OFFSHORE PLATFORM STRUCTURAL ASSESSMENT DUE TO CORROSION WITH LINEAR AND NONLINEAR ANALYSIS

• Main Author: Leonardo, Samuel
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/35324
• Institution: Institut Teknologi Bandung

Energy is always needed in human life, in which the most important is derived from oil and natural gas. The process of exploration and exploitation of oil and gas is not only done on the land, but also in the ocean, and the process of the exploration in the ocean has a higher difficulty than on the land, so it takes a complex technology. One of the technologies used is offshore platform infrastructure, where one of the types generally used in Indonesian ocean is jacket platform. Jacket platform is a type of offshore platform used in shallow and transition water. Basically, offshore platform which is already in operation has met the requirements of the design, but during the operation of offshore platform in exploring and exploitating oil and natural gas, there will be several problems on the structure, and one of the problem which generally occurs is corrosion. The occurence of corrosion on the structural elements of the offshore platform will affect the performance of the structure, so it is necessary to check the strength of the structure after the occurence of the corrosion. Through that assessment, will be known whether the offshore platform will still be able to withstand the loads that occurs in each condition, such as operational, extreme, and seismic condition. Besides of those three conditions, checking fatigue resistance of the structural elements is necessary. For the first level, linear analysis (elastic condition) of the struture will be performed, where the results of this analysis are the capability of the structural elements, joints, and pile safety factor in restraining all of the forces that occur. But, when linear checking of the structure did not conform with the requirements, then the next level of the analysis is needed, which is non-linear analysis (until it reaches both the plastic condition and collapse of the structure). Where this non-linear analysis results the Reserve Strength Ratio value (RSR), pushover curve, and the collapse pattern of the structure. In the end, the RSR value will be checked according to the code requirements, so the offshore platform structure can be considered safely withstand the loads in any conditions.