The following interpretations apply to the terms given in the
paragraphs of regulation 2:
1 "Upper deck"
1.1 A discontinuity in the upper deck which extends
over the full breadth of the ship and is in excess of 1m in length should be treated as a step
as defined in regulation 2(1) (see figure 1 in appendix 1).
1.2 Steps situated outside the "length" (article 2(8)) should not be considered.
1.3 A discontinuity in the upper deck which does not
extend to the side of the ship should be treated as a recess under the upper deck level (see
figure 2 in appendix 1).
1.4 In a ship having
openings in the side of the ship below the uppermost deck, which are not closed but limited
inboard by weathertight bulkheads and decks, the deck below such openings should be considered
the upper deck (see figure 3 in appendix 1).
The Administration may decide on this term as a special definition for
tonnage purposes is not needed.
This term should be considered as the midpoint of the length as defined in
article 2(8) where the forward terminal of that length coincides with the fore side of the
4 "Enclosed spaces"
4.1 In regulation 2(4) there is no contradiction
between the definition of enclosed spaces as being "bounded by the ship's hull, by fixed or
portable partitions ..." and "... nor the absence of a partition or bulkhead, shall preclude a
space from being included in the enclosed space".
4.2 Space located within the boundaries of "permanent or movable awnings" should be
subject to treatment under regulation 2(5).
Tanks, permanently located on the upper deck, provided with removable pipe connections to the
cargo system or the vent (de-airing) lines of the ship, should be included in Vc
4.4 The volume of weathertight steel pontoon
covers on hatchway coamings should be included in the calculations of the total volume (V) of
the ship. If such covers are open on the underside, their volume should also be included in
4.5 Multipurpose ships which have
the facility to trade with cargo hatches open or closed should always be measured with the
hatch covers considered to be closed.
kingposts, cranes, crane and container support structures, which are completely inaccessible
and above the upper deck, separated on all their sides from other enclosed spaces should not
be included in the total volume of all enclosed spaces. Air trunks having a cross-sectional
area not exceeding 1 m2
may also be excluded under the before-mentioned conditions.
All mobile cranes should be exempted.
5 "Excluded spaces"
5.1 The space between the side longitudinal
bulkhead of a deckhouse and the bulwark below a deck extending from side to side supported by
stanchions or vertical plates connected to the bulwarks, should be treated as an excluded
space in accordance with regulation 2(5)(b) and (c) (see figure 4 in appendix 1).
5.2 In the case
of a ro-ro ship, for exarnple, where the space at the end of an erection is fitted with means
for securing cargo, the space should be included in V in accordance with the first condition
of regulation 2(5).
should be obtained from the
Adrninistration's maritime safety authority.
7.1 The volumes of the segregated ballast tanks
should not be included in Vc
provided they are not to be used for cargo.
7.2 The volumes of clean ballast tanks in oil tankers
should be included in Vc
when the ship is fitted with a crude oil washing system
which would permit dual purpose cargo/clean ballast tank use of these tanks.
7.3 The volumes of dedicated clean ballast tanks should not be
included in Vc
- the tanks are not used for cargo;
- the ship carries a single IOPP Certificate which indicates it is operating with
dedicated clean ballast tanks in accordance with regulation
13A, Annex I, MARPOL 73/78;
- the following notation is inserted in the REMARKS
column on the International Tonnage Certificate (1969):
"This ship carries
an IOPP Certificate in conformity with regulation 13A, Annex
I, MARPOL 73/78. The following tanks are dedicated solely to the carriage of clean
ballast water: ..... "
7.4 The volumes of slop tanks for cargo residues should be included in Vc
7.5 In fishing vessels, the volumes of fish
processing spaces for fishmeal, liver oil and canning, tanks for re-cooling fish, wet fish
bunkers, stores for salt, spices, oil and tare should be included in Vc
gear stores should not be included in Vc
7.6 The volume of refrigerating machinery used for refrigerating cargoes and
situated within the boundaries of the cargo spaces should be included in Vc
7.7 The volumes of mail rooms, baggage compartments
separate from passenger accommodation, and bonded stores for passengers should be included in
. The volume of provision rooms for crew or passengers and bonded stores for
crew should not be included in Vc
On combination carriers, where the owners request to have the dual purpose oil/ballast tanks
converted to ballast tanks and excluded from Vc
, the ballast tanks should be
required to be permanently disconnected from the oil cargo system and not used for the
carriage of cargo. The ship should then be remeasured in accordance with regulation 5(3). Any
ballast tanks not to be included in Vc
should be solely allocated to ballast,
connected to an independent ballast system, and not used to carry cargo.
7.9 When determining the volumes of cargo spaces, no account should be
taken of insulation, sparring or ceiling which is fitted within the boundaries of the space
concerned. For ships which have permanent independent cargo tanks constructed within the ship,
e.g. gas tankers, the volume to be included in Vc
should be calculated to the
structural boundary of such tanks, irrespective of insulation which may be fitted on the
inside or outside of the tank boundary.
volumes of dual purpose spaces such as those used for both ballast and cargo should be
included in Vc
7.11 Spaces allocated to
passenger automobiles should be included in Vc