Analisis Stabilitas Support Pipeline Tipe Concrete Mattress Pada Crossing Offshore Pipeline

Abbas, Hafizhuddin Rahmansyah (2015) Analisis Stabilitas Support Pipeline Tipe Concrete Mattress Pada Crossing Offshore Pipeline. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pipeline merupakan salah satu model transportasi gas alam dan minyak bumi yang banyak digemari karena selain cepat, aman juga ekonomis. Semakin banyaknya pipa bawah laut yang sudah terinstal dapat menyebabkan kondisi persilangan (crossing). Maka, pipeline crossing harus dibuat agar pipa tetap dapat mengikuti rute yang telah ditentukan dan tidak mengganggu objek existing tersebut. Pipeline Crossing mempunyai resiko yang sangat besar. Kondisi tersebut dapat diatasi dengan perancangan rute ulang atau mendirikan support pipeline sesuai dengan kebutuhan. Oleh karena itu pipeline diusahakan tidak terlalu dekat dengan lokasi struktur lain atau sistem pipeline lain untuk menjaga jarak aman vertical (clearance) pipa dengan pipa lain minimal 0,3 meter (DNV OS-F101). Kondisi crossing tersebut mengharuskan untuk dilakukan pengecekan terhadap stabilitas struktur pipa dan support yang menopang pipa tersebut. Dalam pengerjaan tugas akhir ini mengacu pada code yang ditetapkan yaitu DNV RP-E305: On-Bottom Stability Design of Submarine Pipelines. Untuk analisa yang dilakukan pada kedua jenis support diketahui bahwa kriteria yang ditentukan untuk melawan pembebanan dari luar seperti momen overturning, sliding dan bearing pressure. Pada data diketahui jarak clearance antar pipa adalah 0,65 m. Jarak aman clearance yang diizinkan pada aturan DNV adalah 0,3 m. Penurunan tanah maksimum yang diizinkan 0,35 m. Support 1 Tipe A = 418,61 mm, Support 1 Tipe B = 380,25 mm, Support 1 Tipe C = 338,48 mm, Support 2 Tipe A = 361,81 mm, Support 2 Tipe B = 337,47 mm, Support 2 Tipe C = 271,49 mm. Dari semua jenis support tersebut yang memenuhi adalah support 1 Tipe C dan Support 2 Tipe B. Maka diperlukan mitigasi setelah terjadinya penurunan tanah pada support agar jarak clearance aman tidak terlampaui. ========================================================================================================== Pipeline is one mode of natural gas and oil transportation mode that widely preferred because of fast, safe, and economic. With more and more offshore pipelines installed, intersections can't be avoided. Because of that, pipelines crossings had to be made so that the pipelines' route and the existing pipelines is undisturbed. Pipelines crossings has a very high risk. That condition can be dealt with by re-routing the pipeline or building pipeline support as necessary. Because of that, pipelines designed to be away from another pipeline or structures to provide a safe vertical distance (clearance) between pipelines 0.3 meters (DNV OS-F101). The crossing condition demands for stability analysis of the pipe and its support structure. This final project refers to DNV RP-E305: On-Bottom Stability Design of Submarine Pipelines code. As for the analyses done to the support structures, it's analysis criteria is to resist external loads such as overturning moments, sliding, and bearing pressure. The existing clearance distance is 0,65 m. Maximum allowable settlement is 0,35 m. Support 1 Type A = 418,61 mm, Support 1 Type B = 380,25 mm, Support 1 Type C = 338,48 mm, Support 2 Type A = 361,81 mm, Support 2 Type B = 337,47 mm, Support 2 Type C = 271,49 mm. From supports above, the most qualified support is Support 1 Type C and Support 2 Type B. Mitigation is required after soil settlement occured on the support structures so that the clearance won't be exceeded.

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 665.544 Abb a
Uncontrolled Keywords: crossing pipeline, on-bottom stability, support pipeline, settlement
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions: Faculty of Marine Technology > Ocean Engineering > (S1) Undergraduate Theses
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 19 Feb 2018 04:34
Last Modified: 24 Aug 2018 01:49
URI: http://repository.its.ac.id/id/eprint/51293

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