Stainless steel integral water tank

Discussion in 'Boat Design' started by idpnd, Jan 30, 2010.

  1. idpnd
    Joined: Aug 2009
    Posts: 24
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: UK

    idpnd Junior Member


    I am wondering how a stainless steel integral water tank could be built into the steel hull of my boat. The keel is quite wide and there are already a few tanks in there.

    Do you have to separate the two types of steel from each other to prevent electric charges?
  2. CDK
    Joined: Aug 2007
    Posts: 3,324
    Likes: 148, Points: 63, Legacy Rep: 1819
    Location: Adriatic sea

    CDK retired engineer

    There are may stainless steel hose clamps with a galvanized screw. Put one in a glass of water with some salt for a week and you'll see how fast the screw is eaten by corrosion.
  3. kenJ
    Joined: Jul 2005
    Posts: 349
    Likes: 5, Points: 0, Legacy Rep: 56
    Location: Williamsburg, VA

    kenJ Senior Member

    You don't need stainless for water. Rotomolded plastic or a collapsible bag in a fiberglass liner is a better choice without the corrosion issues .
  4. gonzo
    Joined: Aug 2002
    Posts: 16,578
    Likes: 1,560, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    A plastic tank or a bladder would be a better and cheaper solution.
  5. erik818
    Joined: Feb 2007
    Posts: 237
    Likes: 21, Points: 0, Legacy Rep: 310
    Location: Sweden

    erik818 Senior Member

    Where I work we often bolt stainless steel to other steel, using galvanized bolts. I've not seen any increased corrosion on the mating surfaces. I'm presuming that the inside of your boat is reasonably dry; submerging the tank and steel hull joint in salt water is a different case.

    In your situtation I would bolt the stainless steel tank to the steel hull with galvanized bolts. I would not connect metal pipes to the tank, only plastic or rubber. I would also distrust my advice and inspect fastenings every now and then. There are different kinds of both stainless steel and hull steel, so it's reasonabel to play safe.


  6. idpnd
    Joined: Aug 2009
    Posts: 24
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: UK

    idpnd Junior Member

    Thanks all for the feedback.

    Erik - just what I was looking for.

    Plastic people ;) If I were to put in plastic, I may as well epoxy coat the steel hull? (It's a rectangular bilge).
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.