Analisis Pengaruh Jumper Spool terhadap Service Life Pipa Bawah Laut Eksisting dengan Variasi Laju Korosi Internal pada Kondisi Operasional

Mukhsin, Bagus Ali (2026) Analisis Pengaruh Jumper Spool terhadap Service Life Pipa Bawah Laut Eksisting dengan Variasi Laju Korosi Internal pada Kondisi Operasional. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pipa bawah laut merupakan komponen utama dalam sistem transportasi hidrokarbon lepas pantai yang harus mampu mempertahankan integritas struktural selama masa operasi. Seiring bertambahnya umur operasi, korosi internal menyebabkan penurunan ketebalan dinding pipa (wall thinning) yang berdampak pada peningkatan tegangan dan penurunan service life. Pada pengembangan fasilitas baru, pemasangan Jumper Spool sebagai konfigurasi subsea tie-in diperlukan untuk menghubungkan pipa eksisting dengan fasilitas baru. Namun, modifikasi tersebut berpotensi mengubah distribusi tegangan dan integritas struktur pipa yang telah mengalami degradasi akibat korosi. Penelitian ini bertujuan menganalisis kondisi integritas pipa bawah laut eksisting yang mengalami korosi internal, mengevaluasi pengaruh konfigurasi Jumper Spool dan Direct Tie-In terhadap distribusi tegangan, serta membandingkan service life kedua konfigurasi tersebut pada berbagai variasi laju korosi. Analisis dilakukan menggunakan AutoPIPE berdasarkan kriteria limit state DNV-ST-F101. Estimasi service life dilakukan menggunakan metode remaining life dan iterasi penurunan ketebalan hingga mencapai kondisi gagal (fail). Hasil penelitian menunjukkan bahwa peningkatan laju korosi meningkatkan nilai Unity Check (UC) pada seluruh kriteria limit state. Pada kondisi eksisting, propagation buckling menjadi governing failure criteria dengan estimasi service life sebesar 85, 60, dan 50 tahun. Setelah pemasangan Jumper Spool, governing failure criteria bergeser menjadi equivalent stress (Von Mises) sehingga service life menurun menjadi 50, 35, dan 29 tahun. Sementara itu, konfigurasi Direct Tie-In menghasilkan nilai UC > 1,0 pada seluruh variasi korosi sehingga dinyatakan fail pada kondisi operasional. Hasil penelitian menunjukkan bahwa meskipun Jumper Spool menurunkan service life dibandingkan kondisi eksisting, konfigurasi tersebut tetap memiliki kinerja integritas yang lebih baik dibandingkan Direct Tie-In dan lebih layak diterapkan sebagai konfigurasi subsea tie-in pada pipa bawah laut eksisting.
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Subsea pipelines are critical components of offshore hydrocarbon transportation systems that must maintain their structural integrity throughout their operational life. As the pipeline ages, internal corrosion causes wall thinning, leading to increased stress levels and reduced service life. In offshore field development, the installation of a Jumper Spool is commonly required as a subsea tie-in configuration to connect an existing pipeline to a new facility. However, this modification may alter the stress distribution and structural integrity of a corroded pipeline system. This study aims to evaluate the integrity of an existing subsea pipeline subjected to internal corrosion, investigate the effects of Jumper Spool and Direct Tie-In configurations on stress distribution, and compare the service life of both configurations under different internal corrosion rates. Structural analyses were performed using AutoPIPE based on the limit state criteria specified in DNV-ST-F101. The service life was estimated using the remaining life approach and iterative wall-thickness reduction until the failure condition was reached. The results indicate that increasing the internal corrosion rate leads to higher Unity Check (UC) values for all evaluated limit state criteria. For the existing pipeline, propagation buckling was identified as the governing failure criterion, with estimated service lives of 85, 60, and 50 years for the three corrosion-rate scenarios. After the installation of the Jumper Spool, the governing failure criterion shifted to equivalent stress (Von Mises), reducing the estimated service life to 50, 35, and 29 years. In contrast, the Direct Tie-In configuration produced UC values exceeding the allowable limit (UC > 1.0) under all corrosion-rate scenarios and was therefore classified as failed under the operating condition. Although the Jumper Spool configuration reduced the service life compared with the existing condition, it provided better structural integrity performance than the Direct Tie-In configuration and is therefore considered the more suitable subsea tie-in configuration for an existing subsea pipeline.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	pipa bawah laut, jumper spool, direct tie-in, korosi internal, service life, AutoPIPE, DNV-ST-F101, subsea pipeline, jumper spool, direct tie-in, internal corrosion, service life, AutoPIPE, DNV-ST-F101.
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. 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:	Bagus Ali Mukhsin
Date Deposited:	24 Jul 2026 03:48
Last Modified:	24 Jul 2026 03:48
URI:	http://repository.its.ac.id/id/eprint/135935

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