Tie-Braces Design Optimization of Breasting Dolphin Structure at Petrochina Marine Terminal

Rudi W Prastianto, Dyah A Puspitorini, Yoyok S Hadiwidodo

Abstract


This paper discusses about optimization design of breasting dolphin’s structural strengthening with additional tie-bra­ces. The breasting dolphin structure has failed because of the increased load on the export activity of tanker. A strengthe­ning project has been carried out in 2014, but the result is considered overdesign and is not optimal. There­fore an optimization design of breasting dolphin structure is carried out as described herein, by looking for the optimum configuration, outside diameter, and wall thickness. The objective function is to determine the minimum weight of the structure. The independent variables are the outside diameter and wall thickness. The constraints are joint deflection check, member stress check, and joint punching shear stress check. There two type analyses performed. Firstly, in-place analysis of several structures with various tie-braces dimensions. The calcu­lation of the initial tie-braces dimension was performed using parameter’s design according to API RP 2A WSD. Secondly is optimization analysis of output data from the in-place evaluation to determine optimum outside diameter and wall thickness of tie-braces, also the weight of the structure. After optimization analysis conducted it is found optimum structural weight be 261 tons, which is some 3 tons lighter than the previous one of 264 tons.

Keywords


optimization; breasting dolphin; tie-braces; independent variable; constraint

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References


T026-ZR-2001: In-place analysis for dolphin platform. Project Report, PT Encona Ini Industri. Jakarta, 2014

Triatmodjo, B.: Port Design. Beta Offset. Yogyakarta, 2009 (in Indonesian)

Rosyid, D.M.: Optimization: Quantitative Approach in Decision Making Technique. Department of Ocean Engineering, ITS, Surabaya, 2009 (in Indonesian)

Chakrabarti, S.K.: Handbook of Offshore Engineering. Elsevier, Oxford, 2005

API: Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platform-Working Stress Design, API Recommended Practice 2A (API RP2A WSD). American Petroleum Institute, Washington, DC, 2010

API: Specification for Line Pipe (API 5L). American Petroleum Institute, Washington, DC, 2004

Nuriman, F., Handayanu, and Prastianto, R.W.: Pushover analysis on deck extension of HZEB wellhead tripod jacket platform due to extreme environmental load. National Seminar on Theory and Applied Marine Technology (SENTA 2012), Surabaya, Indonesia (in Indonesian)

Anggoronadhi, D., Prastianto, R.W., and Handayanu: Stress analysis on skirt pile due to operational and extreme loads. National Seminar on Theory and Applied Marine Technology (SENTA 2012), Surabaya, Indonesia (in Indonesian)




DOI: http://dx.doi.org/10.12962/j2580-0914.v1i1.2868

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