8.1 The atmosphere should be tested frequently
whilst the space is occupied and persons should be instructed to leave
the space should there be a deterioration in the conditions.
8.2 Persons entering enclosed spaces should be
provided with calibrated and tested multi-gas detectors that monitor
the levels of oxygen, carbon monoxide and other gases as appropriate.
8.3 Ventilation should continue during the period
that the space is occupied and during temporary breaks. Before re-entry
after a break, the atmosphere should be re-tested. In the event of
failure of the ventilation system, any persons in the space should
leave immediately.
8.4 Particular care should be exhibited when working
on pipelines and valves within the space. If conditions change during
the work, increased frequency of testing of the atmosphere should
be performed. Changing conditions that may occur include increasing
ambient temperatures, the use of oxygen-fuel torches, mobile plant,
work activities in the enclosed space that could evolve vapours, work
breaks, or if the ship is ballasted or trimmed during the work.
8.5 In the event of an emergency, under no circumstances
should the attending crew member enter the space before help has arrived
and the situation has been evaluated to ensure the safety of those
entering the space to undertake rescue operations. Only properly trained
and equipped personnel should perform rescue operations in enclosed
spaces.