Gas Fueled 추진선박의 FGS Room 내 천연가스 누출시 방출특성 및 환기효율성 검토

According to the requirement of Res.MSC.285(86) for natural gas-fueled engine installations in ships, pump and compressor rooms should be fitted with effective mechanical ventilation system of the under pressure type, providing a ventilation capacity of at least 30 air changes per hour. It generally considered that gas leakage is more likely from a FGS room as compared to other places, where installed in many kind of machinery or equipments like gas supply high-pressure pipes, valves, flanges and etc. Furthermore, leaked gas may be dispersed in a short time in an enclosed space, especially a Fueled Gas Supply system Room (FGS), due to high pressure. However, the present requirement in Res.MSC.285(86) just considers the ventilating capacity of air changes per hour but the capacity of leaked gas. Hence, the current requirements may not meet effectively when enforcing the new propulsion systems as marine fuel. This study is conducted for the purpose of safety evaluation about the dispersion and ventilation efficiency, which is installed in a Fueled Gas Supply system (FGS) room of gas fueled ship. Especially, the effect of the exhaust fans placed in the upper chamber is focused in detail. Numerical predictions are performed to know the features of flow pattern and the diffusion of natural gas concentration.