Page 359 - Practical Ship Design

316 Chapter I1

Where P, > P:
(M + 2P)
C, = 72
V+P, -P

In other cases:
(M +2P)
C, = 72
V
M = volume of machinery space below margin line and between bulkheads
P = volume of passenger spaces below margin line
P,=K.N
N = number of passengers
K = 0.056 L

Factor ofsubdivision (F): The factor of subdivision for ships of 131 m or more is
generally calculated from the formula:

(A -B)(C, - 23)
F=A-
100
There are the following exceptions to this formula:
(a) where C, = or > 45 and 0.50 < Ff < 0.65 then F shall be 0.50
(b) where Ff < 0.40 and it can be shown to be impracticable to meet this in
the machinery space F may = 0.40 in this compartment.
Ff = factor from the above formula.

The factor of subdivision for ships where 79 < L (m) < 131 is determined by the
formula below and lies between 1 .OO and the value B with interpolation using the
factor S:
3574 - 25L
where S =
13

( = 123 for L = 79)
(= 23 for L = 131)
(1 -B)(C, -s>
F=l-
123-S

For ships where L < 79, the factor of subdivision F = 1 .OO, but this may be relaxed,
if it can be shown to be impracticable.
A factor of subdivision F = 1.00 also applies to ships of any length carrying
more than 12 passengers but less than L2/650 or 50 whichever is less (these equate
at L = 180.3 m).