Analisis Keandalan Pipa pada Proses Instalasi Metode S-Lay dengan Variasi Pre Tension

Santosa, Sintya Dewi (2025) Analisis Keandalan Pipa pada Proses Instalasi Metode S-Lay dengan Variasi Pre Tension. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pipa bawah laut adalah alat transportasi yang berperan penting dalam memenuhi penyediaan kebutuhan minyak dan gas. Sebelum dioperasikan, pipa bawah laut harus diinstal terlebih dahulu. Dalam tugas akhir ini, telah dilakukan analisis keandalan terhadap struktur pipa bawah laut saat proses instalasi dengan menggunakan metode S-lay dengan pengaruh variasi dari kedalaman lokasi instalasi dan besar tension pada tensioner. Data pipa yang digunakan dalam analisis ini merupakan pipa standar API 5L Grade X65 dengan batas SMYS 450 MPa. Analisis keandalan dilakukan dengan melihat kriteria tegangan berdasarkan DNVGL ST F101. Tegangan von mises yang didapatkan dari analisis dinamis menjadi moda kegagalan untuk mengetahui keandalan dari struktur pipa bawah laut pada kondisi instalasi. Hasil analisis menunjukkan bahwa tegangan von mises pada overbend lebih tinggi dibandingkan pada sagbend. kecenderungan tegangan von mises juga mengalami kenaikan baik di daerah overbend maupun sagbend. Sedangkan, untuk pengaruh dari besar tension pada tensioner memberikan pengaruh yang berbeda-beda di setiap kondisi statis dan dinamis. Untuk kondisi statis, kenaikan tension cenderung menurunkan tegangan von mises secara signifikan pada bagian sagbend dan overbend. Selain itu, peneliti juga menghitung keandalan yang terjadi pada setiap variasi tension pada tensioner. Keandalan terkecil didapatkan pada variasi 80 MT di setiap kondisi.
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Subsea pipelines are a vital means of transportation for meeting oil and gas supply needs. Before they can be operated, subsea pipelines must first be installed. In this final project, a reliability analysis was conducted on the structure of subsea pipelines during the installation process using the S-lay method, taking into account the effects of variations in installation depth and tension on the tensioner. The pipeline data used in this analysis is an API 5L Grade X65 standard pipeline with an SMYS limit of 450 MPa. The reliability analysis was conducted by examining stress criteria based on DNVGL ST F101. The von Mises stress obtained from the dynamic analysis serves as the failure mode to assess the reliability of the subsea pipeline structure under installation conditions. The analysis results show that the von Mises stress at the overbend is higher than at the sagbend. The von Mises stress trend also increases in both the overbend and sagbend areas. Meanwhile, the effect of tension magnitude on the tensioner varies under static and dynamic conditions. Under static conditions, an increase in tension tends to significantly reduce von Mises stress in both sagbend and overbend sections. Additionally, the researchers calculated the reliability under each variation of tension in the tensioner. The lowest reliability was observed at the 80 MT variation under all conditions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pipa bawah laut, Keandalan, Instalasi, : Subsea pipeline, Reliability, Installation
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials.
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Sintya Dewi Santosa
Date Deposited:	21 Jul 2025 07:35
Last Modified:	21 Jul 2025 07:35
URI:	http://repository.its.ac.id/id/eprint/120315

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