Oil tankers of 20,000 tonnes deadweight and
above delivered after 1 June 1982
1 Every
crude oil tanker of 20,000 tonnes deadweight and above and every product
carrier of 30,000 tonnes deadweight and above delivered after 1 June
1982, as defined in regulation
1.28.4, shall be provided with segregated ballast tanks and
shall comply with paragraphs 2, 3 and 4, or 5 as appropriate, of this
regulation.
2 The capacity
of the segregated ballast tanks shall be so determined that the ship
may operate safely on ballast voyages without recourse to the use
of cargo tanks for water ballast except as provided for in paragraph
3 or 4 of this regulation. In all cases, however, the capacity of
segregated ballast tanks shall be at least such that, in any ballast
condition at any part of the voyage, including the conditions consisting
of lightweight plus segregated ballast only, the ship's draughts and
trim can meet the following requirements:
-
.1 the moulded draught amidships (d
m) in metres (without taking into account any ship's deformation)
shall not be less than:
-
.2 the draughts at the forward and after perpendiculars
shall correspond to those determined by the draught amidships (d
m) as specified in paragraph 2.1 of this regulation, in association
with the trim by the stern of not greater than 0.015L;
and
-
.3 in any case the draught at the after perpendicular
shall not be less than that which is necessary to obtain full immersion
of the propeller(s).
3 In no case shall
ballast water be carried in cargo tanks, except:
-
.1 on those rare voyages when weather conditions
are so severe that, in the opinion of the master, it is necessary
to carry additional ballast water in cargo tanks for the safety of
the ship; and
-
.2 in exceptional cases where the particular character
of the operation of an oil tanker renders it necessary to carry ballast
water in excess of the quantity required under paragraph 2 of this
regulation, provided that such operation of the oil tanker falls under
the category of exceptional cases as established by the Organization.
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SEE INTERPRETATION 32
Such additional ballast water shall be processed and discharged
in compliance with regulation 34 of
this Annex and an entry shall be made in the Oil Record Book Part
II referred to in regulation 36 of
this Annex.
4 In the
case of crude oil tankers, the additional ballast permitted in paragraph
3 of this regulation shall be carried in cargo tanks only if such
tanks have been crude oil washed in accordance with regulation 35 of this Annex before
departure from an oil unloading port or terminal.
5 Notwithstanding
the provisions of paragraph 2 of this regulation the segregated ballast
conditions for oil tankers less than 150 metres in length shall be
to the satisfaction of the Administration.
Crude oil tankers of 40,000 tonnes
deadweight and above delivered on or before 1 June 1982
6 Subject
to the provisions of paragraph 7 of this regulation every crude oil
tanker of 40,000 tonnes deadweight and above delivered on or before
1 June 1982, as defined in regulation
1.28.3, shall be provided with segregated ballast tanks and
shall comply with the requirements of paragraphs 2 and 3 of this regulation.
7 Crude
oil tankers referred to in paragraph 6 of this regulation may, in
lieu of being provided with segregated tanks operate with a cargo
tank cleaning procedure using crude oil washing in accordance with
regulation 33 and 35 of this Annex unless the crude
oil tanker is intended to carry crude oil which is not suitable for
crude oil washing.
Product carriers of 40,000 tonnes
deadweight and above delivered on or before 1 June 1982
8 Every product carrier
of 40,000 tonnes deadweight and above delivered on or before 1 June
1982, as defined in regulation
1.28.3, shall be provided with segregated ballast tanks and
shall comply with the requirements of paragraphs 2 and 3 of this regulation,
or alternatively operate with dedicated clean ballast tanks in accordance
with the following provisions:
-
.1 The product carrier shall have adequate tank
capacity, dedicated solely to the carriage of clean ballast as defined
in regulation 1.17 of this
Annex, to meet the requirements of paragraphs 2 and 3 of this regulation.
-
.2 The arrangements and operational procedures
for dedicated clean ballast tanks shall comply with the requirements
established by the Administration. Such requirements shall contain
at least all the provisions of the revised Specifications for Oil
Tankers with Dedicated Clean Ballast Tanks adopted by the Organization
by resolution A.495(XII).
-
.3 The product carrier shall be equipped with
an oil content meter, approved by the Administration on the basis
of specifications recommended by the Organization, to enable supervision
of the oil content in ballast water being discharged. footnote
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SEE INTERPRETATION 36
-
.4 Every product carrier operating with dedicated
clean ballast tanks shall be provided with a Dedicated Clean Ballast
Tank Operation Manual footnote detailing
the system and specifying operational procedures. Such a Manual shall
be to the satisfaction of the Administration and shall contain all
the information set out in the Specifications referred to in subparagraph
8.2 of this regulation. If an alteration affecting the dedicated clean
ballast tank system is made, the Operation Manual shall be revised
accordingly.
An oil tanker qualified as a segregated
ballast oil tanker
9 Any oil
tanker which is not required to be provided with segregated ballast
tanks in accordance with paragraphs 1, 6 or 8 of this regulation may,
however be qualified as a segregated ballast tanker, provided that
it complies with the requirements of paragraphs 2 and 3 or 5 as appropriate,
of this regulation.
Oil tankers delivered on or before
1 June 1982 having special ballast arrangements
10 Oil
tankers delivered on or before 1 June 1982, as defined in regulation 1.28.3, having special
ballast arrangements.
-
.1 Where an oil tanker delivered on or before
1 June 1982, as defined in regulation
1.28.3, is so constructed or operates in such a manner that
it complies at all times with the draught and trim requirements set
out in paragraph 2 of this regulation without recourse to the use
of ballast water, it shall be deemed to comply with the segregated
ballast tank requirements referred to in paragraph 6 of this regulation,
provided that all of the following conditions are complied with:
-
.1 operational procedures and ballast arrangements
are approved by the Administration;
-
.2 agreement is reached between the Administration
and the Governments of the port States Parties to the present convention
concerned when the draught and trim requirements are achieved through
an operational procedure; and
-
.3 the International Oil Pollution Prevention
Certificate is endorsed to the effect that the oil tanker is operating
with special ballast arrangements.
-
.2 In no case shall ballast water be carried in
oil tanks except on those rare voyages when weather conditions are
so severe that, in the opinion of the master, it is necessary to carry
additional ballast water in cargo tanks for the safety of the ship.
Such additional ballast water shall be processed and discharged in
compliance with regulation 34 of
this Annex and in accordance with the requirements of regulations 29, 31 and 32 of this
Annex, and entry shall be made in the Oil Record Book referred to
in regulation 36 of this
Annex.
-
.3 An Administration which has endorsed a Certificate
in accordance with subparagraph 10.1.3 of this regulation shall communicate
to the Organization the particulars thereof for circulation to the
Parties to the present Convention.
Oil tankers of 70,000 tonnes deadweight
and above delivered after 31 December 1979
11 Oil
tankers of 70,000 tonnes deadweight and above delivered after 31 December
1979, as defined in regulation
1.28.2, shall be provided with segregated ballast tanks and
shall comply with paragraphs 2, 3 and 4 or paragraph 5 as appropriate
of this regulation.
Protective location of segregated
ballast
12 Protective
location of segregated ballast spaces.
In every crude oil tanker of 20,000 tonnes deadweight and above
and every product carrier of 30,000 tonnes deadweight and above delivered
after 1 June 1982, as defined in regulation
1.28.4, except those tankers that meet regulation 19, the segregated ballast
tanks required to provide the capacity to comply with the requirements
of paragraph 2 of this regulation, which are located within the cargo
tank length, shall be arranged in accordance with the requirements
of paragraphs 13, 14 and 15 of this regulation to provide a measure
of protection against oil outflow in the event of grounding or collision.
13 Segregated ballast
tanks and spaces other than oil tanks within the cargo tanks length
(Lt) shall be so arranged as to comply with the following
requirement:
ΣPA
c + ΣPA
s ≥ J[L
t(B + 2D)]
where:
PA
c
|
= |
the side shell area in square metres for each segregated ballast
tank or space other than an oil tank based on projected moulded dimensions, |
PA
s
|
= |
the bottom shell area in square metres for each such tank or
space based on projected moulded dimensions, |
L
t
|
= |
length in metres between the forward and after extremities of
the cargo tanks, |
B
|
= |
maximum
breadth of the ship in metres as defined in regulation 1.22 of this Annex,
|
D
|
= |
moulded
depth in metres measured vertically from the top of the keel to the
top of the freeboard deck beam at side amidships. In ships having
rounded gunwales, the moulded depth shall be measured to the point
of intersection of the moulded lines of the deck and side shell plating,
the lines extending as though the gunwale were of angular design, |
J
|
= |
0.45
for oil tankers of 20,000 tonnes deadweight, 0.30 for oil tankers
of 200,000 tonnes deadweight and above, subject to the provisions
of paragraph 14 of this regulation. |
= |
For intermediate values of deadweight the value of J shall
be determined by linear interpolation.
|
Whenever symbols given in this paragraph appear in this regulation,
they have the meaning as defined in this paragraph.
14 For tankers of
200,000 tonnes deadweight and above the value of J may be reduced
as follows:
where:
a
|
= |
0.25
for oil tankers of 200,000 tonnes deadweight, |
a
|
= |
0.40
for oil tankers of 300,000 tonnes deadweight, |
a
|
= |
0.50
for oil tankers of 420,000 tonnes deadweight and above. |
|
= |
For intermediate values of deadweight the value of a shall
be determined by linear interpolation.
|
Oc
|
= |
as
defined in regulation 25.1.1 of
this Annex,
|
Os
|
= |
as
defined in regulation 25.1.2 of
this Annex,
|
OA
|
= |
the
allowable oil outflow as required by regulation 26.2 of this Annex.
|
15 In the determination
of PA
c and PA
s for
segregated ballast tanks and spaces other than oil tanks the following
shall apply:
-
.1 the minimum width of each wing tank or space
either of which extends for the full depth of the ship's side or from
the deck to the top of the double bottom shall be not less than 2
metres. The width shall be measured inboard from the ship's side at
right angles to the centreline. Where a lesser width is provided the
wing tank or space shall not be taken into account when calculating
the protecting area PA
c; and
-
.2 the minimum vertical depth of each double bottom
tank or space shall be B/15 or 2 metres, whichever is
the lesser. Where a lesser depth is provided the bottom tank or space
shall not be taken into account when calculating the protecting area PA
s.
-
The minimum width and depth of wing tanks and double bottom
tanks shall be measured clear of the bilge area and, in the case of
minimum width, shall be measured clear of any rounded gunwale area.