Single pull macgregor type hatch cover.pdf - Cochin University of ...

secured by tarpaulins and battening devices, e.g. beams and boards .Position 1 hatch
board are defined as those on exposed freeboard decks, raised quarter decks, and
exposed superstructure decks within the forward quarter length of ship, while position
2 hatchways are those on exposed superstructures deck is regarded as the deck
immediately above the freeboard deck.
Length,
metres
Table 3.2 Increase in freeboard
Freeboard
Increase,
mm
30 50 300
60 50 623
90 50 1125
120 84 1774
150 228 2543
180 313 3228
3.1.4 Freeboard Deck
Resultant
Freeboard,
mm
Source: Cargo Access Equipment for Merchant Ships.
Regulation 3, paragraph 9 of 1966 LLC defines the freeboard deck and is quoted here
in full as it has an important bearing on all aspects of equipment used for closing
cargo openings.
The freeboard deck is normally the uppermost complete deck exposed to
weather and sea, which has permanent means of closing cargo openings in the side of
the ship are fitted with permanent means of watertight closing. In a ship having a
discontinuous freeboard deck,
The lowest line of exposed deck and the continuation of that line parallel to the
upper part of deck is taken as freeboard deck. At the option of the owner and subject
to the approval of the Administration ,a lower deck may be designated as the
freeboard deck provided as it is complete and permanent deck continuous in a fore
and aft direction at least between the machinery space and peak bulkheads and
continuous athwart ships. When this lower deck is stepped the lowest line of the deck
and the continuation of that line parallel to upper part of the deck and is taken as the
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