A marine reduction and reverse gear comprises a communication passage (309) extending from a hydraulic oil passage (210a), which is between a forward-reverse selector valve (206) and a hydraulic pump (202), to a lubricating oil passage (303a). A piping passage (307e) for detecting the hydraulic pressure in the hydraulic oil passage (210a) and a piping passage (307f) for detecting the hydraulic pressure in the lubricating oil passage are connected to a source pressure distribution plate (51).

A water desalination system comprising an evaporator for evaporating saline water to produce water vapor; a condenser for condensing the water vapor; wherein the evaporator and the condenser are in heat transfer communication such that heat used by the evaporator is at least in part derived from the condenser.

The invention relates toa machinery arrangement,which comprisesa combus- tion unit (3) arranged in an engine room (11), and an exhaust gas duct assem- bly (4) connected to the combustion unit (3) for receiving an exhaust gas flow and for leading the exhaust gas flow to the atmosphere through an exhaust gas cleaning system (5) provided with an exhaust gas pipe (52).

The invention relates to an operating unit for nautical use, wherein an internal combustion engine drives an electric energy generator. According to the invention, the generator is cooled by oil in which the rotor and the stator are partly immersed: the spinning motion of the rotor drags the oil into the air gap, thus cooling the stator as well.

A vessel-based system and method for disposing of wastewater including bilge water from a bilge of the vessel. The system comprising a treatment unit for receiving and treating the wastewater to produce a substantially oil-free treated water and, an evaporator for receiving the treated water from the treatment unit. The evaporator comprising an evaporation element for transferring heat to the treated water to evaporate the treated water.

A command value is inputted to a controller (4) which is connected with a maneuvering gear (6) operated by an operator. A rotation speed detector (8) detects the rotation speed of an engine (2), and sends it to the controller (4) connected with an indicator (10). The maneuvering gear (6) and the controller (4) are connected by multiple wiring lines, and a wiring detector for detecting the communicating states of the individual wiring lines is disposed in the maneuvering gear (6).

The invention relates to a device for conditioning a boat, comprising a cooling heat exchanger (12) and a heating heat exchanger (10) that can have an air flow (14) flowing successively through them, wherein the heating heat exchanger is connected via a water loop (16) to a heater (18) operated with a fuel and the cooling heat exchanger is designed as an evaporator of an air conditioning system (20). The invention further relates to a method for conditioning a boat.

An air conditioner in a ship's cabin, which air conditioner can reliably air condition the cabin by a simple structure, can be installed at low cost, and can be easily maintained.

An ammonia absorption type refrigerating apparatus utilizing waste heat of exhaust, which consists of an ammonia solution circulation loop and an ammonia circulation loop, includes a waste heat generator (1), a finestiller (5), a regenerator (3), a solution throttle valve (4), ammonia throttle valves (11, 13), an evaporator (15), a solution pump (9), an absorber (8), a condenser (10), a generation-absorption heat exchanger (7) and an over cooler (12).

[PROBLEMS] To provide a method of membrane treatment for ballast water, in which fouling substances derived from mineral components and gelatinous substances adhering to membrane can be securely removed by detachment or decomposition to thereby attain prolonged maintenance of membrane flux.