Permata, Yosua Niko Putra (2018) Kajian dan Perancangan Gas Pipeline untuk Laut Dalam dengan Metode J-Lay ditinjau dari Kondisi Instalasi dan Operasional. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Banyak aspek yang harus diperhitungkan dalam mendesain pipa bawah laut. Biasanya load case dominan yang terjadi pada pipa adalah dari tekanan internalnya. Seiring berjalannya waktu pipa mulai diinstalasi pada laut dalam. Semakin dalam laut, semakin tinggi pula tekanan hidrostatiknya. Tingginya tekanan hidrostatik ini menggeser dominasi tekanan internal sebagai acuan utama dalam mendesain pipa. Dalam mendesain deepwater pipeline, kondisi yang harus diperhitungkan adalah saat pipa operasional dan instalasi. Saat kondisi operasional, pipa dihadapkan dengan data lingkungan 100 tahunan yang terjadi pada lokasi dan kedalaman tersebut. Pipa yang didesain pada kondisi operasional juga belum tentu tahan saat diinstalasi akibat dari beban kombinasi antara bending, axial, dan tekanan eksternal yang terjadi terutama pada area sagbend dan overbend. Pada tugas akhir ini, pipa 14” akan didesain pada kedalaman 1426 m di Selat Makasar menggunakan code DNV-OS-F101 for Submarine Pipeline System. Pipeline akan dimodelkan menggunakan software OrcaFlex dengan kondisi operasional, instalasi dalam keadaan kosong, dan instalasi water filled. Instalasi water filled diharapkan dapat mengurangi tekanan hidrostatik yang terjadi pada pipa, sehingga tebal pipa yang dibutuhkan dapat berkurang dan lebih ekonomis. Metode instalasi yang digunakan dalam permodelan adalah J-Lay. Diakhir Penelitian, didapatkan tebal pipa yang dibuthkan pada kondisi operasional, instalasi dan water filled adalah 22.2 mm, 28.4 mm, dan 25.4 mm. Didapatkan pula tegangan yang terjadi sepanjang pipa pada kondisi – kondisi tersebut.
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There are many aspect that must be calculated in designing a subsea pipeline system. Usually the dominant load case that the pipeline must endure is from their internal pressure. Along the time, pipelines are installed in deeper water. The deeper the pipeline installed, the higher the hydrostatic pressure. The high hydrostatic pressure replace the internal pressure dominance as the main value in designing pipelines. The conditions that must be analysed in designing deep water pipelines are the operational and the installation condition. Pipelines that are designed at the operational condition not necessarily safe when installed in deepwater, because of the combined load that consist of bending moment, axial force, and also the hydrostatic pressure, especially on the overbend and sagbend area. In this final project, a 14” pipeline will be designed on 1426 m below the surface at the Makasar Strait using DNV-OS-F101 for Submarine Pipeline System code. Pipeline will be modelled using the Orcaflex software. The condition that will be analysed are the operational condition, empty pipe installation, and partially water filled installation. The water filled installation is expected to reduce the hydrostatic pressure that the pipeline must endure, along with that the wall thickness will also reduced. J-lay method will be used in this final assignment. The result from this analysis are the thickness that is needed for the pipeline. at the operational condition, the pipeline needed 22.2 mm, for the empty pipe installation, the pipeline needed 28.4 mm, for the water filled installation, the pipeline needed 25.4 mm. The stress along the pipeline will also be obtained for each condition from this analysis.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 621.867 2 Per k-1 3100018078714 |
| Uncontrolled Keywords: | Kata Kunci- deepwater pipeline, instalasi, operasional, tekanan hidrostatik, wall thickness |
| Subjects: | L Education > LB Theory and practice of education Q Science |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Yosua Niko Putra Permata |
| Date Deposited: | 02 Jan 2019 02:58 |
| Last Modified: | 16 Oct 2020 03:37 |
| URI: | http://repository.its.ac.id/id/eprint/53447 |
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