13.2.1 Multi-hull
craft are to be provided with a suitable means of escape from each
accommodation compartment between watertight bulkheads in the event
of inversion of the craft.
13.2.2 Where
the requirement given in Pt 3, Ch 4, 13.2 Multi-hull craft escape hatches 13.2.1 is
achieved by means of escape hatches in the hull, these are to be fitted
in the inboard side of each hull, or in the transom, with the lowest
side of the opening at a minimum of 600 mm above the waterline in
both the upright and inverted conditions of the craft. Hatch openings
are to be a minimum of 450 mm x 450 mm and a maximum of 600 mm x 600
mm.
13.2.3 Escape
hatch frames and covers may be of steel, aluminium alloy or FRP construction
and are to be of equivalent strength to the unpierced hull side or
transom in which they are fitted.
13.2.4 Hatch
covers are to be weathertight when closed and the means of securing
the hatch cover are to be such that weathertightness can be maintained
in any sea condition.
13.2.5 Hydrostatic
pressure tests are to be carried out to confirm that the proposed
construction, when fitted in the hull, is able to withstand a pressure
of four times the design pressure and remain watertight.
13.2.6 Hatch
covers are to be flush with the hull and substantially hinged. Where
fitted in the inboard side of the hull, the hinges are to be on the
forward side.
13.2.7 To facilitate
a swift and safe means of escape to the lifeboat and life raft embarkation
deck, the following provisions apply to overhead hatches fitted along
the escape routes addressed by Regulation 13 - Means of escape:
-
escape hatches and
their securing devices are to be of a type which can be opened from
both sides;
-
the maximum force
needed to open the hatch cover is not to exceed 150 N; and
-
the use of a spring
counterbalance, equalising or any other suitable device on the hinge
side to reduce the force needed for opening is acceptable.