Design and Lifting Analysis for Offshore Platform with Braced Monopod Type at The Java Sea
Nindya Aristia Pratiwi dan Ricky Lukman Tawekal
Program Studi Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung
Jl. Ganesha No.10 Bandung 40132
nindya.aristia@students.itb.ac.id dan ricky@ocean.itb.ac.id
Abstract
The need for oil and gas is increasing from time to time so it needs to be supported by facilities for exploration and exploitation of that resource. The example of facility that is usually used for exploration and exploitation is a fixed offshore platform. In order to perform its function, the structure need to be designed based on design standard that is usually used in oil and gas industry. The design standard that is used on this study is API RP2A – WSD. There are analyzes that is required to be performed at design process based on API RP2A – WSD.
As for instance are in-place analysis, seismic analysis, and fatigue analysis. Stress at member, stress at joint, pile’s capacity, and also deflection need to be checked when perform the in-place analysis. Then the results of seismic analysis are natural period of structure, member’s stress, joint’s stress, and pile’s capacity. And the result from fatigue analysis is fatigue life of joint at the structure that is affected by cyclic loading. Braced monopod structure that is designed in this thesis has meet the design standard based on API RP2A – WSD. After that, the process is continued to analyze the installation of structure. Installation method that will be discussed is lifting method with crane for topside of braced monopod. The aim of perform a lifting analysis is to determine the coordinate of hook point and also choose the rigging component like sling rope, shackle, and padeye design for lifting the topside of structure. The rigging component that is selected in this thesis has meet the standard based on API RP2A – WSD so it can be used for lifting the topside of braced monopod.
Key words: braced monopod, fatigue, in-place, lifting, seismic.
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