Determination of Environmental Load Factor for Three-Legged Flare Jacket Offshore Platform in the Northern Water of Madura Using Reliability Analysis Method
Don Revo Refaldiano 1 dan Prof. Dr. Ir. Ricky Lukman Tawekal, MSE, Ph.D. 2
Program Studi Sarjana Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung
Jalan Ganesha 10 Bandung 40312
donrefaldiano@student.itb.ac.id 1 dan ricky@ocean.itb.ac.id 2
Abstract: The environmental load factor in the ISO 19902 needs to be calibrated in advance, regarding the calibrated value in ISO 19902 are only for Gulf of Mexico, North Sea, and Australia that differ in environmental condition to the Indonesian Waters. The objective in this research is to calibrate the environmental load factor that suits the three-legged jacket flare structure in the Northern Water of Madura – one of the oil and gas offshore fields in Indonesia. Variables considered as random variables are wave height, current velocity, yield strength, modulus of elasticity, and correction factor, while for wind velocity is considered as deterministic through the sensitivity analysis. Furthermore, the structure load is modelled as a function of wave height and current velocity for the reliability analysis. Through the reliability analysis, the reliability index for the API RP 2AWSD design is 2.34. This reliability index of 2.34 then is used for the reliability index target in the determination of environmental load factor.
Keywords: environmental load factor, reliability, reliability index, FORM II, flare structure, three-legged jacket
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