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Abstrak :
Eksplorasi minyak dan gas pada laut dalam membutuhkan struktur bangunan lepas pantai yang memiliki kelebihan dari segi kemudahan, stabilitas, serta fleksibilitas di dalam proses pengeboran, produksi, maupun penyimpanan hasil produksi migas. Struktur Truss SPAR (Single Point Anchor Reservoir) dilengkapi dengan komponen heave plate dan sistem rangka mampu mengatasi masalah stabilitas gerakan vertikal akibat gelombang laut yang memiliki periode getar alami vertikal sebesar 22 ? 30 detik yang berada di atas periode gelombang rata-rata Teluk Meksiko. Struktur heave plate dimodelkan dengan ABAQUS 3D Elemen Hingga untuk meninjau lendutan vertikal dan stabilitas pelat baja terhadap beban percepatan gelombang vertikal (added mass fluid T=15.8 detik) di kawasan Teluk Meksiko. Lendutan positif maksimum pada bagian tengah pelat sebesar 1.5 meter saat waktu pembebanan t=3.088 detik dan lendutan negatif maksimum 1.098 meter saat t= 9.754 detik. Tegangan aksial tekan maksimum terjadi pada bagian tengah pelat, bagian tengah sisi kantilever pelat, dan bagian sisi kantilever pelat di daerah tumpuan sebesar 398.37 MPa, 400 MPa, dan 393.98 MPa. Kegagalan tekuk pelat struktur heave plate dicek berdasarkan Standar DNV-RP-C201. ...... Oil and gas exploration in deep waters need offshore structure which have advantages in terms of convenience, stability, and flexibility in process of drilling, production, and storage platform. Truss Spar Platform equipped by frame system and heave plate have overcomes the problem of stability vertical movement by increasing the natural period in range of 22 ? 30 seconds above the Gulf of Mexico average wave period. Heave plate structure is modeled with 3D ABAQUS Finite Element Program to analyze the vertical deflection and stability of plate component towards vertical acceleration wave load (T = 15.8 seconds) in the Gulf of Mexico. The maximum positive deflection in the middle of the plate is 1.5 meters at t = 3.088 seconds in forced vibration and the maximum negative deflection is 1,098 meters at t = 9.754 seconds in forced vibration. Maximum compression axial stress occurs in the middle of plate, the central part of cantilever plate, and the side of cantilever plate are 398.37 MPa, 400 MPa and 393.98 MPa. Plate buckling stability of heave plate structure was checked by DNV-RP-C201 Standard.

Abstrak :
[Salah satu cara untuk mengekspansi penggunaan Energi Panas Bumi secara bersih dan meminimalisir dampak negatif terhadap lingkungan dengan memaksimalkan pemanfaatan sumber daya alam yang tersedia. Membuka kemungkinan lain dari penggunaan konstruksi Bangunan Lepas Pantai sebagai Pembangkit Listrik Tenaga Panas Bumi Terintegrasi. Dengan konstruksi berbasis pada Truss Spar Platform, Pembangkit Listrik Tenaga Panas Bumi Lepas Pantai ini berlokasi di Gunung Laut Kawio Barat, Perairan Sangihe Talaud, Sulawesi Utara, Indonesia. Platform yang memiliki Displacement sebesar 201556 DWT menggunakan 12 Mooring Lines, dengan sistem pertambatan Taut dan kalibrasi chain-polyester-chain. Chain dengan Grade 4 (K4 Studless Chain) berdiameter 5” dan Polyester High-Tech Fibre Ropes berdiameter 11”. Didapatkan hasil Gravity Loads sebesar 201556 N, Resistant Loads 3715.9 N, Current Drag 321448.04, Lift Force 1125068.16 N, Steady and Dynamic Wind Loads on Structures 457520.05 N, Impulse Load (Wave Slamming Load 6.23 N. ......Breaking Wave Loads 873.84 N; Wave Run-Up Loads 0.766 N). Analisis RAO (Response Amplitude Operator) terhadap struktur terlampir dalam bentuk grafik. Konversi Energi pada Power Plant dengan siklus Rankine, memiliki kalibrasi 2 set turbine untuk menghasilkan power sebesar 80MW, dengan efisiensi thermal sistem sebesar 60%. Dan Mooring Tension yang terjadi di setiap Mooring Lines masih memiliki nilai yang berada dibawah Allowable Tension, sehingga desain Mooring Lines aman untuk digunakan pada Platform. ......One way to expand the use of geothermal energy which clean and minimalizing the negative impacts to the environments by the maximizing the utilization of available resources. Open up another possibility of using the Offshore Constructions for an Integrated Offshore Geothermal Power Plant. With constructions based on Truss Spar Platform, the Offshore Geothermal Power Plant 8 x 80 MW are located in Kawio Barat Seamount, Sangihe Talaud Seas, North Sulawesi, Indonesia. The platform which has the displacement is about 201556 DWT are using the 12 Mooring Lines, with Taut Mooring System and calibrations are chain-polyester-chain. The chain is Grade 4 (K4 Studless Chain) with diameter 5” and Polyester High-Tech Fibre Ropes with diameter 11”. The calculation resulted are 201556 N for Gravity Loads, 3715.9 N for Resistant Loads, 321448.04 for Current Drag, 1125068.16 N for Lift Force, 457520.05 N for Steady and Dynamic Wind Loads on Structures, Impulse Load (Wave Slamming Load 6.23; Breaking Wave Loads 873.84 N; Wave Run-Up Loads 0.766 N). RAO (Response Amplitude Operator) analysis concerning to the structure are proven in graph. Energy Conversion in Power Plant with Rankine cycle, have 2 sets of turbine calibrations to produce 80MW of power, with the thermal efficiency is 60%. And Mooring Tension that occurs in each Mooring Lines are still in the under of Allowable Tension, so that the Mooring Lines Design are safe to be used on the Platform., One way to expand the use of geothermal energy which clean and minimalizing the negative impacts to the environments by the maximizing the utilization of available resources. Open up another possibility of using the Offshore Constructions for an Integrated Offshore Geothermal Power Plant. With constructions based on Truss Spar Platform, the Offshore Geothermal Power Plant 8 x 80 MW are located in Kawio Barat Seamount, Sangihe Talaud Seas, North Sulawesi, Indonesia. The platform which has the displacement is about 201556 DWT are using the 12 Mooring Lines, with Taut Mooring System and calibrations are chain-polyester-chain. The chain is Grade 4 (K4 Studless Chain) with diameter 5” and Polyester High-Tech Fibre Ropes with diameter 11”. The calculation resulted are 201556 N for Gravity Loads, 3715.9 N for Resistant Loads, 321448.04 for Current Drag, 1125068.16 N for Lift Force, 457520.05 N for Steady and Dynamic Wind Loads on Structures, Impulse Load (Wave Slamming Load 6.23; Breaking Wave Loads 873.84 N; Wave Run-Up Loads 0.766 N). RAO (Response Amplitude Operator) analysis concerning to the structure are proven in graph. Energy Conversion in Power Plant with Rankine cycle, have 2 sets of turbine calibrations to produce 80MW of power, with the thermal efficiency is 60%. And Mooring Tension that occurs in each Mooring Lines are still in the under of Allowable Tension, so that the Mooring Lines Design are safe to be used on the Platform.]