MARPOL Consolidated Edition 2017

Chapter 4 - Requirements for the cargo area of oil tankers
Regulation 28
.2 Bottom damage:
For O.JL from
the forward
perpendicular
of the ship
Any other part
of the ship
.2.1 Longi tudinal extent: t(d) or 14.5 m, t(d) or 5 m,
whichever is less
whichever is less
.2.2 Transverse extent: B
6 or 10 m, B or 5 m,
6
whichever is less whichever is less
.2.3 Vertica l extent:
B
15 or 6 m, B or 6 m,
15
w hichever is less, whichever is less,
measured from the measured from the
moulded line of the moulded line of the
bottom shell plating bottom shell plating
at centreline
at centreline
.3 If any damage of a lesser extent than the maximum ex tent of damage specified in subparagraphs 2.1
and 2.2 of th is paragraph would result in a more severe condition, such damage shall be considered .
. 4 W here the damage involving transverse bulkheads is envisaged as specified in subparagraphs 1.1
and 1.2 of this regulation, transverse watertight bulkheads shall be spaced at least at a distance
equal to the longitudinal extent of assumed damage specified in subparagraph 2.1 of this paragraph
in order to be considered effective. Where transverse bulkheads are spaced at a lesser distance,
one or more of these bulkheads with in such extent of damage shall be assumed as non-existent for
the purpose of determining flooded compartments .
. 5 W here the damage between adjacent transverse watertight bulkheads is envisaged as specified in
subparagraph 1.3 of this regulation, no main transverse bulkhead or a transverse bulkhead bounding
side tanks or double bottom tanks shall be assumed damaged, un less:
.5.1 the spaci ng of the adjacent bulkheads is less than the longitudinal extent of assumed damage
specified in subparagraph 2.1 of this paragraph; or
.5.2 there is a step or recess in a transverse bulkhead of more than 3.05 m in length, located w ithin
the extent of penetration of assumed damage. The step formed by the after peak bulkhead
and after peak top shall not be regarded as a step for the purpose of this regulation .
. 6 If pipes, ducts or tunnels are situated w ithin the assumed extent of damage, arrangements shall
be made so that progressive flooding cannot thereby extend to compartments other than those
assumed to be floodable for each case of damage.
SEE INTERPRETATION 57
3 O il tankers shal l be regarded as complying with the damage stability criteria if the following requirements
are met:
.1 The fina l waterline, taking into account sinkage, heel and trim, shall be below the lower edge of any
opening through w hich progressive flooding may take place. Such openings shall include air-pipes
and those w hich are closed by means of weathertight doors or hatch covers and may exclude
those openings closed by means of watertight manhole covers and flush scuttles, sma ll watertight
cargo tank hatch covers which maintain the high integrity of the deck, remotely operated watertight
sliding doors, and sidescuttles of the non-opening type.
MARPOL CONSOLIDATED EDITION 2017 93