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All Journal Jurnal Teknik ITS IJOCE (International Journal of Offshore and Coastal Engineering)
Silvianita Silvianita
Institut Teknologi Sepuluh Nopember
Engineering

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Pushover Analysis Pile of ULA Jacket Platform Towards Earthquake Loads by SNI-1726:2012 Dirta Marina Chamelia; Alim Bagus Prakoso; Silvianita Silvianita
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 1 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (855.063 KB) | DOI: 10.12962/j2580-0914.v1i1.2875

Abstract

This study aims at analyzing pushover on pile jacket structure based on SNI-1726:2012 standards for earthquake loads. Push­over analysis or ultimate strength was performed on ULA jacket plat­form operated by PHE ONWJ. The jacket platform is operated in the northwestern part of the Java Sea. Design of earthquake loads on ULA jacket platform structure with large seismic accele­ration was obtained. From seismic analysis, dynamic response occurred on ULA jacket platform is evaluated, with natural struc­ture period of 1.256 seconds. The largest shear base values were in X and Y directions resulted from seismic acceleration of PGA 0.2g. On member check, the critical part happens to be one of the members of WD2, and on joint check, the largest UC occurred on 401L joint, both were due to the aforementioned earth quake ace­leration. Pushover analysis was then performed to obtain the value of RSR (Reserve Strength Ratio). The analysis yields an RSR value which far exceed the limiting criteria of API RP 2A WSD of RSR ≥ 0.8. Therefore it could be concluded that ULA jacket platform structure is within the range of low consequence category.
Analysis of the Impact of COVID-19 Pandemic on Trade and Economy of the Coastal Communities of Kenjeran Village, Surabaya Using the Fault Tree Analysis (FTA) Method Hario Bagoes Wirandoro; Widi Agoes Pratikto; Silvianita Silvianita
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 1 (2022)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.14557

Abstract

The coastal area as a densely populated area with high socioeconomic activity is currently experiencing impacts in various sectors due to the COVID-19 virus outbreak. However, the efforts to minimize the impact of the pandemic are still general and have not taken consider the conditions of communities in coastal areas. This analysis aims to determine the factors that cause the coastal community of Kenjeran to experience a decline and a decrease in trade and economic activity and identify the probability during the COVID-19 pandemic. The method used in this analysis is Fault Tree Analysis (FTA). The result shows that the main factors causing the decline are decreased fish sales, decreased community income, decreased activity at sea, and decreased activity of traders in the market with the probability factor of 0.2494 or 24%. Mitigation recommendations for the coastal community of Kenjeran Beach are a collaboration between the fishers and the policy of cooperation between the trade office and the marine service to conduct clustering for fishers so that they can supply scarcity of marine fish and limited marine product, also monitoring the health protocols with the swab and rapid tests for traders by permanent health service
Risk Analysis of the Impact of Pandemic COVID-19 on the Health and Economy of Fishery Households in Kedung Cowek Village, Bulak, Surabaya Mohammad Hadiyan Ghafara; Widi Agoes Pratikto; Silvianita Silvianita
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 1 (2022)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.14552

Abstract

Since the COVID-19 pandemic hit Indonesia, many fishery households on Indonesia's coast have been affected. Therefore, an analysis of the impact of the COVID-19 pandemic was carried out on the health and economy of fisheries households in the coastal areas of Kenjeran Beach, especially in Kedung Cowek Village, Bulak, Surabaya. The Fault Tree Analysis (FTA) method is used to find the probability of decreasing fisheries household welfare and the Event Tree Analysis (ETA) to find the level of risk for each factor causing the decline in the welfare of fishery households. The analysis result shows that 21 factors cause household welfare in Kenjeran Beach to decline, grouped into two intermediate events: decreasing fisheries household income and decreasing fishery household health. The probability of fishery household welfare decreases by 0.0171212. Decreasing welfare of fisheries households has a risk that fisheries household income will not experience a decrease in income, and there is no spread of COVID19, with a risk probability of 0.0052 and having a medium risk index level. Based on this, stakeholders in the income and health of fisheries households such as the government, analytical institutions, and households have a role in mitigating the impact of COVID-19.
Scheduling and Network Analysis on Cooling Water Pipe Fabrication Project Ekky Rizky; Silvianita Silvianita; Daniel Mohammad Rosyid
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 1 (2022)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.14554

Abstract

Optimizing costs and time and manpower planning are very important in project management. The case study raised in this research is a cooling water pipe fabrication project with a processing time duration of 231 days and a project cost allocation of Rp. 306,545,488,000. The method used to control project delays is earned value analysis, and to optimize the project is done by shortening the project duration and minimizing project cost losses using the crash program method. The results of the earned value analysis stated that the project experienced delays, exceeded budget costs and was subject to project delays penalties, which was 340 days of completion time more than 111 days from the planned time and with a total final project cost of Rp.331,813,410,524.46 more than Rp. 25,267,922,524.44 of the costs that have been prepared. Then an effort was made to accelerate the duration of the project with three scenario options. From the results of the crash cost calculation, it is found that the final total cost estimate for scenario 1 with 3 hours overtime is Rp.289,043,553,541. Scenario 2, the estimated total final cost with 4 hours overtime is Rp.289,051,063,021 and scenario 3 the estimated total final cost with the addition of workers is Rp. 289,310.359,861. So, the scenario that can be used by PT. X in order to minimize losses is to impose 3 hours overtime with an estimated total final cost of Rp.289,043,553,541.
Penilaian Resiko Kerusakan Pipa Bawah Laut Milik PT. Perusahaan Gas Negara di Labuhan Maringgai-Muara Bekasi Akibat Kejatuhan Jangkar Menggunakan Metode Monte Carlo Jadidah Fihriz Nanda; Wimala Lalitya Dhanistha; Silvianita Silvianita
Jurnal Teknik ITS Vol 11, No 2 (2022)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v11i2.88798

Abstract

Kebutuhan akan produksi minyak dan gas bumi semakin hari semakin tinggi. Untuk itu dalam memenuhi permintaan tersebut perlu adanya alat transmisi minyak dan gas bumi yang memadai serta aman agar proses distribusi berjalan dengan lancar. Pipa bawah laut adalah faktor penting dalam proses transmisi migas. Namun dalam prosesnya banyak sekali resiko kecelakaan yang bisa terjadi terhadap pipa bawah laut seperti contohnya terkena jatuhan jangkar atau drop anchor. Pada tugas akhir ini dilakukan analisis resiko kerusakan terhadap pipa bawah laut milik PT. Perusahaan Gas Negara yang diakibatkan oleh penurunan jangkar. Lokasi pipa ini ialah di labuhan maringgai-muara Bekasi. Untuk mendapatkan besarnya konsekuensi resiko yang bisa terjadi pada pipa digunakan software ANSYS dan simulasi monte carlo. Dari perhtitungan yang telah dilakukan maka didapatkan bahwa jangkar dengan berat 1140 Kg, 1200 Kg dan 1290 Kg masing-masing memiliki gaya sebesar 31950 N, 35480 N dan 41103 N. Setelah dilakukan simulasi dari berat jangkar tersebut maka didaptkan hasil bahwa ketika jangkar dengan berat 1140 Kg dan 1200 Kg jatuh dan mengenai badan pipa, maka pipa tersebut berada di zona ALARP. Sedangkan jangkar dengan berat 1290 Kg ketika jatuh dan mengenai badan pipa, maka pipa tersebut berada di zona Unacceptable risk.
Analisis Risiko Kecelakaan Kerja pada Proses Loadout Topside dan Jacket Structure Menggunakan Self-Propelled Modular Transporter (SPMT) Fadilah Afif Anugrah; Wimala Lalitya Dhanistha; Silvianita Silvianita
Jurnal Teknik ITS Vol 11, No 3 (2022)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v11i3.90680

Abstract

Setiap pelaksanaan proyek dapat terjadi kecelakaan kerja yang mengakibatkan cedera maupun kerugian lainnya. Salah satu proyek yang berpotensi dapat terjadinya kecelakaan kerja yaitu pada proyek loadout jacket dan topside structure. Upaya yang dapat dilakukan untuk meminimalisir atau menghilangkang potensi terjadinya risiko yaitu dengan membuat sebuah sistem manajemen risiko kecelakaan kerja. Oleh sebab itu pada penelitian ini penulis menganalisis risiko kecelakaan kerja pada proses loadout topside dan jacket structure menggunakan SPMT. Tujuan dari penelitian ini adalah untuk mengetahui variabel bahaya dominan pada proses loadout jacket dan topside structure menggunakan SPMT, mengetahui penyebab dan akibat dari variabel bahaya dominan, serta mengetahui faktor eskalasi yang dapat mengaruhi efektivitas pada langkah mitigasi dan preventif. Penelitian dimulai dengan identifikasi bahaya dan divalidasi dengan metode berdiskusi bersama stakeholder yang berpengalaman di bidang loadout. Kemudian dilakukan penyebaran kuesioner untuk mendapatkan nilai severity dan likelihood kepada 5 expert judgement. Hasil dari penyebaran kuesioner tersebut dilanjutkan dengan metode HIRA yang dibantu dengan matriks risiko untuk menentukan kategori dari tiap variabel bahaya. Sehingga hasil dari penelitian ini dapat diketahui variabel bahaya yang dominan yaitu pekerja terjatuh ke dalam mainholles dan SPMT berjalan di luar dari rencana. Selanjutnya kedua variabel bahaya tersebut di analisis menggunakan metode bow tie analysis untuk mengurangi potensi terjadinya bahaya yang dominan atau ekstrim.
Co-Authors Alim Bagus Prakoso Dirta Marina Chamelia Ekky Rizky Fadilah Afif Anugrah Hario Bagoes Wirandoro Jadidah Fihriz Nanda Mohammad Hadiyan Ghafara Rosyid, Daniel Mohammad Widi Agoes Pratikto Wimala Lalitya Dhanistha