6.4.1 Smaller ports may however be accepted in
a vessel having only small side deck areas in which water can be trapped,
the reduced area being based on the volume of water which is likely
to become so trapped. The following correction to the required freeing
port area may be applied:-
Where
|
FPREQ
|
= |
Freeing
port area required |
|
FPMAX
|
= |
Maximum
freeing port area required |
|
AACT
|
= |
Actual
area of deck fitted with enclosed bulwarks, excluding superstructure
or deckhouse area |
|
AMAX
|
= |
Area
of maximum sized well (0.7L × B) where L and B are the dimensions
of the vessel |
6.4.2 When a non-return shutter or flap is fitted
to a freeing port it should have sufficient clearance to prevent jamming
and any hinges should have pins or bearings of non-corrodible material.
6.4.3 A decked vessel which does not comply with
the freeboard requirements of Section 12,
and does not possess reserve buoyancy above the weather deck, as defined
in Section 4.1.3.2, should be treated as
an open boat and be provided with bilge pumping in accordance with Section 10.4.
6.4.4 In a vessel where freeing ports cannot be
fitted, other efficient means of clearing trapped water from the vessel
should be provided to the satisfaction of the Certifying Authority.
6.4.5 Structures and spaces considered to be non-weathertight
should be provided with efficient drainage.
6.4.6 Where cargo is to be stowed on deck, the
stowage arrangement should be such as to not impede the free flow
of water from the deck.
6.4.7 A vessel intended to operate in sea areas
where ice accretion can occur should be specially considered with
regard to water freeing arrangements. (Also see Section
11.1.1.5.)