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1
Water ballast tanks, except those specified in the right column, and
cargo oil tanks
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2
Water ballast wing tanks of less than 5 m width forming double side
spaces and their bilge hopper sections
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Access to the underdeck and vertical structure
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1.1 For tanks of which the height is 6 m and over
containing internal structures, permanent means of access shall be provided
in accordance with .1 to .6:
.1 continuous athwartship permanent access arranged at
each transverse bulkhead on the stiffened surface, at a minimum of 1.6 m to
a maximum of 3 m below the deck head;
.2 at least one continuous longitudinal permanent means
of access at each side of the tank. One of these accesses shall be at a
minimum of 1.6 m to a maximum of 6 m below the deck head and the other shall
be at a minimum of 1.6 m to a maximum of 3 m below the deck head;
.3 access between the arrangements specified in .1 and
.2 and from the main deck to either .1 or .2;
.4 continuous longitudinal permanent means of access
which are integrated in the structural member on the stiffened surface of a
longitudinal bulkhead, in alignment, where possible, with horizontal girders
of transverse bulkheads are to be provided for access to the transverse webs
unless permanent fittings are installed at the uppermost platform for use of
alternative means as defined in paragraph 3.9 of the Technical Provisions
for inspection at intermediate heights;
.5 for ships having cross-ties which are 6 m or more
above tank bottom, a transverse permanent means of access on the cross-ties
providing inspection of the tie flaring brackets at both sides of the tank,
with access from one of the longitudinal permanent means of access in .4;
and
.6 alternative means as defined in paragraph 3.9 of the Technical
Provisions maybe provided for small ships as an alternative to .4 for cargo
oil tanks of which the height is less than 17 m.
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2.1 For double side spaces above the upper knuckle point
of the bilge hopper sections, permanent means of access are to be provided
in accordance with .1 to .3:
.1 where the vertical distance between horizontal
uppermost stringer and deck head is 6 m or more, one continuous longitudinal
permanent means of access shall be provided for the full length of the tank
with a means to allow passing through transverse webs installed at a minimum
of 1.6 m to a maximum of 3 m below the deck head with a vertical access
ladder at each end of the tank;
.2 continuous longitudinal permanent means of access,
which are integrated in the structure, at a vertical distance not exceeding
6 m apart; and
.3 plated stringers shall, as far as possible, be in
alignment with horizontal girders of transverse bulkheads.
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1.2 For tanks of which the height is less than 6 m,
alternative means as defined in paragraph 3.9 of the Technical Provisions or
portable means may be utilized in lieu of the permanent means of access.
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2.2 For bilge hopper sections of which the vertical
distance from the tank bottom to the upper knuckle point is 6 m and over,
one longitudinal permanent means of access shall be provided for the full
length of the tank. It shall be accessible by vertical permanent means of
access at each end of the tank.
2.2.1 The longitudinal continuous permanent means of
access may be installed at a minimum 1.6 m to maximum 3 m from the top of
the bilge hopper section. In this case, a platform extending the
longitudinal continuous permanent means of access in way of the webframe may
be used to access the identified structural critical areas.
2.2.2 Alternatively the continuous longitudinal permanent
means of access may be installed at a minimum of 1.2 m below the top of the
clear opening of the web ring allowing a use of portable means of access to
reach identified structural critical areas.
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Fore peak tanks
1.3 For fore peak tanks with a depth of 6 m or more at
the centre line of the collision bulkhead, a suitable means of access shall
be provided for access to critical areas such as the underdeck structure,
stringers, collision bulkhead and side shell structure.
1.3.1 Stringers of less than 6 m in vertical distance from the
deck head or a stringer immediately above are considered to provide suitable
access in combination with portable means of access.
1.3.2 In case the vertical distance between the deck head and
stringers, stringers or the lowest stringer and the tank bottom is 6 m or
more, alternative means of access as defined in paragraph 3.9 of the
Technical Provisions shall be provided.
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2.3 Where the vertical distance referred to in 2.2 is
less than 6 m, alternative means as defined in paragraph 3.9 of the
Technical Provisions or portable means of access may be utilised in lieu of
the permanent means of access. To facilitate the operation of the
alternative means of access, in-line openings in horizontal stringers shall
be provided. The openings shall be of an adequate diameter and shall have
suitable protective railings.
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