Feasibility Study on Using Seawater in Ship Pressure Water Mist Fire Extinguishing System Fire is the most deadly type of ship safety accident, because ship fires are generally accompanied by bad sea conditions due to their poor fighting conditions, and the shipxe2x80x99s engine room environment has more oil and gas, and the equipment layout is chaotic and the space is narrow. Once a fire is fired, it is more difficult and dangerous. Therefore, ship fires are also regarded as one of the most difficult fires to extinguish. In this paper, the feasibility of using seawater in the shipxe2x80x99s pressurized water mist fire extinguishing system is studied. The feasibility of seawater fog fire extinguishing is explored through the characteristics of ship water pressure and water mist. From the experimental results, it can be seen that seawater fog is used in ship fire fighting. The obvious effect is therefore that it is feasible to use seawater to extinguish the shipxe2x80x99s pressure water mist fire extinguishing system.

Fire Fighting Tactics with Aerial Hosetype Robot xe2x80x9cDragon Firefighterxe2x80x9d We herein propose the method for developing an xe2x80x9caerial hose type robotxe2x80x9d called the xe2x80x9cDragon Firefighter (DFF)xe2x80x9d that can fly along with the water jet. We focus on realizing a novel concept through which obstacles can be avoided and fire spots can be accessed from a distance, thereby enabling direct firefighting, and evaluating fire suppression ability from a close distance of fire source for practical useage. Using robotics, we aim to extinguish the fire from a distance, simultaneously guaranteeing firefightersu0027 safety. We were able to realize stable floating of a hose of length 2.8 m (total length of 3.6 m), which is twice that of a conventional one, overcoming the height gap of approximately 1.5 m and the size of frontage  mathbf1.0 times mathbf2.5 mathbfm . We demonstrated a fire extinguishing, however the ability of fire extinguishing about DFF was unknown. Hence, we conducted a mist spray experiment from a close distance to validate the cooling effect of water. Considering the aerial nature of our robot, we concluded that a mist spray from its nozzle module will be more effective for extinguishing fires. Finally, we presented the consideration of firefighting tactics using the proposed DFF for practical implementation.