Initial stability

DELFTship forum Hydrostatics and stability Initial stability

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      optymista93
      Participant

      Hi,

      I’m struggeling with calculating initial stability for a homogeneous barge.
      <p style=”margin: 0in; background: white;”>We consider a flat bottom barge with dimensions l x b x h of 60.0m x 20.0m x 4.0m.</p>
      <p style=”margin: 0in; background: white;”>Max draught 3.2m, (DWT 3375t). The mass is 1200t.</p>
      <p style=”background: white; margin: 9.0pt 0in 9.0pt 0in;”>The barge shall carry 2 pieces of equipment/ (modules):
      mass 1200 t with height 8 m, length 20m, width 10m
      mass 600 t with height 5 m, length 10m, width 10m
      </p>
      Assuming the centers of gravity for the modules are in the centers of the modules, how much can the weight of the heaviest module increase without need for ballast, requiring a GM of 0.3m? Check that the freeboard is 0.8m

      My calculations give me GM = 6.13m, which is a lot different from 0.3m included in the text. What am I missing?

      Calcs

      https://imgur.com/cUfFEiE

       

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