Page 175 - Practical Ship Design

Volume, Aretr NIZ~ Dimension-Based Designs 141

(38) Generul stores
Allow 140 m3 + 0.1 m3 per person per day. An insight into the variety of refrigerated
and general stores carried by a high class cruise liner is given in Table 5.5 compiled
from a very interesting hand-out given to passengers.

(39)-(4/) Machinep space volume including casings, shaft tunnel
The total volume of these spaces can be estimated from the machinery weights
calculated as suggested in 34.5 by the use of a density figure derived from a
suitable basis ship whose machinery weight and volume is known. Approximate
densities are:
Slow speed diesels: 0.16 tonnes/m3
Medium speed diesels: 0.13 tonnes/m3
High speed diesels: 0.1 I tonnes/m3 (on ferries)
Gas turbines: 0.1 o tonnes/m3 (on frigates)

(42)-(49) Miscellmneous spuces
The space provided for each of these items should be assessed on the basis of the
specification and measurements from plans of ships which appear similar to the
one being designed.

5.2.2 Tween deck heights

To convert the areas into volumes it is necessary to allot to each of the areas an
appropriate tween deck height.
Cabin areas: 2.45-2.50 m on larger ships.
2.60 m on the deck in which the main ventilation
trunks and main electric cables are run.
Main public rooms: 2.90 m
Galley: 2.75 m

5.2.3 Standard calculation sheet
A standard calculation sheet (from the 1976 R.I.N.A. paper) for the design of a
passenger ship or with some adaptation for the design of any ship whose volume
needs to be calculated as a preliminary to assessing its dimensions is presented as
Fig. 5.1.
Although the passenger numbers will be specified, those of the crew may not be
and the completion of this sheet needs an estimate to be made of the crew numbers.
This subject along with that of the crew requirements of other ship types is
addressed in 55.5.