Friday, November 26, 2010

What is a Marine Fresh Water Generator?

"Water, water everywhere, and nary a drop to drink." Old cargo ships from years back were required to carry large supplies of fresh water to sustain the crew on a long voyage. A ship that had run out of drinking water would be carrying a sad crew indeed. Today, most commercial ships are equipped with a freshwater generator, a type of evaporator that converts sea water into drinkable, fresh water.

The concept of a freshwater generator is simple; sea water is evaporated using a heat source,either by stream from the boiler, main engine jacket cooling water, or by electric coil separating pure water from salt, sediment and other elements. When the ship is underway, the heat from the cooling water of the engine is used. To minimize fuel consumption and maximize the heat generated by the main propulsion engine.
There are two main elements in a freshwater generator, one heat exchanger evaporates the sea water, and another condenses the fresh water vapor into drinking water. In the condenser element, the vapor is condensed through cooling, often simply using cold seawater to cool the outside of the unit.

The freshwater generator should include a feature to monitor the salinity of the processed water. If the salinity exceeds a specified level, usually between one and ten parts per million (ppm), the freshwater generator will automatically return the water to the feed line and put it through the cycle again.


  1. Hi,

    Nice marine fresh water generator, you can get fresh and cleaned water in sea. It is most important for the people those work for a long days in ship. Thanks a lot.

    Water Treatment

  2. It is helpful to minimize fuel consumption and maximize the heat generated, This is great...

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