Driyastomo, Adam Rangga (2020) PENGARUH FREE SPAN TERHADAP ON-BOTTOM STABILITY PIPA BAWAH LAUT. STUDI KASUS : PIPELINE BE-BA PERTAMINA HULU MAHAKAM, LAPANGAN BEKAPAI. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
04311640000086-Undergraduate_Thesis.pdf - Accepted Version Download (7MB) | Preview |
Abstract
Sistem perpipaan bawah laut memiliki salah satu masalah yang sangat dihindarkan, ialah free span. Free span dapat menjadi sangat rentan, bahkan salah satu penyebab kerusakan struktur pada sistem perpipaan itu sendiri. Kegagalan tersebut bisa disebabkan oleh vortex induced vibration (VIV). VIV sendiri disebabkan oleh beban lingkungan yang utamanya ialah gelombang dan arus. Dalam tugas akhir ini, analisis pipeline yang mengalami free span dimulai dari stabilitas lateral dan stabilitas vertical pada pipeline itu sendiri yang mana mengacu kepada DNV RP F 109, screening criteria VIV dan screening criteria ultimate limit state, sampai dengan analisis tegangan kombinasi pada pipeline tersebut yang mengalami free span. Dalam tugas akhir ini, selain menganalisis stabilitas free span, diharapkan juga mendapatkan hasil yang sesuai tentang analisis dinamis dan ultimate limit state. Berdasarkan perhitungan-perhitungan tersebut tugas akhir ini diharapkan akan mendapatkan hasil akhir dari tegangan-tegangan, seperti tegangan hoop, tegangan longitudinal, sampai tegangan kombinasi. Hasil dari tegangan-tegangan tersebut harus sesuai dengan standart ASME B 31.8. Adapun acuan selain DNV RP F 109 dan ASME B31.8, yaitu DNV OS F 101 dan juga DNV RP F 105 dalam melakukan analisis tugas akhir ini. ==============================================================================================
Subsea Pipeline system has one problem that is very much avoided, which is free span. Free span can be very vulnerable, even one of the causes of structural damage to the pipeline system itself. This failure can be caused by vortex induced vibration (VIV). VIV itself is caused by environmental loads, mainly waves and currents. In this final project, analysis of pipelines that experience free span starts from lateral stability and vertical stability of the pipeline itself which refers to DNV RP F 109, screening criteria for VIV and screening criteria for ultimate limit state, up to the combined stress analysis on the pipeline which experience free span. In this final project, apart from analyzing the stability of the free span, it is also expected to obtain appropriate results regarding dynamic analysis and ultimate limit state. Based on these calculations, it is hoped that this final project will get the final results of stresses, such as hoop stresses, longitudinal stresses, and combined stresses. The results of these stresses must be in accordance with the ASME B 31.8 standard. As for the references besides DNV RP F 109 and ASME B31.8, namely DNV OS F 101 and also DNV RP F 105 in conducting the analysis of this final project.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Subsea Pipeline, On-Bottom Stability, Free span, Vortex Induced Vibration, VIV, |
| 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: | Adam Rangga Driyastomo |
| Date Deposited: | 20 Jun 2024 08:55 |
| Last Modified: | 20 Jun 2024 08:55 |
| URI: | http://repository.its.ac.id/id/eprint/79785 |
Actions (login required)
 |
View Item |