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The document discusses air compressors used onboard ships. It defines an air compressor as a mechanical device that increases the pressure of air by reducing its volume. It then classifies air compressors based on factors like number of stages, drive mechanism, cooling method, and cylinder arrangement. The document outlines common uses of compressed air onboard ships like starting main engines and auxiliary engines. It also discusses key components of air compressor systems like valves, safety devices, and air receivers.



















