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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Abdimas BSI: Jurnal Pengabdian Kepada Masyarakat INOVTEK POLBENG Gorontalo Fisheries Journal Wave: Jurnal Ilmiah Teknologi Maritim JURNAL SAINTIS Specta Journal of Technology International Journal of Marine Engineering Innovation and Research Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Jurnal Pengabdian kepada Masyarakat Journal of Materials Exploration and Findings Indonesian Journal of Maritime Technology or abbreviated (ISMATECH) WAVE: Jurnal Ilmiah Teknologi Maritim
Luh Putri Adnyani
Institut Teknologi Kalimantan
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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PERANCANGAN PERHITUNGAN PERSENTASE PEKERJAAN REPARASI KAPAL BERDASARKAN METODE PPIC PT. MERANTI NUSA BAHARI DENGAN MENGGUNAKAN FUZZY LOGIC Luh Putri Adnyani; Raka Whibiseno
WAVE: Jurnal Ilmiah Teknologi Maritim Vol. 13 No. 1 (2019)
Publisher : National Research and Innovation Agency (BRIN Publishing)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pekerjaan reparasi kapal memiliki item pekerjaan yang harus diselesaikan, yang ditulis di dalam work order. Jumlah uang yang dibayarkan berdasar pada item pekerjaan yang telah diselesaikan dalam bentuk persentase. Galangan di Indonesia umumnya menggunakan metode konvensional yang dapat menimbulkan perbedaan pendapat antara pihak owner dan galangan. Divisi PPIC PT. Meranti Nusa Bahari merancang metode untuk menghitung persentase pekerjaan dengan hasil yang transparan. Pada penelitian ini dilakukan perancangan metode yang memiliki hasil transparan dan berbentuk sederhana dengan menggabungkan metode konvensional dengan metode PPIC PT. Meranti Nusa Bahari. Perancangan metode perhitungan persentase pekerjaan ini dilakukan pada studi kasus pekerjaan reparasi BG. Merry. Metode ini dirancang dengan menulis program sesuai dengan perhitungan persentase yang dirancang oleh divisi PPIC PT. Meranti Nusa Bahari dan disusun secara sederhana seperti metode konvensional dengan menggunakan fuzzy logic. Fuzzy logic merupakan metode pemrograman untuk melakukan analisa pada suatu data dengan memproses data atau nilai-nilai yang rumit dan mengubahnya menjadi kesimpulan atau output yang mudah diterima dan ditafsirkan manusia. Simulasi perhitungan persentase pekerjaan dilakukan pada nilai 25%. Hasil perbandingan persentase pekerjaan metode rancangan PPIC PT. Meranti Nusa Bahari, metode konvensional dan metode fuzzy logic adalah: 25,32%, 28,10% dan 25,54%. Dari penelitian didapatkan bahwa metode perhitungan persentase yang dirancang menggunakan fuzzy logic dapat menghasilkan nilai persentase yang transparan dan berbentuk sederhana.
Integrity Assessment of Dented Aboveground Steel Storage Tank After Hydrostatic Testing Wira Herucakra; Luh Putri Adnyani
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 2 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i2.6386

Abstract

This paper presents a comprehensive structural integrity assessment of a 50,000-kiloliter aboveground steel storage tank that experienced shell denting during hydrostatic testing. Dents and geometric imperfections are known to significantly affect the buckling behavior and load-bearing capacity of storage tanks. To evaluate the tank’s fitness for service (FFS), a Level 3 assessment was conducted following API 579-1/ASME FFS-1 Part 8 standards. Finite element analysis was employed to simulate the elastic stress distribution and fatigue behavior under various loading conditions, including hydrostatic pressure, wind, and seismic loads. Results revealed that shell course 7 and 8 experienced stress increases of up to 2282% compared to the undistorted condition, with von Mises stress remaining below the allowable limits. A fatigue analysis confirmed that stress amplitudes were below the fatigue threshold, resulting in infinite fatigue life. Furthermore, discharge simulation indicated that improper dewatering could induce external pressure exceeding the material’s yield strength, leading to localized plastic deformation. Nevertheless, the dented tank was found to be structurally sound and compliant with API 650 and API 579-1/ASME FFS-1 criteria. The study highlights the importance of proper discharge procedures and confirms that no immediate repair is required for continued safe operation of the tank.
Influence of Velocity on Hydrodynamic Flow Characteristics around Subsea Pipelines: A Numerical Analysis Luh Putri Adnyani; Samsu Dlukha Nurcholik; Destyariani Liana Putri
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 3 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i3

Abstract

This study investigates the influence of flow velocity on hydrodynamic flow characteristics around free-span subsea pipelines using computational fluid dynamics (CFD). Simulations were conducted at flow velocities of 1.1 m/s, 2.5 m/s, and 3.0 m/s to examine changes in mean flow field, bed shear stress, pressure distribution, and wake development. Results show that increasing velocity transitions the wake from stable laminar to turbulent with fully developed vortex streets, intensifying vortex shedding, wake asymmetry, and unsteady forces. Higher velocities significantly amplify peak bed shear stress, adverse pressure gradients, and the depth of velocity deficits, leading to prolonged wake recovery and increased turbulence. These effects have critical implications for vortex-induced vibration (VIV), hydrodynamic loading, and scour potential, emphasizing the need to consider velocity variation in the design and integrity assessment of subsea pipelines.
Co-Authors ,, Alamsyah Adrian Gunawan Arsyad, Muhammad Abid Mapariorio Destyariani Liana Putri Dianiswara, Anggoronadhi Fadeli Muhammad Habibie Harahap, Rima Gusriana Herucakra, Wira Herucakra, Wira, Sr. Structure Engineer Ikhwani, Rodlian Jamal Illa Rizianiza Indira Anggriani Lukytoardi Megantoro Nur Aisyah Nurmawati Nurmawati Nurmawati Nurmawati Nurmawati Nurmawati, N Prasetyo, IC Farid Hadi Putri, Destyariani Liana Rahmasari, Nindy widia Devi Raka Whibiseno Reza Furqan Arrachman Rimeily Rizkhita, Alviani Rahma Samsu Dlukha N Samsu Dlukha Nurcholik Siregar, Hifzul Anwar Suci, Indah Melati Sulistijono, S. Syarief, Rafi Irsyad Whibiseno, Raka Wira Herucakra Wira Herucakra Wirawan, Muhammad Khaisar wulandari, amalia ika