Page 360 - Ship Construction.DJ Eyres 6Ed

Ch31-H8070.fm Page 349 Wednesday, October 18, 2006 7:06 AM
Load Line Rules 349
(5) Machinery Space Openings These are to be properly framed and effi-
ciently enclosed by steel casings of ample strength. Where casings are not
protected by other structures their strength is to be specially considered.
Steel doors to be fitted for access should have the sills at least 600 mm
above the deck in Position 1, and at least 380 mm above the deck in Posi-
tion 2. Fiddley, funnel, or machinery space ventilator coamings on exposed
decks are to be as high above deck as reasonable.
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(6) Other Openings in Freeboard and Superstructure Decks Manholes and
flush scuttles in Positions 1 or 2 or within superstructures other than
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enclosed superstructures should be closed by substantial weathertight
covers. Other openings than those considered are to be protected by an
enclosed superstructure or deckhouse, or companionway of equivalent
strength. Doors for access should be of steel, and the sills should have the
same heights as above.

(7) Ventilators Should have steel coamings and where they exceed
900 mm in height they should be specially supported. In Position 1 ventila-
tor coamings should be of height 900 mm above deck, and in Position 2
760 mm above deck. Vent openings should be provided with efficient
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weathertight closing appliances except in the case of coamings exceeding
4.5 m in height in Position 1 and 2.3 m in height in Position 2, above deck.

(8) Air Pipes Exposed parts of pipe shall be of substantial construction.
The height from the deck should be at least 760 mm on the freeboard deck,
and 450 mm on superstructure decks. A lower height may be approved if
these heights interfere with working arrangements. Permanently attached
means of closing the pipe openings should be provided.

(9) Cargo Ports and Other Similar Side Openings Below the freeboard deck
to be fitted with watertight doors to ensure the ship’s structural integrity.
Unless permitted by the Administration the lower edge of such openings
should not be below a line drawn parallel to the freeboard deck at side,
which has at its lowest point the upper edge of the uppermost load line.

(10) Scuppers, Inlets, and Discharges Discharges led through the shell
either from spaces below the freeboard deck or from within superstructures
and deckhouses on the freeboard deck fitted with weathertight doors
should be fitted with efficient and accessible means for preventing water
from passing inboard. Normally this should be an automatic non-return
valve with means of closing provided above the freeboard deck. Where the
vertical distance from the summer water-line to the inboard end of the dis-
charge pipe exceeds 0.02L the discharge may have two automatic non-
return valves without positive means of closing, provided the inboard valve