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.
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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 (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| 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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