Desain Subsea Pipeline dari Platform A ke Platform B Sebagai Pengganti Pipa Eksisting pada Blok Onwj

Wicaksono, Muhammad Singgih (2026) Desain Subsea Pipeline dari Platform A ke Platform B Sebagai Pengganti Pipa Eksisting pada Blok Onwj. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pipa bawah laut Main Oil Line (MOL) yang menghubungkan Platform A dan Platform B pada Blok Offshore North West Java (ONWJ) telah beroperasi dalam jangka panjang dan memiliki riwayat kebocoran, sehingga diperlukan penggantian pipa untuk menjaga keandalan operasi. Penelitian ini bertujuan merancang pipa bawah laut pengganti serta mengevaluasi kelayakan instalasinya menggunakan metode S-Lay, melalui perhitungan ketebalan dinding, evaluasi on-bottom stability, analisis tegangan kondisi operasi dan hydrotest menggunakan AutoPIPE, serta analisis instalasi statis menggunakan OrcaFlex. Hasil penelitian menunjukkan bahwa ketebalan nominal pipa sebesar 12,7 mm dipilih berdasarkan kebutuhan minimum wall thickness sebesar 10,30 mm. Evaluasi on-bottom stability menunjukkan bahwa pipa memerlukan concrete weight coating setebal 40 mm agar memenuhi stabilitas lateral dan vertikal. Hasil analisis tegangan menunjukkan bahwa kondisi operasi dan hydrotest masih berada di bawah batas izin. Pada tahap instalasi, konfigurasi sudut stinger 11° dan nominal lay tension 40 MT direkomendasikan karena menghasilkan regangan overbend, tegangan sagbend, serta posisi Touch Down Point (TDP) yang masih memenuhi kriteria instalasi. Verifikasi silang hasil OrcaFlex terhadap perhitungan analitik menghasilkan deviasi sebesar 0,01–0,46% pada regangan overbend dan 3,60–5,64% pada tegangan sagbend, yang menunjukkan konsistensi antara hasil numerik dan analitik. Dengan demikian, pipa pengganti dinyatakan memenuhi aspek desain, stabilitas, integritas operasi, dan layak diinstalasi menggunakan metode S-Lay.
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The existing Main Oil Line (MOL) subsea pipeline connecting Platform A and Platform B in the Offshore North West Java (ONWJ) Block has been in long-term service and has experienced leakage history, requiring replacement to maintain operational reliability. This study aims to design the replacement subsea pipeline and evaluate its installation feasibility using the S-Lay method through wall thickness calculation, on-bottom stability assessment, operating and hydrotest stress analysis using AutoPIPE, and static installation analysis using OrcaFlex. The results show that a nominal wall thickness of 12.7 mm is selected based on the minimum required wall thickness of 10.30 mm. The on-bottom stability assessment indicates that a 40 mm concrete weight coating is required to satisfy both lateral and vertical stability criteria. The stress analysis confirms that the operating and hydrotest conditions remain below the allowable limits. For the installation stage, an 11° stinger angle and 40 MT nominal lay tension are recommended because the overbend strain, sagbend stress, and Touch Down Point (TDP) position satisfy the installation criteria. Cross-verification of the OrcaFlex results against analytical calculations produced deviations of 0.01–0.46% for the overbend strain and 3.60–5.64% for the sagbend stress, indicating consistency between the numerical and analytical results. Therefore, the replacement pipeline meets the design, stability, and operational integrity requirements and is technically feasible to be installed using the S-Lay method.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	pipa bawah laut, desain pipa, on-bottom stability, AutoPIPE, S-Lay, OrcaFlex, subsea pipeline, pipeline design, on-bottom stability, AutoPIPE, S-Lay, OrcaFlex
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA660.P55 Underground pipeline design, construction and management T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines.
Divisions:	Faculty of Marine Technology (MARTECH) > Offshore Engineering > 54040-(S1) Undergraduate Thesis
Depositing User:	Muhammad Singgih Wicaksono
Date Deposited:	28 Jul 2026 01:53
Last Modified:	28 Jul 2026 01:53
URI:	http://repository.its.ac.id/id/eprint/138026

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