Exam Question

(a) Explain the purpose of non-watertight longitudinal subdivision of tanks. (6)

(b) A box-barge 30 m long and 9 m beam floats at a draught of 3 m. The centre of gravity lies on the centreline and KG is 3.50 m. A mass of 10 tonne, which is already on board, is now moved 6m across the ship.

(i) Estimate the angle to which the vessel will heel, using the formula GZ = sinθ (GM + 1/2BM tan2 θ)

(ii) Compare the above result with the angle of heel obtained by the metacentric formula. (10)