Measurement of Deck Spaces:
For vessels fitted with superstructures, the
following rules, which concern only such spaces as are excluded from
the national tonnage, are applied.
A - Vessels with one tier of superstructures
only :
(1) Poop, bridge, forecastle :
The following exemptions are allowed under certain
conditions :
- Such length of the poop measured from the
in side of the stern timber, at half height of the said poop, as shall
be equal to 1/10th of the full length of the ship.
- The Portion of the bridge in way of the light
and air spaces of the engine and boiler spaces, is being understood
that such light and air spaces are not considered to extend beyond
the forward bulkhead of the stoke-hold and the after bulkhead of the
main engine-room.
- Such length of the forecastle measured from
the inside of the stem at half height of the said forecastle, as shall
be equal to 1/8th of the full length of the ship.
- In each of the above three cases of superstructures,
such portions as are in way of corresponding openings in the sides
of the ship, not provided with any means of closing.
(2) Poop and bridge combined, or forecastle and
bridge combined :
In each of these combined spaces, the following
exemptions are allowed under certain conditions :
- a) That length only which corresponds to the
openings of the engine-room and boiler spaces as specified in (1b)
above.
- b) Such portions as are in way of corresponding
openings not provided with any means of closing in the sides of the
ship.
(3) Shelter-decks.
In the case of shelter-decks. the following exemptions
are allowed under certain conditions:
- a) The portions in way of corresponding openings
in the side plating of the ship not provided with any means of closing.
- b) Such air spaces as are situated within
the shelter-decks must be measured into the engine-room space and
deducted together with 75% of their volume.
B - Vessels having more than one tier
of superstructures :
- The exemptions Prescribed in paragraph A-(I),
(2) and (3) above are applicable in their entirety to the lowest tier
only.
- Tiers above the lowest tier, are only allowed
the exemption of such portions as are in way of corresponding openings
in the side plating of the vessel not provided with any means of closing.