Page 225 - statbility for masters and mates

(c) Now ®nd new drafts.
Drafts before trimming Change due to trim Ans. New Drafts
Example 7
A box-shaped vessel 100 metres long 20 metres wide 12 metres deep is ¯oating in salt water on an even keel at 6 metres draft. A forward compartment is 10 metres long, 12 metres wide and extends from the outer bottom to a watertight ¯at, 4 metres above the keel. The compartment contains cargo of permeability 25 per cent. Find the new drafts if this compartment is bilged.
A 4.821 m 1:033 m A 3.788 m
F 4.821 m 1:181 m F 6.002 m
Bilging and permeability 213
Mass of water entering 25 10 12 4 1:025 the bilged compartment 100
TPCSW WPA 97:56
100 20 97:56
TPC 20:5 tonnes
123 tonnes
Increase in draft w/TPC
123/20.5
6 cm Increase in draft 0:06 m
W L B d 1:025 1
100 20 6 1:025
W 12 300 tonnes
Fig. 21.5
IL BL3 B L3 L2 BML V 12V 12 L B d 12 d1
BML 100 100 12 6
BML 139 metres
MCTC'W BML 12300 139 100 L 100 100