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.