The minimum quantity of segregated water ballast that a tanker must carry under the IMCO Regulation is based on a specific ballast condition draft and trim which are directly related to the vessel's length. Unfortunately, the above segregated ballast criteria cannot easily be converted into a function of capacity or deadweight. With this in mind a series of diagrams is presented to assist the designer to determine the amount of ballast required and to select hull proportions that will result in minimum ballast requirements for a given vessel deadweight. It is shown that for a 250,000 tonne DWT Crude Oil Tanker a 13 percent reduction in required segregated ballast results when the L/B ratio is reduced from 6 to 4.5. Low L/B ratios have been proposed for shallow draft vessels, but it is shown that from the point of view of minimum segregated ballast a low L/B ratio with deep draft is best.

  • Supplemental Notes:
    • Paper presented at SNAME (Gulf Section) Spring Meeting and Star Symposium: Merchant & Naval Design, The Past in Review The Future in Forecast, Houston, April 25-28, 1979.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Lamb, T
  • Publication Date: 1979

Media Info

  • Features: References;
  • Pagination: 9 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00189644
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: Apr 25 1979 12:00AM