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Chapter 9

Machinery Selection

9.1 INTRODUCTION AND CRITERIA FOR CHOOSING THE MAIN ENGINE

The selection, arrangement and specification of the main and auxiliary machinery
is the province of the marine engineer. In this chapter only those aspects of these
tasks which directly affect the naval architect as the overall ship designer are dealt
with - and the treatment is necessarily a simplified one. It commences with an
examination of the criteria against which the choice of main engines is made,
which include:
9.1.2 Required horsepower
9.1.3 Weight
9.1.4 Space
9.1.5 Capital cost
9.1.6 Running costs
9.1.7 The ship’s requirement for electrical power and heat
9.1.8 Reliability and maintainability
9.1.9 The ship’s requirement for manoeuvring ability and/or for slow-speed
operation
9.1.10 Ease of installation
9.1.1 1 Vibration
9.1.12 Noise and other signatures
9.1.13 Availability

The importance of each of these criteria differs from one ship type to another. In
some ships only a few of the criteria need be considered, in others all must be taken
into account although with different degrees of emphasis. Each criterion is consi-
dered briefly in the following sections.