On the design features of FPSO structures. Ship & Boat, 2002, 38-41