C L DUBEY – EXERCISE – 08 (DRY DOCKING)

	Fwd	Aft
Draft	3.9m	5.2m
	-0.154m	-0.154m
	+0.578m	-0.546
	4.324m	4.50m

6. A ship of displacement 8487t, LBP 140m, draft For’d 3.0m and Aft 5.8m, KG 8.6m, FSM 800 tm, LCF 72.1m from ap, MCTC 161 tm enters a salt water drydock. Calculate the GM (fluid) and the moment of statical stability at 1° heel at the critical instant of taking the blocks all over, given the KM at this instant is 9.57m.

Solution –

Once vessel has taken block allover change in trim = 2.8 m

P = 280 ⨯ 161/72.1
= 625.24 tonnes

GG₁ = P ⨯ KM/W
= 625.24 ⨯ 9.57/8487
= 0.705m

GM = (0.868 – 0.705)
        = 0.163m

Moment of statical stability = (W ⨯ GZ)
= W ⨯ GM SinӨ
= 8487 ⨯ 0.163 ⨯ Sin 1⁰