Page 363 - Practical Ship Design

320 Chapter 1 I

No of possible damages
for "Nu cornpartmats
T = (n t 11112
A
Par 6 compartments
No of spaces 10 of
flooded damages
one 6
two 5
three 4
four 3
three 2
six 1
x
total 21

111 2 I 3 I 4 I5 161
A.T.k-, LS -I P.T.
One compt A.T. to P.T. C 4 Pi=l
One compt from A.T. 4 Plk pi = P + 0.5 ap t q
I- P12 -I
P123 -1
{- PI234 -'
4
C-------- PI2345 -

One cmpt to P.T. :- P23456 -1 Pi= 1 - P + 0.5 ap
I- P3456 -1
+ P456 _7(
FP56 -I
-1 P+
One compt inside A.T. I- P2 + P3 + P4 f- P5-I pi = ap; pi= ap - q for
and P.T. caopts aver midlength.*
hro cmpts (typical) +- P34 -; pi = P34 - P3 - P4
t- P3 t. P4 -I
Three compts (typical) I-- P234 --I Pi' P234 - P23 - P34 - P3
+ P23 ----I
+ e34 __I
+ P3 -I
Pour compts I - P2345 -' Pi= P2345 - P234 - P345 t P34
{-P234 -(
+ P345 --I
+ P34 __I * g calculated with P2 based on
J = J'/ JlnaX

Fig. 11.3. Probabilistic subdivision of cargo ships. Calculation of pi.

The contribution of compartments that are subdivided by longitudinal bulk-
heads are to be adjusted to allow for the probability of these bulkheads being
breached or not.