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Chapter 12

Stability and Trim - General

This chapter, in common with the preceding one and the one which follows, deals
with the statutory rules governing merchant ships; in this case those concerned
with stability and trim. Unlike the other two chapters the subject of this one,
stability and trim, is equally applicable to warship design and the treatment has
been extended to cover these ships.

12.1 MERCHANT SHIP STABILITY

12. I. I Merchant ship stability standards

There are a number of different standards which can be subdivided into:
(i) standards of intact stability which are applicable to all merchant ships,
unless higher standards are required any reason;
(ii) higher standards of intact stability which are required for the carriage of
certain special cargoes;
(iii) standards of damaged stability which apply to cargo ships permitted to
have a reduced freeboard, i.e. less than type B.
(iv) standards of damaged stability set within the probabilistic subdivision
rules for cargo ships and passenger ships respectively, as discussed in the
last chapter;
(v) standards of damaged stability applicable to passenger ships whose sub-
division has been dealt with by the deterministic rules.

12.1.2 Intact stability standards

Intact stability standards applicable to all merchant ships were laid down Inter-
nationally in the International Convention on Load lines 1966, and for British ships