Page 167 - Practical Ship Design

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Chapter 5

Volume, Area and Dimension-Based Designs

5.1 VOLUME-BASED CARGO SHIPS

The design of capacity carriers poses two different types of problem. In the first of
these the required capacity is known and the problem is that of finding a solution to
the volume equations given in 53.2, whilst in the second the problem lies in
establishing the required volume and this is dealt with in $5.2.
Reverting to the first case, the first step is to convert the required cargo capacity
from whatever type of measure it is specified in to a corresponding moulded
capacity by dividing by the following coefficients:
Vg /V, = 0.98

V,/V, = 0.88
V,/V,,, = 0.72

where
Vs = grain capacity
V,, = bale capacity
V, = refrigeration capacity
V,,, = moulded cargo capacity.
If the cargo spaces include both refrigerated and general cargo spaces, the total
moulded capacity is the sum of the moulded capacities of both types of cargo
space. Any cargo space which it is intended to provide above the upper deck is then
deducted to give the moulded volume of cargo space required below the upper
deck.
In the author’s 1962 and 1976 papers, graphs were given from which the
dimensions of a ship corresponding to a required capacity could be read. The 1962