Regulation 13 – Position of hatchways, doorways and ventilators
1 For the purpose of these regulations, two positions of hatchways,
doorways and ventilators are defined as follows:
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Position 1 – Upon freeboard decks and raised quarterdecks, or other
exposed decksfootnote lower than one standard height of
superstructure above the freeboard deck, and upon exposed decksfootnote situated forward of a point located a
quarter of the ship's length from the forward perpendicular that are
located lower than two standard heights of superstructure above the
freeboard deck.
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Position 2 – Upon exposed decksfootnote situated abaft a quarter of the ship's
length from the forward perpendicular and located at least one standard
height of superstructure above the freeboard deck and lower than two
standard heights of superstructure above the freeboard deck.
Upon exposed decksfootnote situated forward of a point located a quarter of the
ship's length from the forward perpendicular and located at least two standard
heights of superstructure above the freeboard deck and lower than three standard
heights of superstructure above the freeboard deck.
Regulation 20 – Air pipes
2 Where air pipes to ballast and other tanks extend above:
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.1 the freeboard deck; or
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.2 other exposed decksfootnote lower than two standard
heights of superstructure above the freeboard deck,
the exposed parts of the pipes should be of substantial construction, and
the height from the deck to the point where water may have access below should be at
least:
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.1 760 mm on the freeboard deck or other exposed decksfootnote lower than one standard height of
superstructure above the freeboard deck; and
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.2 450 mm on other exposed decksfootnote lower than two standard heights of
superstructure above freeboard deck.
Note: Flush bolted access covers, which are of substantial construction
and are secured by gaskets and closely spaced bolts to maintain water tightness, are
not subject to the minimum sill height requirements.
Regulation 27 – Types of ships
Regulation 27(13)(e)
3 Openings include ventilators (complying with regulation 19(4) of the
International Convention on Load Lines, 1966) that for operational reasons have to
remain open to supply air to the engine-room, emergency generator room or closed
ro-ro and vehicle spaces (if the same is considered buoyant in the stability
calculation or protecting openings leading below) for the effective operation of the
ship. Where it is not technically feasible to treat some closed ro-ro and vehicle
space ventilators as unprotected openings, Administrations may allow an alternative
arrangement that provides an equivalent level of safety.
Regulation 37 – Deduction for superstructures and trunks
Regulation 37(3)
4 For ships assigned a type "B" freeboard, including reduced type "B", if the
effective length of a forecastle is less than 0.07 L, a superstructure
deduction cannot be applied to the ship.
For example, if the ship has no forecastle, or the effective length of the forecastle
is less than 0.07 L, and has other superstructure, no superstructure
deduction is to be applied.
In case the ship has a full superstructure (one that extends from AP to FP, per
regulation 3(10)(h) of Annex B of the 1988 Load Lines Protocol), the deduction for a
superstructure may be applied in accordance with regulation 37(1) of Annex B of the
1988 Load Lines Protocol.