Volume 12, Number 23 (9-2016) | 2016, 12(23): 115-121 | Back to browse issues page


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zakeri A, shanehsazzadeh A. The effect of optimum launching on the reduction of offshore jacket weight. International Journal of Maritime Technology. 2016; 12 (23) :115-121
URL: http://ijmt.ir/article-1-348-en.html

1- University of Isahan
2- Assistant Professor University of Isfahan
Abstract:   (903 Views)

Launching method is commonly applied for installation of heavy template (jacket) platforms. One of the important phases in design and construction of offshore platforms is launching condition. This will insure the safty of the procedure and will optimize the weight of the related members of the jacket. In this article, effective factors and amount of forces that applied on steel jacket during launching and the minimum distance of jacket to sea bed are studied through a parametric analysis. For simulation of the launching procedure the technical softwate of SACS is applied. The analyses are applied on two jackets installed in Persian Gulf. The initial tilting angle, draft, and bouyancy are among the parameters which are studied. The results of the study show that the tilting angle and bouyancy are the most effective parameters which reduce the launching forces up to 20%.  The study shows that optimizing the procedure of launching in the case of the jackets of the present study can reduce the weight up to 4 percent. 

Full-Text [PDF 785 kb]   (219 Downloads)    
Type of Study: Technical Note | Subject: Marine Structures and near shore
Received: 2014/08/22 | Accepted: 2016/10/30

References
1. Jo, C. H., Kim, K. S., Lee, S. (2002), Parametric study on offshore jacket launching, Ocean engineering, vol. 29, pp. 1959-1979.
2. Honarvar, M., Pirooz, M. D., Bahaari, M. R., (2008), A Physical and Numerical Modeling for Launching of Jackets (Case Study on Balal PLQ Platform), Journal of offshore mechanics and Arctic engineering, vol. 130,pp.101-109.
3. Bhattacharyya S., Idichandy V. (1985). On experimental investigation of load-out, launching and upending of offshore steel jackets. Applied Ocean Research, vol. 7, pp. 24-34.
4. American Petroleum Institute (API), (2000) Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms–Working Stress Design, 21th Edition.
5. Resnick R., Halliday D., Kenneth K. S, (1992) Physics. Vol.1:Wiley.
6. SACS. 5.1, User Manual, Release 5, Revision 4.
7. Zakeri, A. (2013), Analysis of offshore jacket launching, MSc thesis, university of Isfhan. (In Persian).
8. Zakeri, A., Shanehsazzadeh, A (2013), Study on effective parameters on launching to optimize offshore jackets, 15th Conference on Marine Industry, Kish, Iran (In Persian).

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