3.2 Damage assumptions

  3.2.1 Damage should be assumed to occur anywhere in the vessels length between transverse watertight bulkheads.

  3.2.2 The assumed extent of damage should be as follows:

• .1 longitudinal extent:

  • .1 for a vessel the keel of which is laid or which is at a similar stage of construction^footnote before 22 November 2012:

    with length (L) not greater than 43 m: 10% of L; and

    with length (L) greater than 43 m: 3 m plus 3% of L;

  • .2 for a vessel the keel of which is laid or which is at a similar stage of construction on or after 22 November 2012:

    with length (L) not greater than 43 m: 10% of L;

    with length (L) greater than 43 m and less than 80 m: 3 m plus 3% of L; and

    with length (L) from 80 m to 100 m: 1/3L^2/3;

• .2 transverse extent:

  • .1 for a vessel the keel of which is laid or which is at a similar stage of construction before 22 November 2012:

    760 mm measured inboard from the side of the vessel perpendicularly to the centreline at the level of the summer load waterline;

  • .2 for a vessel the keel of which is laid or which is at a similar stage of construction on or after 22 November 2012:

    with length (L) less than 80 m: 760 mm; and

    with length (L) from 80 m to 100 m: B/20, but not less than 760 mm;

    The transverse extent should be measured inboard from the side of the vessel perpendicularly to the centreline at the level of the summer load waterline; and

• .3 vertical extent:

  from the underside of the cargo deck, or the continuation thereof, for the full depth of the vessel.

  3.2.3 For a vessel the keel of which is laid or which is at a similar stage of construction:

• .1 before 22 November 2012:

  A transverse watertight bulkhead extending from the vessel's side to a distance inboard of 760 mm or more at the level of the summer load line joining longitudinal watertight bulkheads may be considered as a transverse watertight bulkhead for the purpose of the damage calculations.

• .2 on or after 22 November 2012:

  For a vessel with length (L) less than 80 m, a transverse watertight bulkhead extending from the vessel's side to a distance inboard of 760 mm or more at the level of the summer load line joining longitudinal watertight bulkheads may be considered as a transverse watertight bulkhead for the purpose of the damage calculations. For a vessel with length (L) from 80 m to 100 m, a transverse watertight bulkhead extending from the vessel's side to a distance inboard of B/20 or more (but not less than 760 mm) at the level of the summer load line joining longitudinal watertight bulkheads may be considered as a transverse watertight bulkhead for the purpose of the damage calculations.

  3.2.4 If pipes, ducts or tunnels are situated within the assumed extent of damage, arrangements should be made to ensure that progressive flooding cannot thereby extend to compartments other than those assumed to be floodable for each case of damage.

  3.2.5 If damage of a lesser extent than that specified in 3.2.2 results in a more severe condition, such lesser extent should be assumed.

  3.2.6 Where a transverse watertight bulkhead is located within the transverse extent of assumed damage and is stepped in way of a double bottom or side tank by more than 3.05 m, the double bottom or side tanks adjacent to the stepped portion of the transverse watertight bulkhead should be considered as flooded simultaneously.

  3.2.7 If the distance between adjacent transverse watertight bulkheads or the distance between the transverse planes passing through the nearest stepped portions of the bulkheads is less than the longitudinal extent of damage given in 3.2.2.1, only one of these bulkheads should be regarded as effective for the purpose of 3.2.1.