ballast draft

Discussion in 'Boat Design' started by abalkees, Feb 26, 2014.

  1. abalkees
    Joined: Dec 2013
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    abalkees Junior Member


    I am working on a project to optimize a tanker ship for both the laden journey and the ballast leg (return journey).

    My ship design draft is 12.18 m. I am wondering how to define the ballast draft for my design case and in general. IS there an assumption or an empirical method to get the ballast draft?

    any help please?
    Thx, Alaa
  2. Olav
    Joined: Dec 2003
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    Olav naval architect

    There are MARPOL requirements to be met (Annex I of MARPOL 73/78, I think) which define minimum draught at midship and the corresponding draughts at the perpendiculars (there is a maximum trim rule).

    Sufficient propeller immersion (= draught at AP) and the prevention/reduction of slamming (= draught at FP) are also important aspects to be considered.
  3. NavalSArtichoke
    Joined: Oct 2013
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    NavalSArtichoke Senior Member

    abalkees - A friendly reminder about the rules of these forums. Don't post the same thread in more than one forum. It's confusing to people trying to reply to you, because they will leave a reply in one forum but not any of the others.

    I left a reply to this thread in the Stability forum.
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