Kautsar, Robbi Yahya Giri (2022) Analisis Operabilitas Instalasi Topside Dengan Variasi Pretension Mooring Lines Tipe Catenary Spread Mooring System Pada Heavy-Lift Vessel (Hlv) Studi Kasus: Zawtika Whp-12 Dl Gulf Of Mottama. Other thesis, Institut Teknologi Sepuluh Nopember Surabaya.
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Abstract
Operasi instalasi topside merupakan salab satu offshore operation yang mebutuhkan tingkat akurasi yang tinggi. Agar topside dapat terinstall, topside leg harus dapat menumpu tepat pada jacket leg. Dalam studi ini, instalasi topside dilakukan dengan metode lifting dengan Heavy-Lift Vessel (HLV). Untuk menjaga gerakan HLV pada koordinat operasinya (positioning) maka diperlukan suatu sistem tambat. Sistem tambat yang digunakan dalam studi ini adalab konfigurasi 4 x 2 dengan sudut sebar 30" -45". Gerakan topside sangat dipengaruhi oleh gerakan HLV, sebagai efek coupled multi-body system dynamic. DAF (Dynamic Amplification Factor) yang digunakan dalam industri hanya mampu mengkompensasi beban dinamik, sedangkan pada fase instalasi topside gerakan topside perlu ditinjau, oleh karena itu perlu dilakukan analisis dinamis berbasis time domain simulation. Untuk meningkatkan peforma positioning HL V pada saat instalasi topside, dalam studi ini dilakukan analisis dinamis dengan variasi besarnya pretension yaitu sebesar 30 MT, 45 MT, 60 MT, 75 MT dan 90 MT. Dari hasil analisis peningkatan besarnya pre-tension pada mooring system akan meningkatkan operability dengan rincian sebagai berikut 30 MT (Not Operable), 45 MT (32,56 %), 60 MT dan 75 MT (54,07 %), dan 90 MT (65,76%). Peningkatan pre-tension juga akan meningkatkan allowable seastate sebesar 10,78 % (Pengaturan pretension dari 45 MT menjadi 60 MT) dan 20,58 % (Pengaturan pretension dari 45 MT menjadi 90 T)
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Topside installation operation is one of the offshore operations that requires a high level of accuracy. ln order for the topside to be installed, the topside leg must be able to fit properly into the jacket leg. ln this study, the topside installation was carried out using the lifting method using the Heavy-Lift Vessel (HLV). To keep the HLV movement in its operating coordinates (positioning), a mooring system is needed. The mooring system used in this study is a 4 x 2 configuration with a scattering angle of 30°-45°. The topside movement is strongly influenced by the HLV movement, as a coupled multi-body effect. DAF (Dynamic Amplification Factor) used in industry is only able to compensate for dynamic loads, while in the topside installation phase the topside movement needs to be reviewed, therefore it is necessary to do a dynamic analysis based on time domain simulation. To improve the HLV positioning performance during topside installation, in this study a dynamic analysis was carried out with variations in the amount of pretension, namely 30 MT, 45 MT, 60 MT, 75 MT and 90 MT. From the analysis results, increasing the amount of pre-tension on the mooring system will increase operability with the following details 30 MT (Not Operable), 45 MT (32.56 %), 60 MT and 75 MT (54.07 %), and 90 MT ( 65.76%). The increase in pretension will also increase the allowable sea state by I 0. 78% (Pretension setting from 45 MT to 60 MT) and 20.58% (Pretension setting from 45 MT to 90 T)
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSKe 627.98 Kau a-1 2022 |
| Uncontrolled Keywords: | topside installation, mooring system pre-tension, operabiliy, allowable seastate |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures V Naval Science > VK > VK361 Mooring of ships. Dry docks |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | EKO BUDI RAHARJO |
| Date Deposited: | 16 Jan 2023 01:40 |
| Last Modified: | 16 Jan 2023 01:40 |
| URI: | http://repository.its.ac.id/id/eprint/95398 |
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