Class 2 (2nd Engineer) SC&S 📅 Aug 2022

Exam Question

(a) Describe how water tightness is maintained where bulkheads are pierced by longitudinal, beams or pipe. (6)

(b) The length of a ship is 7.6 times the breadth, while the breadth is 2.85 times the draught. The block coefficient is 0.69, prismatic coefficient 0.735, waterplane area coefficient 0.81 and the wetted surface area 7000m2. The wetted surface area S is given by Denny's formula Calculate: (10)

(i) Displacement in tonne

(ii) Area of immersed midship section

(iii) Waterplane areas

Reference Answer

(a) Water tightness of bulkheads that are pierced by longitudinal beams or pipes:
Bulkheads must be made structurally watertight without the use of wood packing.
Pipes passing through bulkheads are either welded or fastened to the bulkhead using studs or hoses secured through tapped holes in the plating.
When a bulkhead is pierced by a longitudinal beam, the openings are kept as small as possible, and doubler plates are welded on each side to maintain watertight integrity.

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