It is not possible to draw up or recommend any universal
solutions for the distribution of the air flow in different types
of vessel. Duct runs and the location of supply air and exhaust air
openings must be made to suit the design of the individual ship, the
estimated cargo handling and exhaust emissions in areas occupied by
the crew and other workers.
The following generally applies:
- The air flow should reach all parts of the ro-ro cargo space.
However, ventilation should be concentrated in those areas in which
the emissions of exhaust gases are particularly high and which are
occupied by the crew or other workers.
- Areas in front of ducts that should not be obstructed should be
identified by painting a line around the area on the deck and labelling
"Keep area clear for proper ventilation".
- Consideration should be given to the likelihood of unventilated
zones being screened behind an object, and also to the fact that exhaust
gases readily accumulate in low-lying spaces under the vehicles and
in decks beneath the one being unloaded. Furthermore, depending on
air flow patterns, it may be possible for contaminants to move into
decks above the one actually being off-loaded.
- The air flow on vehicle deck should be suited to the height of
the deck.
- The air flow will follow the path of least resistance, and most
of the air will thus flow in open spaces, such as above the vehicles
etc.
- Polluted air from ro-ro cargo spaces must be prevented from being
dispersed into adjacent spaces, for instance accommodation and engine
rooms.
- Whenever possible, places which are sheltered from the air flow
should be indicated. For example, the deck should be painted in a
conspicuous manner to indicate that personnel should not stand on
that part of the deck, and signs should be hung on the bulkhead to
provide a backup warning.