required fresh water for a vessel?

Discussion in 'Education' started by SeaBoat, Sep 21, 2020.

  1. RAraujo
    Joined: Apr 2010
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    RAraujo Senior Member - Naval Architect

    Yes, only in small vessels sea water is used in the head...
     
  2. Rumars
    Joined: Mar 2013
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    Location: Germany

    Rumars Senior Member

    I presume you refer to using diesel for making water. As a general approach you can calculate 1-1.5kWh for a 100l/h basic RO system.
     
  3. RAraujo
    Joined: Apr 2010
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    Location: Singapore

    RAraujo Senior Member - Naval Architect

    Our units are 180m3/day (they are big units) and consume about 46.5kW.
     

  4. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    FWIW, the US Navy sets the minimum as 5 gal/person/day for consumption, drinking and cooking only. So you try to keep the tanks full. If you lose one or more stills, you ration water; so salt water washing and flushing. I have been aboard a vessel that lost both stills; no showers, no shaves, no scuttlebutts, no laundry, only messmen wash and only the plant gets fresh water....And the CO standing on the ENG until it was fixed, because if we hit "bingo" we had to go in. He made it with about 6 hours to spare...but still no showers until the tanks were at 75%.
     
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