3 The provisions of the 1969 Tonnage
Measurement Convention for treatment of enclosed spaces should
be applied to open-top containerships subject to the following unified
interpretations:
-
.1
Upper deck (regulation 2(1))
In a ship which is exempted by the Administration from the requirements
to fit weathertight hatch covers .on the uppermost deck exposed to
weather and sea, as in an open-top containership, the upper deck should
be taken as that deck which would have been determined by regulation 2(1) as if such hatch covers had
been fitted.
-
.2
Enclosed spaces (regulation 2(4))
In open-top containerships, an opening in a deck such as the
absence of hatch covers should not preclude a space from being included
in the enclosed space.
-
.3
Shelter above container stacks
In the case of open-top containerships having movable non-load-bearing
covers (shelter) of light construction resting on the container-guides,
the space above the hatch coamings up to the covers does not qualify
as an excluded space according to regulation
2(5). For this particular design, however, an exception can
be made in accordance with regulation l(3).
The space can be excluded provided that this type of ship meets the
requirements of an open-top containership without such covers.