Low-speed diesel engines refer to less than 300 rpm. Since it is a low-speed diesel engine for marine use, it is of course used for ships. If it is a large-scale marine low-speed main-use diesel engine, there is often no separate auxiliary system, such as a complicated and huge fuel system. The oil system, as well as the starting system for starting the diesel engine, such as compressed air. The compressed air has a set of air compressors, as well as a booster system... I say that the large diesel engine is not alone. Existence, so its use is also greatly limited! Special marine diesel engines, due to shipbuilding regulations and some requirements, its requirements and cost are very high. So generally only for ships. Small ships often do not use low-speed machines Because small ships have good maneuverability and small load capacity, they generally do not adopt such low-speed machine high-power diesel engines. Therefore, low-speed marine diesel engines have great limitations in addition to marine use in other industries.