4.1.1 The dedicated clean ballast tanks shall
have sufficient capacity to enable the tanker to meet the requirements
of Regulation 13(2) of Annex
I of MARPOL 73/78.
4.1.2 The selection of the dedicated clean ballast
tanks must be such that the hull stresses in the ballast and loaded
conditions are to the satisfaction of the Administration.
4.1.3 The ballast carried in dedicated clean ballast
tanks (CBT ballast) shall, from the accidental pollution prevention
point of view, be carried in wing tanks. However, the Administration
may permit the use of centre tanks where it can be shown that significant
advantage can be obtained in respect of hull stresses, tank volume
or piping arrangements.
4.1.4 Tanks shall be selected so as to require
a minimum of involvement of the cargo piping and pumping system.