LEE- Açık Deniz Mühendisliği Lisansüstü Programı

Bu topluluk için Kalıcı Uri

http://hdl.handle.net/11527/19186

Gözat

Yazar "Menteş, Ayhan" ile LEE- Açık Deniz Mühendisliği Lisansüstü Programı'a göz atma
  • Öge
    Comprehensive assessment of rov systems: An effective approach to analysis of ROV system mobilization risks
    (Graduate School, 2023-06-12) Asgarov, Gurban ; Menteş, Ayhan ; 508191238 ; Offshore Engineering
    Remote Operating Vehicles (ROVs) are sophisticated underwater robots that play a vital role in various industries such as deep-sea exploration, oil and gas operations, underwater construction, and scientific research. These ROV systems consist of several components, including the ROV itself, Launch and Recovery Systems (LARS), umbilical cables, tethers, and power generators. Due to their complexity, it is crucial to conduct a thorough risk analysis to identify and mitigate potential hazards associated with ROV operations. This study specifically focuses on the mobilization phase of ROV systems, which involves preparing and deploying the underwater robots. During mobilization, numerous risks can arise, including mechanical or technical failures during transportation, damage to the ROV or its components during handling, and delays or disruptions caused by adverse weather conditions or logistical issues. Safeguarding against these risks is paramount to ensure the safe and successful operation of ROVs. To assess the risks involved in the mobilization process, two hybrid approaches are employed in this study. Both methods utilize the Ordered Weighted Geometric Average (OWGA) for weight distribution in terms of Severity, Detection, and Occurrence. In addition, Multi-Objective Optimization on the Basis of Ratio Analysis (MOORA) and Multi-Objective Optimization on the Basis of Simple Ratio Analysis (MOOSRA) are utilized in calculating the Risk Priority Number (RPN). These approaches aim to provide a comprehensive evaluation of the risks associated with ROV mobilization, taking into account various factors and expert opinions. By utilizing these hybrid methodologies, operators and stakeholders can gain a better understanding of the potential risks involved and make informed decisions to mitigate them effectively. In conclusion, the analysis of risks in ROV systems, particularly during the mobilization phase, is crucial for ensuring safe and successful operations. By employing hybrid approaches and incorporating expert opinions, this study aims to enhance risk assessment capabilities and facilitate the implementation of effective risk mitigation strategies in the field of underwater robotics.
  • Öge
    Determination of greenhouse gas emissions; Case study for a turkish marine technology company
    (Graduate School, 2024-10-25) Balçık, Yasir Numan ; Menteş, Ayhan ; 508211217 ; Offshore Engineering
    Global warming poses serious risks both today and in the future. The increase in global temperature poses serious problems such as climate change, sea level rise, ecosystem degradation, decrease in agricultural productivity, and depletion of water resources. The increase in human-induced greenhouse gases forms the basis of global warming. As a result of the growing concern about greenhouse gas emissions (GHG), international initiatives to control and take measures in this area are increasing and gaining importance. In addition to the obligations imposed by international deposits, businesses also have social responsibilities to ensure a sustainable future. In this context, carbon footprint assessments are one of the most important tools for switching to more environmentally friendly operations. As an energy-intensive sector, the maritime industry causes important amounts of air emissions, particularly GHGs. Most of the research on GHG reduction from shipping focuses on reducing emissions during the operational phase. However, as emissions during ship operations are reduced, ships' construction, dismantling, and maritime technology generation phases become increasingly important. This thesis includes carbon emissions and calculations from a maritime organization and its activities. It is within the scope of the thesis to determine the standards and methods used in calculations by processing the corporate carbon footprint. The case study conducted for a marine technology company operating in Türkiye aims to set an example in determining the carbon footprint, contribute to the sustainability performance of the sector by examining the environmental impacts of maritime companies, and guide future studies. Within the scope of the research, in order to calculate the corporate carbon footprint (CF) according to the criterias specified in the GHG Protocol and ISO 14064, firstly, the activity boundaries are determined by determining information such as the use of transport vehicles, the types of energy used and the wastes generated. Scope-1, Scope-2, and Scope-3 emission sources are classified. After these emission sources are identified, the necessary data are obtained from the maritime technologies enterprise to calculate the carbon footprint. Emission factors published in the Department for Environment, Food and Rural Affairs (DEFRA) notifications are included in the data pool. Corporate carbon footprint calculation is carried out by multiplying the data obtained from the maritime technologies enterprise with the relevant emission factors and obtaining emission data in terms of carbon dioxide equivalent (CO2e) according to the activities. In the study, direct and indirect emissions of the maritime technologies business are calculated within the determined operational limits. As a result of the calculations made, the scope I emissions of the examined facility are determined as 85,791 tons of CO2e, mainly from mobile combustion, scope II emissions from purchased electricity are determined as 51,455 tons of CO2e, while scope III emissions, which are mostly not included in scope I sources and are indirectly caused by fuel consumption, are determined as 42,079 tons CO2e. According to these results, the total greenhouse gas emission of the marine technologies enterprise examined within the scope of the study is 179,325 tons of CO2e according to 2023 data. In the study, it is observed that 47.86% of the total greenhouse gas emissions are Scope I emissions, 28.69% are Scope II emissions and 23.46% are Scope III emissions. The results will provide a comprehensive overview of the facility's carbon emissions from various sources and help identify key areas for potential reductions in GHG emissions. According to the results of the carbon footprinting for the maritime technologies business enterprise, strategies that can be followed according to emission sources in all three scopes to reduce greenhouse gas emissions are shared. The data obtained provide a critical basis for understanding the environmental impacts of various aspects of maritime activities. These results will contribute to guiding the sustainability efforts of maritime businesses and their commitment to leaving a cleaner environment for future generations. Future studies will have an important role in monitoring the effectiveness of these measures and continuously improving the environmental performance of the maritime business.