Wicaksono, Andree Yudi (2018) Analisis Stabilitas Pipa "Flowline" Fleksibel Bawah Laut: Studi Kasus Platform A Menuju Platform B PT. X. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
4311440000038-Undergraduate_Theses.pdf - Accepted Version Download (8MB) | Preview |
Abstract
Pada transportasi hasil minyak dan gas, pipa bawah laut adalah salah satu moda yang banyak digunakan. Pada penggunaan pipa bawah laut stabilitas menjadi hal yang harus diperhatikan. Stabilitas pipa bawah laut sangat diperlukan baik saat kondisi instalasi maupun kondisi operasi. Pipa bawah laut yang digunakan harus mampu menahan beban lingkungan terutama gelombang dan arus laut. Pada tugas akhir dilakukan analisis stabilitas pipa fleksibel bawah laut berdarkan DNV RP F109 tentang “On-Bottom Stability Design of Submarine Pipelines”. Analisis yang dilakukan meliputi analisis Stabilitas Lateral dan Stabilitas Vertikal. Berdasarkan analisis stabilitas, pipa bawah laut dapat dikatakan stabil apabila memiliki nilai factor keamanan kurang dari atau sama dengan 1, baik stabilitas vertikal maupun lateral. Selain itu pipa bawah laut dikatakan stabil apabila pergerakan lateralnya kurang dari 0.5 kali diameter untuk zona 2, dan 10 kali diameter untuk zona 1 sesuai dengan DNV RP F109. Besar gaya hidrodinamis arah horizontal pada kondisi instalasi adalah 4,77 N/m dan pada kondisi operasi adalah 23,31 N/m. Besar gaya hidrodinamis vertikal pada kondisi instalasi adalah 4,39 N/m dan pada kondisi operasi adalah 35,06 N/m. Hasil analisis stabilitas pipa menunjukkan bahwa dengan konfigurasi pemberat dengan jarak 10 meter dan massa concrete weight 663 kg pada tiap titiknya, memiliki kriteria desain vertikal 0,328 dan kriteria desain lateral 0,076. Dari hasil simulasi dinamis menggunakan OrcaFlex didapatkan nilai pergerakan lateral maksimum 32mm pada zona 1 dan 33,4mm pada zona 2. Sesuai DNV RP F109 konfigurasi ini memenuhi kriteria stabilitas dan pipa dapat dikatakan stabil.
===========================================================================================================
In oil and gas transportation, offshore pipelines are one of the most widely used modes. On the use of offshore pipeline, stability becomes a thing to be considered. Offshore pipeline stability is necessary both during installation and operating conditions. Offshore pipeline must be able to withstand environmental loads, especially waves and ocean currents. In this final project, offshore flexible pipeline stability analysis undertaken under DNV RP F109 “On-Bottom Stability Design of Submarine Pipelines". The analyzes include Vertical Stability and Lateral Stability Analysis. Based on the stability analysis, the offshore pipeline can be said to be stable if it has a safety factor value of less than or equal to 1, both in vertical and lateral stability. In addition, subsea pipes are said to be stable if their lateral movement is less than 0.5 times the diameter for zone 2, and 10 times the diameter for zone 1 corresponds to DNV RP F109. Hydrodynamic force horizontal direction at installation condition is 4.77 N / m and at operating condition is 23.31 N / m. The vertical hydrodynamic force under installation conditions is 4.39 N / m and under operating conditions is 33.06 N / m. The results of pipe stability analysis showed that with the ballast configuration with a distance of 10 meters and mass concrete weight of 663 kg at each point, has a vertical design criterion of 0.328 and a lateral design criterion of 0.076. From the dynamic simulation result using OrcaFlex obtained the maximum 32mm lateral movement value at zone 1 and 33.4mm in zone 2. As per DNV RP F109 this configuration fulfill stability criteria and pipe can be said stable.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 621.867 2 Wic a-1 3100018078720 |
| Uncontrolled Keywords: | DNV OS F101, DNV RP F109, Stabilitas Pipa, Pipa Fleksibel, |
| 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: | Wicaksono Andree Yudi |
| Date Deposited: | 06 Dec 2020 07:50 |
| Last Modified: | 25 Feb 2021 05:29 |
| URI: | http://repository.its.ac.id/id/eprint/53666 |
Actions (login required)
 |
View Item |