For certain ships the requirement contained in paragraph
2.2.3 of part A of the Code may not be practicable. Such ships are
typically of wide beam and small depth, indicatively B/D ≥ 2.5.
For such ships Administrations may apply the following alternative
criteria:
-
.1 the maximum righting lever (GZ) should occur
at an angle of heel not less than 15°; and
-
.2 the area under the curve of righting levers
(GZ curve) should not be less than 0.070 metre-radians up to an angle
of 15° when the maximum righting lever (GZ) occurs at 15°
and 0.055 metre-radians up to an angle of 30° when the maximum
righting lever (GZ) occurs at 30° or above. Where the maximum
righting lever (GZ) occurs at angles of between 15° and 30°,
the corresponding area under the righting lever curve should be:
-
0.055 + 0.001 (30° - ϕmax) metre-radiansfootnote.