Cargo loading, tank cleaning and gas-freeing are those procedures
on board a tanker that expose the crew to the largest risk of exposure
to vapours from the products carried, both in the accommodation and
on open deck. It is, therefore, essential during these operations
that all:
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.1 openings to the accommodation are closed or
battened down;
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.2 ventilation in the accommodation is either
re-circulated or shut down; and
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.3 work on deck follows the provisions given in
paragraph 5.2.