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All Journal Vokasi: Jurnal Riset Akuntansi Jurnal Teknik dan Manajemen Industri Journal of Engineering and Management in Industrial System Tibuana : Journal of Applied Industrial Engineering International Journal of Marine Engineering Innovation and Research JURNAL POLI-TEKNOLOGI Jurnal Pengabdian Masyarakat Nusantara Jurnal Cakrawala Maritim Jurnal Teknologi Maritim PROCEEDINGS CONFERENCE ON DESIGN AND MANUFACTURE AND ITS APPLICATION
Rina Sandora
Politeknik Perkapalan Negeri Surabaya
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Analysis of time and cost using time cost trade off method in pressure vessel project Sandora, Rina; Lestari, Sri Puji
Tibuana Vol 6 No 2 (2023): Tibuana
Publisher : UNIPA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36456/tibuana.6.2.7757.109-118

Abstract

One of the construction companies got a Pressure Vessel project job. During the process of working on the project, it was delayed from the predetermined date so that the company had to pay a fine of 0.2% every day. So it is necessary to analyze project scheduling in order to get the optimal time and cost of working on this project. The methods used in this research are Time Cost Trade Off (TCTO), Precedence Diagram Method (PDM) and crashing. Acceleration is carried out on all critical paths contained in fabrication activities. This study uses alternatives to accelerate the addition of 50% and 75% labor. The results of this study obtained the optimal time and cost with the alternative of adding 75% labor. The resulting acceleration duration is 75 days faster than the actual duration, with costs incurred of Rp. 161,386,836, -, resulting in a 56% decrease from the actual duration cost of Rp. 286,961,745, -. Analysis of the S-curve found that the accelerated duration can be completed faster than the actual duration because, the curve line on the accelerated duration is more sloping closer to the y-axis indicating greater progress each week.
Analysis of Ovality Deviation of Bending Superheater Tube Boiler Fabrication Process with Six Sigma Method in Manufacturing Company Sandora, Rina; Maulidya, Syirva
Tibuana Vol 7 No 2 (2024): Tibuana
Publisher : UNIPA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36456/tibuana.7.2.9355.98-106

Abstract

Quality control in fabrication is critical to the success of the production process. In this study, key factors in production quality control were identified by analyzing the influence on the tube bending process in fabrication work. Ovality deviations occur during the tube bending process that exceeds 9 percent. 30 boiler superheater tube elements had to go through the repair process. The causes of tube bending deviations were analyzed using the Six Sigma approach with the DMAIC (Define, Measure, Analyze, Improve, and Control) methodology. The causes of failure were analyzed using FMEA, and the highest RPN of 320 was obtained due to design planning and manufacturing of bending dies that are in accordance with the OD tube and the placement of clamp die and pressure die distances that are not too far apart. In addition, an RPN value of 294 was obtained due to the bending speed being too high. The recommendation for the next project is to consider using a C-Frame machine with better control to make it easier for operators to adjust the pressure, temperature, and speed of a good machine to better maintain ovality.
Implementation of Critical Chain Project Management Method on Controlling the Pipeline Project Sandora, Rina; Tridya, Dini Rosyadah
Tibuana Vol 8 No 1 (2025): Tibuana
Publisher : UNIPA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36456/tibuana.8.1.9988.15-21

Abstract

In the implementation of construction projects, the incompatibility between plan and actual schedule that cause an additional time and cost is oftenly occurring. The Pipeline Project started in July 2022 and scheduled for completion in November 2022. However, in actuality the project finished in July 2023. Based on this case, an acceleration method needs to be implemented so that the project can be completed quickly and efficiently. One of the methods applied is Critical Chain Project Management (CCPM). Scheduling is carried out using the actual duration of the project that applied with CCPM. The actual duration of the project is 318 days. Furthermore, by using the CCPM, the duration is become 216 days. So, by using the CCPM, the project is completed 32.08% faster than the actual duration of the project. Based on the results of the analysis, by applying the CCPM method is able to make an optimal duration of the project.
Optimizing Charter Scheme Selection for Coal Transport Vessels Through Capital Budgeting Indicators Sandora, Rina; Hidayatullah, Muhammad Syarif
Tibuana Vol 9 No 1 (2026): Tibuana
Publisher : UNIPA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36456/tibuana.9.1.11124

Abstract

Coal distribution via maritime transport is essential to meeting Indonesia’s national energy demands, creating business opportunities for bulk carrier operators and prompting a financial feasibility study on four investment schemes at a Surabaya-based shipping company: MV. Alpha (owned vessel) and MV. Beta (chartered vessel), each under Voyage Charter and Time Charter contracts. The assessment employs capital budgeting methods—Payback Period (PP), Net Present Value (NPV), and Benefit-Cost Ratio (BCR). Results show that all schemes are financially feasible. MV. Alpha–Voyage Charter records a PP of 4.6 months, NPV of Rp 41.1 billion, and BCR of 1.15, while Time Charter results in PP 7.4 months, NPV Rp 16.5 billion, and BCR 1.11. MV. Beta–Voyage Charter has a PP of 12.1 months, NPV Rp 15.3 billion, and BCR 1.03; whereas Time Charter achieves PP 5.3 months, NPV Rp 44.4 billion, and BCR 1.09. Incremental analysis reveals that MV. Alpha–Voyage Charter yields an incremental benefit of Rp 147.8 billion over Time Charter with an additional cost of Rp 123.2 billion, resulting in an incremental BCR of 1.20. For MV. Beta, Voyage Charter incurs Rp 29 billion in extra costs without added benefits, producing an incremental BCR of 0, making Time Charter the more efficient option.
Co-Authors - Hwihanus Abdul Halik Adi Wirawan Husodo Amelia Laksmi Andani Devi Novitasari Anggrik Dwi Merari Anisya Kusumaningrum Azura, Talitha Cornelia Benedicta Dian Alfanda Benedita Dian Alfanda Budi Prasojo, Budi Budianto . Budiyanto, Ekky Nur Ceke Dwi Octa S.P. Dewi Kurniasih Dewi Kurniasih Diajeng Rizky Amelia Dianita Wardani Dioktyanto, Mudzakkir Ekky Nur Budiyanto Eko Julianto Endang Pudji P. Endang Pudji Purwanti Farizi Rachman Fitri Annisa Galih Anindita Kartika Agustin Nirmalasari Kartika Indira Putri Khoiriyah, Lilik Laras Gayuh Kartika Wulan Lestari, Rahandini Lukita Mahardhika, Pekik Maulidya, Syirva Megawati Fratiwi Mochamad Luqman Ashari Mochamad Yusuf Santoso Muhammad Fiky Izzulhaq Muhammad Syarif Hidayatullah, Muhammad Syarif Muhammat Junaidi Muzakky, Chezta Ahmad Niko Aditya Ni’matut Tamimah Novitasari, Andani Devi Pekik Mahardhika Primaningtyas, Widya Emilia Pusparani, Vena Rizky Putra, Fani Sandy Putri, Gilang Armanda R.A. Norromadani Y RA Norromadani Yuniati RA. Norromadani Yuniati Rahandini Lukita Lestari Rahmahwati, Intan Regita Palupi Renanda Nia Rachmadita Renanda Nia Rachmadita Reza, Muhammad Ali Rinda Fitriana Rudy Suryadi, Rudy Siti Mujanah Sofia, Emy Sri Puji Lestari Sri Puji Lestari Syahdewa, Budi Indra Tarikh Azis Ramadani Thina Ardliana Tri Andi Setiawan Tridya, Dini Rosyadah Wismawati, Endah Yesica Novrita Devi