Dragged Anchor Effect To Buried Subsea Pipeline On Various Cases Based On Numerical Simulation

Simanjuntak, Febrianto Anugrah (2020) Dragged Anchor Effect To Buried Subsea Pipeline On Various Cases Based On Numerical Simulation. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

The potential of oil and gas in Indonesia is large enough, reaching 7.5 billion barrels of status per 30 June 2019. The installation of oil and gas pipelines became very important role in the oil and gas industry. One of the ways used to distribute natural gas is using subsea gas pipelines. Because the subsea pipelines are under the path of the ship traffic then this can pose a risk. Such failures can be caused by damage to the pipelines, dent, leakage, rupture, and others. Causes of damage to the pipeline can be caused by the decline of anchor (dropped anchor), dragged anchor, ship sinking, exposed nets/trawlers, natural events (tsunami, volcanic eruptions, etc.), and also other factors including pipe deformation caused by soil movements and vibration. In this thesis, will analyze the cause of damage to the pipe caused by dragged anchor with a variety of anchor weight (kg) to variation to the pipe NPS (Nominal Pipe Size) variation (inch). The Data used is API Spec 5L X52, X 54, X 56, and X 60 on NPS (Nominal Pipe Size) 6, 8, 10, 12, 14, 16,18(inch). The scenario used is the heavy anchor variation and the anchor pull force against the subsea pipeline pressure. As for the weight of the anchors (kg) used on these thesis are 1590, 2100, 2640, 3300, 4050, 4890, 6000, 7350, 8700, 10500, 12300. By using Autopipe software then obtained the magnitude of pipe pressure due to the dragging of anchors using the standard ASME B 31.8. Based on the simulation results of Autopipe and Standard ASME B 31.8, it is obtained NPS (Nominal Pipe Size) 12, 14, 16, 18 (inch) do not rupture due to pressure in the pipeline after simulated. Pressure on the pipeline does not exceed 90% SMYS Combined Stress Operation Design Condition. ========================================================= Potensi migas RI terbilang cukup besar, yakni mencapai 7,5 miliar barel status per 30 Juni 2019. Instalasi pipa migas menjadi sangat penting peranannya dalam industri migas . Salah satu cara yang digunakan untuk mendistribusikan gas alam menggunakan pipa gas bawah laut. Karena pipa berada dibawah jalur lalu lintas kapal maka hal ini dapat menimbulkan risiko.Kegagalan tersebut dapat disebabkan oleh kerusakan pada lapisan saluran pipa, saluran pipa penyok (denting), terjadi kebocoran (leaking), saluran pipa pecah/putus (rupture), dan lainnya. Penyebab kerusakan pada saluran pipa tersebut dapat diakibatkan oleh penurunan jangkar (dropped anchor), penarikan jangkar (dragged anchor), kapal tenggelam (ship sinking), terkena jaring/pukat (trawl), kejadian alam (tsunami, letusan vulkanik, dll), dan juga faktor lainnya termasuk deformasi pipa yang diakibatkan oleh gerakan tanah dan vibrasi. Pada tugas akhir ini , akan menganalisa penyebab kerusakan pada pipa yang diakibatkan penarikan jangkar (dragged anchor) dengan berbagai variasi berat jangkar (kg) terhadap variasi NPS (Nominal Pipe Size) pipa (inch) . Data yang digunakan adalah API Spec 5L X52, X 54 , X 56, dan X 60 pada NPS (Nominal Pipe Size) 6, 8 , 10 , 12,14,16,18 (inch) . Skenario yang digunakan adalah variasi berat jangkar dan tarikan jangkar terhadap tekanan pipa bawah air .Adapun berat jangkar (kg) yang digunakan pada tugas akhir ini adalah 1590 , 2100 , 2640 , 3300 , 4050 , 4890 , 6000 , 7350 , 8700 , 10500 , 12300 .Dan menggunakan software Autopipe maka diperoleh besarnya tekanan pipa akibat tarikan jangkar menggunakan standard ASME B31.8. Berdasarkan hasil simulasi autopipe dan Standard ASME B31.8 , maka diperoleh NPS (Nominal Pipe Size) 12 , 14,16,18 (inch) tidak mengalami pecah (rupture) akibat tekanan dalam pipa setelah dilakukan simulasi. Tekanan pada pipa tidak melebihi 90 % SMYS Combined Stress Operation Design Condition .

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Subsea pipeline , Dragged anchor , AutopipeSoftware
Subjects: V Naval Science > V Naval Science (General) > V220 Naval ports, bases, reservations, docks, etc.
Divisions: Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Febrianto Anugrah Simanjuntak
Date Deposited: 26 Aug 2020 06:46
Last Modified: 26 Aug 2020 06:46
URI: https://repository.its.ac.id/id/eprint/81020

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