Analisis On-Bottom Stability: Studi Kasus Infield Flowline dari Platform MMF menuju Platform LPRO

Danendra, Reyhan Pahlevi (2018) Analisis On-Bottom Stability: Studi Kasus Infield Flowline dari Platform MMF menuju Platform LPRO. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisis stabilitas pada pipa bawah laut perlu dilakukan untuk mengetahui stabilitas pipa bawah laut terutama saat kondisi operasi dimana pipa bawah laut terkena gaya yang diakibatkan oleh beban gelombang dan arus dan memastikan bahwa pipa bawah laut mampu melawan gaya apung nya agar meletak di dasar laut. Pipa bawah laut harus memenuhi kriteria stabilitas secara vertikal dan lateral di dasar laut berdasarkan DNVGL-RP-F109 dengan menggunakan metode stabilitas vertikal dan metode absolute lateral static stability yakni kurang dari atau sama dengan 1. Pada penelitian ini, dilakukan analisis on-bottom stability pada saat pipa bawah laut kondisi operasi bertujuan untuk mengetahui apakah pipa bawah laut stabil secara vertikal dan lateral atau tidak. Besar gaya hidrodinamika puncak horisontal dan vertikal masing-masing dengan kedalaman 7,8 meter 9384,32 N/m dan 7087,67 N/m, sementara besar passive resistance-nya adalah 349,202 N/m. Hasil analisis stabilitas menunjukkan bahwa pipa bawah laut memenuhi kriteria stabilitas vertikal dengan nilai 0,537 sedangkan untuk kriteria absolute lateral static stability tidak memenuhi dengan nilai 12,76, serta besar error kalkulasi ANSYS CFX terhadap kalkulasi manual sebesar 0,04 atau 4%. ============== Stability analysis on the subsea pipeline needs to be done to know the stability of the subsea pipeline especially while it is in operating condition where the subsea pipeline is exposed to forces caused by wave and current loads and ensuring that the subsea pipeline is able to resist its buoyancy to lie on the seabed. The subsea pipeline must meet the vertical dan lateral stability criteria on the seabed based on DNVGL-RP-F109 by using the vertical stability method and the absolute lateral static stability method i.e. less than or equal to 1. In this study, an on-bottom stability analysis was performed when the subsea pipeline is in operating conditions aimed to know whether the subsea pipeline is vertically and laterally stable or not. The horizontal and vertical hydrodynamic peak load values respectively with a depth of 7.8 m are 9384,32 N/m and 7087,67 N/m, while the passive resistance value is 349.202 N/m. The stability analysis results show that the subsea pipeline meets the vertical stability criterion with a value of 0.537 while for absolute lateral static stability criterion does not meet with a value 12.76, and ANSYS CFX’s error calculation value against manual calculation is 0.04 or 4%.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: ANSYS CFX, DNVGL-RP-F109, On-Bottom Stability, pipa bawah laut, subsea pipeline
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA174 Computer-aided design.
T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method
T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
T Technology > TN Mining engineering. Metallurgy > TN879.5 Petroleum pipelines
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Danendra Reyhan Pahlevi
Date Deposited: 08 Feb 2019 09:10
Last Modified: 08 Feb 2019 09:10
URI: http://repository.its.ac.id/id/eprint/53708

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