32.—(1) Sufficient intact stability shall be provided in all service conditions so as to enable a ship to withstand the final stage of flooding of any one main compartment which is required to be within the floodable length.
(2) In cases where the Director considers the range of stability in the damaged condition to be doubtful, he may require investigation thereof.
(3) For the purpose of making damage stability calculations, the volume and surface permeabilities —
(a)
of the machinery space shall be taken as 85; and
(b)
of other spaces shall be taken as 95.
(4) Asymmetrical flooding is to be kept to a minimum consistent with adequate and effective arrangements.
(5) The final condition of the ship after damage and, in the case of asymmetrical flooding, after equalisation measures have been taken shall be as follows:
(a)
in the case of symmetrical flooding there shall be a positive residual metacentric height as calculated by the constant displacement method;
(b)
in the case of asymmetrical flooding the total heel shall not exceed 7 degrees, except that in special cases, the Director may allow additional heel due to the asymmetrical moment, but in no case shall the heel exceed 15 degrees; and
(c)
the margin line shall not in any case be submerged in the final stage of flooding. If it is considered that the margin line may become submerged during an intermediate stage of flooding, the Director may require such investigations and arrangements as he considers necessary for the safety of the ship.