新版轮机英语unit6STARTINGSYSTEM.ppt

Master valve (automatic valve)Non-return valveIn an attempt toDesign features and working principleTwo air compressors, with automatic（自动的）（自动的） start and stop , maintain a starting air of 30 bar in the starting air receivers.The main engine is supplied with 30 bar starting air directly from the starting air receivers. Through a pressure reduction station（减压装置）（减压装置）, compressed air at 7 bar is supplied as control air for the engine maneuvering system（操纵系统）（操纵系统）, and as safety air for the emergency system.Starting air and control air for the auxiliary engine (s) is also supplied from the same starting air receivers, via reducing valves（减压阀）（减压阀） that lower the pressure to a valve suited to the actual type of MAN B&W four stroke auxiliary engines chosen.An emergency air compressor and a starting air bottle are installed for redundant（冗余的）（冗余的） emergency start of the auxiliary engines.If high humidity air is sucked in by the air compressors, an oil and water separator will remove moisture（湿气）（湿气） drops（滴）（滴） present in the 30 bar compressed air.When the pressure is subsequently reduced to 7 bar, as for the main engine maneuvering system, the humidity（湿度）（湿度） in the compressed air will be very slight. Consequently（因此）（因此）, further air drying is considered unnecessary.