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All Journal Rotasi Jurnal Teknik ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science REKAYASA Jurnal Teknik Sipil Adi Widya : Jurnal Pengabdian Masyarakat IJOCE (International Journal of Offshore and Coastal Engineering) Wave: Jurnal Ilmiah Teknologi Maritim International Journal of Marine Engineering Innovation and Research Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Sewagati
Rudi Walujo Prastianto
Departemen Of Ocean Engineering, Faculty Of Marine Technology, Institut Teknologi Sepuluh Nopember
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education 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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Fatigue Life Analysis of FSO Anchor Chain with Corrosion Effect Dewinta Putri Cahyaningtyas; Nur Syahroni; Rudi Walujo Prastianto; Eko Budi Djatmiko; Murdjito Murdjito; Hafizh Muhammad Naufal Shidqi
International Journal of Marine Engineering Innovation and Research Vol 8, No 2 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i2.16942

Abstract

In this study, the authors analyze the fatigue life of the anchor chain used to secure the Gamkonora FSO to the seabed. The objective is to determine the operational lifespan of the anchor chain by considering its fatigue life. The research begins with an analysis of the movement of the Gamkonora FSO under environmental loads in both free-floating and moored conditions to determine the tension in each anchor chain. Next, the anchor chain tension is calculated for various corrosion levels, namely 0%, 5%, 10% and 15%. Subsequently, the tension range and damage ratio values are determined using the T-N curve method based on Palmgren Miner’s failure law, with failure estimation carried out using the rainflow counting method. The numerical modeling results reveal that the largest translational motion behavior of the FSO occurs during heave motion, reaching 1.409 m/m, while the largest rotational motion is observed during roll motion, with a value of 3.463 deg/m when the FSO is fully loaded. The maximum tension recorded in the anchor chain is 1,695.14 kN at heading 90 under 0% corrosion conditions, with a safety factor of 4.53. Furthermore, the cumulative damage value from the T-N curve is obtained, with the largest value recorded as 0.0702. Based on the cumulative damage, the fatigue life of the anchor chain is estimated to be 14.25 years during its operational lifespan.
Upaya Peningkatan Wawasan Maritim bagi Siswa SMA pada Sosialisasi Penerapan dan Implementasi K3 Bersama Nelayan di Kelurahan Kedung Cowek Sambodho, Kriyo; Mulyadi, Yeyes; Syahroni, Nur; Murdjito; Prastianto, Rudi Walujo; Wahyudi; Handayanu
Sewagati Vol 8 No 2 (2024)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v8i2.899

Abstract

Sebagian besar mata pencaharian masyarakat Nambangan Perak, Kelurahan Kedung Cowek, Kecamatan Bulak, Kota Surabaya adalah sebagai nelayan tradisional dan pedagang ikan. Namun, pada tahun 2022 bulan September terdapat seorang nelayan yang hilang saat mencari ikan di perairan laut Nambangan Perak. Kasus hilangnya nelayan tersebut mendorong Tim Pengabdian Masyarakat Teknik Kelautan FTK ITS untuk membuat suatu kegiatan berupa pencerdasan/ sosialisasi guna meningkatkan pemahaman bidang K3 (Keselamatan dan Kesehatan Kerja) di masyarakat Nambangan Perak. Kegiatan pengabdian kepada masyarakat yang dilaksanakan oleh Tim Abmas Teknik Kelautan FTK ITS terbagi menjadi dua rangkaian kegiatan. Kegiatan pertama dilaksanakan di SMAN 6 Surabaya dengan tujuan untuk meningkatkan pemahaman dan pengelolaan potensi sumber daya kelautan di kalangan siswa dan kegiatan kedua dilaksanakan di Nambangan Perak Surabaya sebagai bentuk edukasi kepada nelayan tradisional tentang keselamatan dan kesehatan kerja (K3), kewaspadaan nelayan dan pengembangan sumber daya manusia. Tujuan dilaksanakannya kegiatan pengabdian masyarakat ini adalah untuk mengedukasi siswa SMA melalui aktivitas pencerdasan sehingga siswa sekolah semakin menyadari pentingnya potensi bidang maritim untuk kemajuan dan kesejahteraan masyarakat Indonesia.
Analisis Dinamis dan Kekuatan pada Fase Instalasi Struktur Well Jumper Kurniawan, Ilham; Prastianto, Rudi Walujo; Murdjito, Murdjito; Rachmadiarto, Fajar
Jurnal Teknik ITS Vol 13, No 2 (2024): IN PRESS (Artikel masih bisa bertambah)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v13i2.147376

Abstract

Untuk menyalurkan gas alam dari sumur bawah laut menuju processing platform diperlukan pipa penyalur antara x-mas tree dan PLEM, yaitu pipa well jumper. Proses instalasi Well jumper sangat berisiko, karena bentuknya yang panjang dan sangat langsing sehingga cukup lentur. Penanganan yang tidak tepat bahkan bisa menyebabkan kegagalan pada pipanya. Penelitian ini menganalisis secara dinamis kekuatan struktur saat fase penurunan well jumper dengan simulasi numerik menggunakan software. Selama proses instalasi analisis dilakukan pada tiga kondisi: saat di udara (in air), fase di splash zone, hingga tenggelam (submerged). Pada tiap fase diidentifikasi tension dan lokasi kritis tegangan pada struktur untuk beberapa arah (heading) pembebanan. Hasil analisis menunjukkan tension terbesar pada sling terjadi pada saat kondisi in air dan akan berkurang saat memasuki splash zone, dan semakin berkurang ketika sudah tenggelam 100%. Hal ini akibat efek gaya apung dari struktur tersebut. Meskipun tension sling terbesar terjadi pada kondisi in air, tegangan terbesar pada struktur justru terjadi pada saat di splash zone. UC (unity check) terbesar terjadi pada lifting point (LS 3) pada saat kondisi sebesar 0,25 dan meningkat menjadi 0,286 pada saat di splash zone. Bearing stress dan shear stress yang terjadi pada padeye (LS 3) masih dalam kondisi aman, dengan stress ratio sebesar 0,1 dan 0,15.
Analisis Stabilitas Intact Sudut Besar terhadap Perubahan COG Crane barge saat Operasi Heavy Lifting Hafshah, Nailatul Fadhilah; Murdjito, Murdjito; Prastianto, Rudi Walujo
Jurnal Teknik ITS Vol 13, No 2 (2024): IN PRESS (Artikel masih bisa bertambah)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v13i2.147926

Abstract

Crane barge sebagai floating crane vessel dapat dioperasikan untuk operasi heavy lifting yang mampu mengangkat beban hingga ribuan ton salah satunya adalah saat instalasi topside. Beban yang diangkat berdampak pada perubahan titik pusat massa (COG) yang akan mempengaruhi stabilitas crane barge selama operasi lifting berlangsung. Dengan skenario perputaran sudut crane secara horizontal dari sisi starboard hingga sisi port crane barge dan variasi tinggi draft dari 75% hingga 100% kondisi full load. Hasil keseluruhan loadcase stabilitas intact crane barge secara numerik memenuhi ketentuan dari IMO A.749(18). GZ maksimum terjadi pada sudut putar 90⁰ ke arah portside untuk heel 20⁰ untuk ketiga variasi draft dan draft 90% terjadi saat heel 25⁰. Korelasi perubahan draft terhadap besar nilai GZ adalah semakin tinggi draft yang diaplikasikan maka diperoleh nilai GZ yang semakin kecil. COG setelah analisis stabilitas mengalami perubahan yang signifikan pada setiap variasi draft sedangkan terhadap perubahan sudut putar perubahan hanya terjadi pada besar VCG crane barge. Perbandingan hasil perhitungan analisis stabilitas crane barge secara numerik dan analitik memiliki koreksi nilai error yang telah memnuhi ketentuan dari IACS UR L5 yaitu dibawah ±5%. Nilai error terbesar terjadi pada sudut kemiringan 60⁰. Perbedaan stabilitas sudut kecil dan sudut besar adalah sudut kecil hanya dipengaruhi oleh besar kemiringan sudut sin θ sedangkan pada stabilitas sudut besar akibat kemiringan yang berlebih nilai GZ tidak hanya dipengaruhi sudut sin θ melainkan juga sudut tan θ.
Numerical Study on the Fluid Forces of a Rigid Cylinder Covered by Helical Rods with Gap Due to the Variations of Incoming Flow Direction and Pitch at Reynolds Number 1000 Syarifuddin, Arief; Prastianto, Rudi Walujo; Silvianita, Silvianita
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 16 No 1 (2015): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v16i1.459

Abstract

Offshore structures such as a jacket platform, risers, conductors, mooring lines, Spars, and pipelines, are subject to severe vibration due to Vortex-induced vibration (VIV). This vibration can lead the structures to fatigue failure. One of a passive suppression device which effectively reduces the VIV is in the form of triple helical rods with gap covered to a cylinder. The present paper specially discusses the influence of incoming flow direction and pitch of helix on the induced fluid forces acting on the cylinder due to addition of helical rods at Reynolds number (Re) of 103. The configuration produced best reduction on drag and lift forces in CFD simulation are with 30D length of pitch for the incoming flow direction of 0° and 60°. Reduction on the drag and lift forces for incoming flow directions of 0° and 60° are respectively, 11.34% and 88.32%, and 10.99% and 97.94%.
Local Analysis of The Padeye-Brace Clamp Structure Strength during Installation of Riser-Spool at Offshore Platform Prastianto, Rudi Walujo; Nahar, Yusapril Hagie Syamsun; Hadiwidodo, Yoyok Setyo
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19332

Abstract

The need for natural gas in Indonesia has developed very rapidly, thus encouraging the construction of many production support facilities. One of them is the Wellhead Platform B (WHP-B) in West Pangkah waters, East Java. This production platform is in shallow water conditions with a depth of less than 5 m and a distance of less than 5 km from the shoreline. Therefore, when the pipe installation process is carried out, a crane barge or construction vessel type cannot be used. To be able to connect the gas flow from the well to the production platform (WHP-B), it requires a supporting structure in the form of a spool and riser. The size of the spool and riser that will be installed on WHP-B is 16” and 6” with the condition that the riser and spool are connected. A crawler crane carried by a barge can be used for the installation process to occur efficiently. For the 16”-6” riserspool to be lowered simultaneously, it requires a temporary structure that serves to clamp the two pipes so that they can be installed simultaneously. This structure is a modification between the padeye and the brace clamp. The process of lowering the 16”- 6” riser-spool experienced a critical condition when it was in the splash zone. Based on the global analysis results, it is known that the UC that occurs is 0.97 with a vertical bending stress of 172.36 MPa in the 3rd padeye-brace clamp structure. After conducting local analysis on the 3rd brace clamp, it is known that the clamp structure is still in a safe condition with a maximum von Mises stress of 2.42 MPa and a maximum deformation of 0.0096 cm.
Reliability of Jacket-Type Structure Considering the Reserve Strength Ratio (RSR) Tito, Brigitta Violyna El; Prastianto, Rudi Walujo; Rosyid, Daniel Mohammad
International Journal of Marine Engineering Innovation and Research Vol 9, No 2 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i2.20435

Abstract

According to the International Energy Agency (IEA), the projected global energy demand will continue to increase by 45% by 2030, with an average growth rate of about 1.6% per year. Oil and gas are estimated to fulfil about 80% of the world's energy needs. One facility that supports oil and gas exploitation is an offshore structure of the jacket-type platform. The challenge in building a jacket platform is the cost and reliability of the structure. Costs must be kept to a minimum to maintain stable production prices. Offshore structures are designed to withstand extreme wave loads that can cause the collapse of individual components or the entire structure. So, it is necessary to analyze the ultimate strength of the jacket structure. Therefore, the author will conduct an ultimate strength analysis using the Non-Linear Pushover Analysis method to obtain the Reserve Strength Ratio (RSR). After that, a reliability analysis is carried out to determine the reliability of the structure under ultimate conditions using the Monte Carlo Simulation (MCS) method. The pushover analysis results in an RSR on the structure of 9.33. The results of the analysis of the reliability of the structure are 0.99997
Co-Authors Abdul Azhim Agoes Pratikto Bagus Panuntun Daniel Muhammad Rosyid Dendy Satrio Dewinta Putri Cahyaningtyas Dhanis, Wimala Lalitya Dyah Ayu Puspitorini Eko Budi Djatmiko Garry Raditya Putra Gde Pradnyana Sutha Gde Pradnyana Sutha, Gde Pradnyana Hadiwidodo, Yoyok Setyo Hadiwidodo, Yoyok Setyo Hafizh Muhammad Naufal Shidqi Hafshah, Nailatul Fadhilah Handayanu Handayanu Handayanu Haryo Dwito Armono Hasan Ikhwani Herman Pratikno, Herman Imam Rochani Kriyo Sambodho Kriyo Sambodho Kurniati, Nani Kurniawan, Ilham Mahmud Mustain Maulinna Kusumo Wardhani, Maulinna Kusumo Miftakh D.S, Dwi Purnomo H, Zuhud Ubaidillah & Muhammad Fajariansyah Ismail Muhammad Nabil Ghiffary Muhammad Zikra Mukhtasor Mukhtasor Mukhtasor, Mukhtasor Mulyadi, Yeyes Murdjito Murdjito Murdjito Murdjito, Murdjito Nahar, Yusapril Hagie Syamsun Norman Mahdar Sabana Noviyanti, Irma Nur Syahroni Nur Syahroni Nurman Firdaus Firdaus Rachmadiarto, Fajar Rahmawati, Shade Rico Firdani Yuzri Rifki Mahardi Rizka Fajri Hamzah Rochani, Imam Rosyid, Daniel Mohammad Rosyid, Daniel Mohammad Sambodho, Kriyo Shade Rahmawati Sholihin Sholihin, Sholihin Silvianita, Silvianita Sony Junianto Sri Sumardiani Sujantoko Sujantoko Syahroni, Nur Syarifuddin, Arief Tito, Brigitta Violyna El WAHYUDI Wimala Lalitya Dhanis Wisnu Wardhana Wisnu Wardhana Yeyes Mulyadi Yeyes Mulyadi Yoyok Setyo Hadiwidodo Yoyok Setyo Hadiwidodo Zikra, Muhammad