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IJOCE (International Journal of Offshore and Coastal Engineering)
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : -     EISSN : 25800914     DOI : -
Core Subject : Engineering,
Engineering
IJOCE, International Journal of Offshore and Coastal Engineering, is an academic journal on the issues related to offshore, coastal and ship science, engineering and technology. Published quarterly in February, May, August, and November.
Arjuna Subject : -
Articles 202 Documents
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Scheduling and Network Analysis on Cooling Water Pipe Fabrication Project Silvianita Silvianita; Daniel Mohammad Rosyid; Ekky Rizky
International Journal of Offshore and Coastal Engineering Vol. 6 No. 1 (2022)
Publisher : Department of Ocean Engineering

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.
Comparative Analysis of GTAW, GMAW, and FCAW Welding Results on A36 Steel Against Tensile Test and Macrostructure Herman Pratikno; Wimala Lalitya Dhanista; Hafizh Abiyyuda
International Journal of Offshore and Coastal Engineering Vol. 6 No. 1 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.14555

Abstract

Offshore building construction is inseparable from the fabrication process. Fabrication process that has an important role in terms of engineering, material repair and welding process. In offshore building construction, a precise welding method is needed on A36, where A36 steel is one of the main materials in the fabrication process of offshore buildings. In this study a comparison of welding results of GTAW, GMAW, and FCAW on A36 steel against Tensile Test and Macrostructure Test. The results of this research show that the best tensile test results are the GTAW welding method with an average value of ultimate strength of 462,168 MPa. Macrostructure testing which has the widest HAZ width is the GTAW welding method of 18,71 mm.
Gorlov Water Turbine Application in Ambon, Kepulauan Maluku; A Hypothetical Project Wisnu Wardhana; Shade Rahmawati; Dendy Satrio; Zahra Aisyiyah Rahayu
International Journal of Offshore and Coastal Engineering Vol. 6 No. 1 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.14556

Abstract

As energy demand increases, it must be balanced with sufficient energy sources to support the growth of Indonesia's electrification ratio. No exception with the development of energy demand and supply on Ambon, Maluku Islands. This study uses a Renewable Energy Power Plant, a water turbine that uses ocean currents from the flow path of an artificial canal plan in Ambon, Maluku Islands. The shape of the area is interesting things to make an artificial canal as a flow path for ocean currents from the different height at that location. Due to the height difference cannot be determined with certainty, in this study, the authors vary the height difference between the sea in the east and west, it's 1m to 5m. Current modelling uses a numerical approach using the Surface-Water Modeling System (SMS) 8.1 software simulation. Then the average current velocity in the canal in each height variation obtained. The experimental data from journal references are used in calculating the turbine torque for a full-scale afterwards adjusted to the current speed generated in each variation. The turbine with the greatest torque is selected, owned by the 4-blades Gorlov NACA0012 with 25% efficiency and 9.5m turbine diameter totalling 1 unit
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 Widi Agoes Pratikto; Silvianita Silvianita; Hario Bagoes Wirandoro
International Journal of Offshore and Coastal Engineering Vol. 6 No. 1 (2022)
Publisher : Department of Ocean Engineering

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
Effect of Preheating Process and V Groove Type on the Tensile and Metallography Test of ASTM A53 with A36 Weld Joint Using FCAW Method Herman Pratikno; Wimala Lalitya Dhanista; Abdullah Husin Baredwan
International Journal of Offshore and Coastal Engineering Vol. 6 No. 2 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i2.14769

Abstract

Steel is a metal material that is often used in the maritime industry due to its availability and weldability. ASTM A53 steel is a low carbon steel commonly used for piping applications. ASTM A36 steel is a low carbon steel commonly used for offshore buildings. This study aims to determine the influence of preheat temperature and V groove type on bend resistance of A53 and A36 weld joint using FCAW (Flux Cored Arc Welding) method. The preheat temperature used are 100°C and 150°C with groove type variations used were single V groove and double V groove. The type of protective gas used is 100% CO2. The results of tensile strength test showed that in the welding process in this study, specimen with preheat temperature of 150°C and double V-Groove shape has the strongest tensile strength, with HAZ width of 3.91 mm, ferrite phase percentage of 58.08%, and pearlite phase percentage of 41.92%.
Micro Wave Energy Farming on Slender Pile Structure Shade Rahmawati; Haryo Dwito Armono; Faliha Husna
International Journal of Offshore and Coastal Engineering Vol. 6 No. 2 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i2.14770

Abstract

The development of renewable energy technology has mostly beenfocused on macro-sized farming models. Recent studies have explored the benefits of micro wave energy to support offshore sensor networks. This paper discusses the viability of micro ocean energy farming of wave energy on slender pile structure through piezoelectric converters. Case study was obtained using Tuban environmental data from the year 2004-2009. Significant wave height and period were used to generate wave forces on slender pile and converted to electrical energy using simple piezoelectric converter equations. The resulting wave force on a 0.03m thick piezoelectric plate generates voltage of 0.6 Volt.
The Effect of Addition of Mangrove Avicennia Marina Extract on The Biofouling Activity to Epoxy Coating Herman Pratikno; Dwi Maharani Aisyah; Harmin Sulistiyaning Titah
International Journal of Offshore and Coastal Engineering Vol. 6 No. 2 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i2.15609

Abstract

Biofouling is one of the problems related to construction maintenance in industrial developments in the maritime construction sector because biofouling adhesion can affect construction productivity. This problem can be overcome by coating using natural-based paints to reduce the ecological impact that will occur. This study aims to determine the effect of the addition of Avicennia marina mangrove extract as an anti-fouling compound mixed with epoxy paint. This research was conducted by mixing Avicennia marina mangrove extract with epoxy paint. Then the alloy is applied as a coating on the ASTM A36 steel specimen. Furthermore, the test was carried out by immersing the specimen in a solution containing Littorina littorea as a biofouling biota. The average results of the biofouling affixing activity test with the addition of mangrove extract concentrations of 0%, 10%, 20%, and 30% were respectively 24.0 gr, 20.5 gr, 13.5 gr, and 6 gr. This test shows that the more the addition of mangrove extracts, the smaller the adhering activity of biofouling to the specimen.
Hydrodynamic Performance Analysis of Vertical Axis Water Turbine (VAWT) Gorlov Type With Hydrofoil Thickness and Inclination Angle Variables using Computational Fluid Dynamics (CFD) Approaches Wisnu Wardhana; Shade Rahmawati; Dendy Satrio; Annisa Nurliana
International Journal of Offshore and Coastal Engineering Vol. 6 No. 2 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i2.14771

Abstract

The issue of renewable and eco-friendly energy has become the focus of research in several countries to encourage eco-friendly alternative energy. One of them is by using turbines to produce electrical energy. Vertical Axis Water Turbine (VAWT) can be an exciting research object because it has various advantages. VAWT has a simpler structure, can move at relatively slow currents and is famous for its tendency to move regardless of the water flowdirections. In this study, the experimental turbine from secondary data numerically simulates using the Computational Fluid Dynamics (CFD) method with the help of ANSYS V18.1 software. The Gorlov turbine model is manufactured in 3 dimensions under steady-state flow conditions. Validation is carried out after obtained numerical results with the mean error rate being less than 10%. The variables in this research are the thickness of hydrofoil using NACA 0010, NACA 0016, NACA 0020, and variations in inclination angle of the blade for 25. After comparing the simulation results in the form of torque values is done, it is shown that the best turbine performance is given by water turbine using NACA 0016 with 60 and 60 of inclination angle.
Saddle Strength Analysis on Jacket Structure During Roll Up Procedures in Fabrication Phase Handayanu Handayanu; Nur Syahroni; Nabila Defriana
International Journal of Offshore and Coastal Engineering Vol. 6 No. 2 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i2.14772

Abstract

Offshore platform is a structure that serves as a well drilling facility to explore, extract, store and process petroleum and gas located under the seabed. There are several phases in theconstruction of offshore structures (fixed jacket platform) from preparation to construction. Fabrication phase is the earliest stage in the manufacture of a fixed offshore platform (jacketstructure) which is carried out by the fabricator. One of the procedures at the fabrication phase is roll up procedure. In this final project research, an analysis will be carried out regarding the configuration of the rigging, crane, and sadle support used in the jacket structure during roll up procedure. After the analysis of jacket structure modeling using the SACS software, the results of rigging configuration can be obtained, which were the slingsspesifications used to connect the structure with cranes, with sling diameter of 2.75 inch and SWL value of 64 MT. As for the sling used to connect the jacket with winch has a diameter of 1.5 inch snd SWL value of 18 MT. Furthermore, the cranes used have a capacity of 75 and 78 MT, respectively. In the load analysis of the jacket structure, it was found that saddle support received the largest reaction when the jacket was at an 80-degree slope with the largest reaction value of 102.74 MT. In the saddle support local analysis, the result of maximum equivalent von-mises stress obtained was 43,486 MPa, with the saddle allowable stress of 345 Mpa, therefore the UC value of 0.24 can be obtained.
Experimental Study of Electrode Variation Effect on Connection Strength for Underwater Welding Nur Syahroni; Yeyes Mulyadi; Benedictus Arif Wicaksono
International Journal of Offshore and Coastal Engineering Vol. 6 No. 2 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i2.14773

Abstract

SMAW welding has various electrodes that can be used in underwater welding. This study will analyze the influence of electrode type on mechanical properties and the influence ofwelding position on the mechanical properties of joints for underwater welding. This experiment results show that the E7016 electrode pull test has a superior value than the E6013 and E7018 electrodes; when compared between E6013 and E7016, it is reasonable if the E7016 is stronger than E6013 and the frequency level is higher than E6013 even if it already uses a different amper. However, if the E7016 electrode compared to the E7018 is still superior to the E7016 electrode using the same voltage and amper. In addition, the results of macro test observations show that welding using the E7018 electrode has lower porosity levels than E7016 electrodes, while with the same experiment results, the tensile strength of the E7016 is superior to the E7018. So that the power value of E7016 electrodes can be superior to E7018 in this experiment is not only based on porosity that occurs but also slag and imperfect penetration also determines the strength of welding results by using E7016 electrodes.

Page 16 of 21 | Total Record : 202

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