ANALISA SCOURING PIPA BAWAH LAUT MILIK PETRONAS CARIGALI KETAPANG II LTD. BUKIT TUA DEVELOPMENT PROJECT KETAPANG PSC

RASYADI, FARIS (2016) ANALISA SCOURING PIPA BAWAH LAUT MILIK PETRONAS CARIGALI KETAPANG II LTD. BUKIT TUA DEVELOPMENT PROJECT KETAPANG PSC. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pipa bawah laut (Pipeline) adalah salah satu fasilitas yang memegang peranan penting dalam siklus distribusi minyak dan gas bumi di Indonesia. Penggunaan pipa bawah laut terbukti menjadi infrastruktur transportasi jarak jauh minyak dan gas bumi yang paling efisien karena bisa bekerja selama 24 jam sehari tanpa henti dan tidak terkendala oleh cuaca.. Banyak masalah yang muncul pada sistem perpipaan bawah laut, seperti stabilitas pipa saat terkena beban – beban hidrodinamis atau fenomena scouring yang dapat menimbulkan bentangan bebas (freespan) pada pipa yang bisa mengakibatkan defleksi pada pipa. Penelitian ini membahas perihal bagaimana stabilitas pipa bawah laut baik secara vertikal maupun lateral dan berapa kedalaman serta lebar scouring yang terjadi di sepanjang jalur pipa bawah laut. Berdasarkan hasil analisa stabilitas pipa bawah laut didapat nilai pada perairan dalam maupun transisi sebesar 1,86 dan nilai pada perairan transisi sebesar 5,8 dan sebesar 4,95 pada perairan dalam. Dari hasil perhitungan tersebut pipa bawah laut dapat dikatakan stabil secara vertikal maupun lateral karena nilainya lebih besar dari safety factor sebesar 1,1 sebagaimana disyaratkan oleh code DNV RP E305. Fenomena gerusan lokal (scouring) juga terjadi pada jalur pipa bawah laut ini. Berdasarkan analisa didapatkan estimasi kedalaman lubang scour maksimum sebesar 0,54 m dan estimasi lebar lubang scour maksimum sebesar 3,87 m. =================================================================================================== Underwater pipeline is one of the facilities that held important role on oil and gas distribution cycle in Indonesia. The usages of underwater pipeline are proven to be the most efficient long haul transportation structure, because of the ability to work 24 hours nonstop even in a heavy rain. There are lots of problems spawning on underground pipeline such as pipeline stability due to hydrodynamics load, or scouring phenomena which could lead to freespan, continuing to pipeline deflection. This experiments discussed about underwater pipeline stability in vertical and lateral form, and also the width and depth of scouring which happens nearby the pipeline. Based on the results of underwater pipeline stability analysis, the value of SFv in deep water and intermediate water is 1.86 and the value of SFl in intermediate water is 5.85 and 4.95 in deep water. Based on those calculations underwater pipeline can be considered stable vertically or laterally, assuming their amount are greater than safety factor, valued 1.1 according to DNV RP E305. Scouring phenomena are also happened on this underwater pipeline. Based on the analysis, the estimated depth of scour maximum is valued at 0.54 m and estimated scour length maximum valued at 3.87 m.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Stabilitas Pipa, Soil Liquefaction, Scouring
Subjects: T Technology > T Technology (General)
T Technology > TC Hydraulic engineering. Ocean engineering
Divisions: Faculty of Marine Technology > Ocean Engineering > (S1) Undergraduate Theses
Depositing User: Mr. Fandika aqsa
Date Deposited: 11 Jan 2017 03:37
Last Modified: 27 Dec 2018 06:21
URI: http://repository.its.ac.id/id/eprint/1469

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