Inžinerijos skaidrės. Lithuanian Maritime Academy. Auxiliary machinery Air compressors. 1-M-16 Name. An air compressor. The main parts of the marine air compressor are. In engine room. These air compressors. To start main engine 2. To start Auxiliary diesel engine(power generation). The role of compressed air onboard is of a very vast nature. Compressed Air System. The compressed air system onboard typically has a set of 4 to 6 compressors. Main air compressors These. Topping-Up air compressors These. Service Air compressors These are general service air compressors.