For the purpose of application of regulation 18.3.2, the following
operations of oil tankers are regarded as falling within the category
of exceptional cases:
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.1 when combination carriers are required to operate
beneath loading or unloading gantries;
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.2 when tankers are required to pass under a low
bridge;
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.3 when local port or canal regulations require
specific draughts for safe navigation;
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.4 when loading and unloading arrangements require
the tanker to be at a draught deeper than that achieved when all segregated
ballast tanks are full;
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.5 close-up inspection or/and steel thickness
measurement using rafts where permitted by the rules; and
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.6 tank hydrostatic pressure tests.