Erestio, Rizal Cesarian (2016) Analisis Kekuatan dan Sensitivitas Steel Catenary Riser akibat Pergerakan Semi-Submersible. Undergraduate thesis, Institut Teknology Sepuluh Nopember.
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Abstract
Kondisi perairan laut dalam membuat para pelaku industri migas dihapadi pada tantangan-tantangan baru, sehingga banyak dilakukan studi pengembangan teknologi laut dalam, salah satunya adalah teknologi riser. Riser merupakan komponen penting dalam mentrasportasi minyak dan gas dari fasilitas subsea menuju floater. Riset-riset menunjukkan bahwa riser yang sesuai untuk laut dalam salah satunya adalah jenis Steel Catenary Riser (SCR). Namum, terdapat daerah-daerah penting yang harus diperhatikan pada SCR yaitu hang-off location, sagbend dan touchdown point. Tinjauan khusus dari tugas akhir ini bertujuan untuk menganalisis kekuatan SCR terhadap pergerakan dinamis semi-submersible. Analisis ini dilakukan dengan model matematis kombinasi beban fungsional dan lingkungan dalam simulasi domain waktu. Hasil effective tension terbesar untuk kondisi ULS adalah 302.831 kN dari arah pembebanan 900, sedangkan bending moment terbesar berasal dari arah pembebanan 450 dengan nilai mencapai 2624.546 kN.m. Tegangan von mises maksimum terdapat pada daerah sagbend, sehingga kekuatan SCR pada daerah tersebut harus ditinjau lebih lanjut. Kekuatan SCR ditinjau menggunakan metode LRFD yang terdapat pada DNV OS F201. Selain itu dilakukan juga analisis sensitivitas SCR terhadap perubahan offset untuk mengetahui reaksi SCR terhadap perubahan parameter tersebut. Hasil menunjukkan bahwa perubahan offset mempengaruhi konfigurasi, effective tension dan bending moment secara signifikan.
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The condition of deepwater makes the oil and gas industry faced with new challenges, leads to studies about deepwater technology development, one of them is riser technology. Riser is an important component to transport oil or gas from subsea facility to topside facility. Several studies suggests that one type of riser that suitable for deepwater is Steel Catenary Riser (SCR). Still, there are some critical areas that must be considered specifically, hang-off location, sagbend and touchdown point. The main idea of this final project is to analyse the strength of SCR due to the dynamic motion of a semi-submersible. The analysis is performed by mathematical model with combinations of functional and environmental load within time domain simulation. The biggest effective tension for ULS condition is 302.831 kN from 900 wave direction, while the biggest bending moment is from 450 wave direction, with a value of 2624.546 kN.m. Maximum von mises stress occured at sagbend area, therefore the strength of SCR in those areas should be checked. The strength is checked with LRFD method which based on DNV OS F201. Furthermore, sensitivity analysis is performed against floater offset to show how it affects the riser response. The result suggests that the change of offset affects riser configuration, effective tension and bending moment significantly
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 627.48 Ere a |
| Uncontrolled Keywords: | analisis kekuatan, semi-submersible, steel catenary riser, ULS |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 07 Jan 2020 02:32 |
| Last Modified: | 07 Jan 2020 02:32 |
| URI: | http://repository.its.ac.id/id/eprint/72565 |
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