C L DUBEY – EXERCISE – 08 (DRY DOCKING)

Therefore, Fwd & Aft = 4.178 

• When unstable GG₁ = 0.45

0.45 = P ⨯ 4.5/3000
P = 300 tonnes
Rise = P/ TPC ⨯ 100
= 0.25

Draft Fwd & Aft when unstable = (4.262 – 0.25)m
                                                             = 4.012m

17. A ship LBP 240m, W 20000 tonnes, KG 9.0m, TPC 30, LCF 5m abaft of amidships is being dry-docked drawing 6m forward 8m aft. When just landing flat on the blocks the draught is 6.2m. calculate the loss of GM at this time.

Solution –

Correction to aft draft = ( 2 ⨯ 115)/240
= 0.958m

Hd (Hydrostatic  draft ) = 7.042m
After landing flat = draft is 6.2m
Change in Hydrostatic draft = (7.042 – 6.2)m
= 0.842m

Rise = P/ TPC ⨯ 100
= 0.842m