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Abstract: <br /> <br /> <br /> <br /> <br /> Floating platform is construction which often used in earth mineral exploration at deepwater. This option is used because the floating platform is very efficient and economics structure type than fixed paltform that is v...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/6252 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Abstract: <br />
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Floating platform is construction which often used in earth mineral exploration at deepwater. This option is used because the floating platform is very efficient and economics structure type than fixed paltform that is very dificult to be constructed at deep sea. Floating platform consist from many parts of structure which a critical part is riser purpose to send of mineral or gas from seabed to up platform at surface of sea. Riser damage is caused of many excitation load at riser between wave loading that excitate to FPSO. Riser damage often to be caused by structure fatigue as consequence from cyclics stress that happened after dynamics load have work it. Modeling of structure is decoupled model where riser be analyzed separated with the other parts of structure. Asumption is simple structure by riser and FPSO which get harmonics loading at top of riser and gift boundary condition by displacement response FPSO to riser. The harmonics wave loading that is used in analysis is regular wave and random wave. In this thesis we study influence of wave loading to fatigue of the structure with give it many varition of frequency wave loading for the structure. So we give it many variation of wave direction for the structure. In the analysis we use two configuration of riser as comparation. That is catenary configuration and lazy wave configuration. This riser analysis is displacement response analysis that occur at the FPSO platform and many arclength riser points. Effective tension and wall tension that occur to be compared to each wave frequency variation case and wave direction variation case both the configurations. Scatter pattern of fatigue points that have damage is appeared by fatigue rose which indicated a large of damage scale by thetha direction of riser shape discritation. The last is fatigue life analysis that was occurred with calculated how far damage og length both the catenary configuration and lazywave configuration. <br />
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