Perencanaan Articulated Concrete Block Mattress pada Pipa Bawah Laut, Studi Kasus: Subsea Pipelines Milik PT. Y.

Kurniawan, Ignatius Tito (2023) Perencanaan Articulated Concrete Block Mattress pada Pipa Bawah Laut, Studi Kasus: Subsea Pipelines Milik PT. Y. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisis on-bottom stability merupakan gaya keseimbangan sederhana atau analisis elemen hingga yang diperinci/didetailkan. DNV-RP-F109 merupakan standard internasional yang menyediakan metode desain dan kriteria yang diizinkan agar pipa bawah laut dapat mencapai stabilitas vertikal dan lateral. Dalam mencapai stabilitas vertikal dan lateral, subsea pipelines dapat dibantu dengan melakukan penambahan material berupa concrete weight coating atau bisa juga menggunakan metode armor cover jenis articulated concrete block mattress. Dalam Tugas Akhir ini terdapat sebuah permasalahan dimana subsea pipelines milik PT. Y. yang beroperasi sepanjang KP 0+0.0 – KP 0+0.512 mengalami kebocoran akibat telah mencapai batas umur operasi. Pada subsea pipelines sepanjang KP 0+0.0 – KP 0+0.512 tersebut akan dilakukan replacement menggunakan spare pipa lama tanpa adanya concrete weight coating sebagai pemberat. Pemberat tersebut nantinya akan digantikan menggunakan articulated concrete block mattress. Berat articulated concrete block mattress yang dibutuhkan subsea pipelines sepanjang KP 0+0.0 – KP 0+0.512 adalah 47200 kg , 70800 kg (SF = 1.5), dan 94390 kg (SF = 2). Dimensi articulated concrete block mattress yang digunakan memiliki panjang 7 meter dan lebar 7 meter dengan block berbentuk square frustum berdimensi sisi atas 0.24 m x 0.24 m, sisi tengah 0.39 m x 0.39 m dan tebal 0.3 m. Kriteria stabilitas vertikal dan lateral subsea pipelines setelah diselimuti dengan articulated concrete block mattress memiliki nilai 0.45 dan 0.377 (kondisi instalasi), 0.472 dan 0.575 (kondisi operasi). Dapat disimpulkan kriteria nilai pada masing-masing kondisi memenuhi syarat stabilitas DNV-RP-F109 yaitu ≤ 1.00.
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On-bottom stability is a simple balance style or an analysis of finite elemet to detailed. DNV-RP-F109 is an internatioal standard that provives allowes design and criteria so that subsea pipelines can attain vertical and lateral stability. In reaching vertical and lateral stability, subsea pipelines can be helped by adding material like concrete weight coating or may also method of armor cover, articulated concrete block mattress. In this final task, there is a problem where the subsea pipelines owned by PT. Y. operating throughout the KP 0+0.0 – KP 0+0.512 expereinced leakage resulting has reached the operating life limit. The subsea pipelines along KP 0+0.0 – KP 0+0.512 will be replaced using an old pipe spare without the presence of concrete weight coating as wrapping. It will be replaced with articulated concrete block mattress. The weight of articulated concrete block mattress required for subsea pipelines along KP 0+0.0 – KP 0+0.512 is 47200 kg, 70800 kg (SF = 1.5), and 94390 kg (SF=2). Articulated concrete block mattress dimension used has length 7 meters and width 7 meters with square frustum shaped blocks of upper dimensional 0.24 m x 0.24 m, mid-side 0.39 m x 0.39 m, and thick 0.3 m. Vertical and lateral stability criteria of subsea pipelines after being covered with articulated concrete block mattress have values of 0.45 and 0.377 ( installation condition), 0.472 and 0.575 (operating condition). Can be assumed up the value criteria meets the stability criteria of DNV-RP-F109 is ≤ 1.00.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	On-bottom stability, replacement, articulated concrete block mattress, square frustum
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:	Ignatius Tito Kurniawan
Date Deposited:	27 Jul 2023 04:00
Last Modified:	27 Jul 2023 04:00
URI:	http://repository.its.ac.id/id/eprint/100285

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