Page 418 - statbility for masters and mates

406 Ship Stability for Masters and Mates
SHIP STABILITY
Attempt ALL questions
Marks for each question are shown in brackets
1. A box shaped vessel, length 96 m, breadth 18 m, is ¯oating on even keel draught of 5.70 m in salt water.
KG 5.77 m.
A full width forward compartment extending 13 m aft of the forward
perpendicular is bilged.
Calculate the resultant draughts. (35)
2. Ship `A', KG 8.20 m, is ¯oating at an even keel draught of 6.80 m in salt water.
With the aid of Datasheets Q.2(a) Tabulated KN values and Q.2(b) Hydrostatic Particulars, compare the ship's stability values with those required by the current Loadline Rules. (35)
3. A vessel is ¯oating at an even keel draught of 7.93 m in salt water. The vessel is to proceed to a dock where the water has a relative density
of 1.003.
Displacement 36 000 t TPC 34 MCTC 220 LBP 184m LCB 80m foap LCF 96m foap
Calculate EACH of the following:
(a) the trim on entering the dock; (18)
(b) the draught aft on arrival. (17)
4. (a)
Explain why the values of trim and metacentric height in the freely a¯oat condition are important when considering the suitability of a vessel for drydocking. (15)
6. (a)
. departure condition . arrival condition
Explain the reasons for the differences between the two curves. (15)
Describe an `A' Class Division as de®ned by the Merchant Shipping
(b) Describe the effect on a vessel's buoyancy of removing water from a drydock after taking the blocks aft with a stern trim. (8)
(c) Describe TWO methods of determining the upthrust (P force) during the critical period. (12)
Show by means of suitable sketches how beam and freeboard affect the shape of the GZ curve. (15)
5. (a)
(b) Draw TWO curves of statical stability on the same axis to illustrate:
(Fire Protection) Regulations. (15) (b) Describe the measures required for the protection of stairways and lifts. (15)