(a) Design calculations must be submitted that demonstrate that the vessel will remain afloat in the conditions of equilibrium specified in Sec. 42.20-12 assuming the damage specified in Sec. 42.20-11 as applied to the following flooding standards:
(1) If the vessel is 225 meters (738 feet) or less in length, it must be able to withstand the flooding of any one compartment, except the machinery space.
(2) If the vessel is over 225 meters (738 feet) in length, it must be able to withstand the flooding of any one compartment, treating the machinery space as a floodable compartment.
(b) When doing the calculations required in paragraph (a) of this section, the following permeabilities must be assumed:
(1) 0.95 in all locations except the machinery space.
(2) 0.85 in the machinery space. [CGD 79-153, 48 FR 38648, Aug. 25, 1983]