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This Author published in this journals
All Journal IJOCE (International Journal of Offshore and Coastal Engineering) International Journal of Marine Engineering Innovation and Research
Rosyid, Daniel Mohammad
Institut Teknologi Sepuluh Nopember
Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Scheduling and Network Analysis on Cooling Water Pipe Fabrication Project Rizky, Ekky; Silvianita, Silvianita; Rosyid, Daniel Mohammad
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.
Jacket Structure Design Optimization to Reach Minimum Construction Cost Sumardi, Aufar Syahmi Fariz; Rosyid, Daniel Mohammad
International Journal of Marine Engineering Innovation and Research Vol 10, No 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.22293

Abstract

Offshore jacket structures are essential components in platform construction, requiring optimization due to high material, fabrication, and coating costs. The objective of this research is to achieve cost-effective designs without compromising safety. The methodology employs Sequential Quadratic Programming (SQP) with a surrogate-based approach to optimize structural dimensions, while reliability is assessed using Monte Carlo Simulation to account for uncertainties. Optimization conducted in MATLAB resulted in significant improvements in the dimensional reduction of most design variables, including a 20.32% reduction in total construction costs. Material, fabrication, and coating costs decreased by 19.05%, 28.11%, and 6.14%, respectively. The reliability index (?) of critical members improved to a range of 3.12–3.29, exceeding the safety threshold of 3.09.
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 Rizky, Ekky Rudi Walujo Prastianto Silvianita, Silvianita Sumardi, Aufar Syahmi Fariz Tito, Brigitta Violyna El