When doing the calculations required in § 174.065—

1. (a) The permeability of a floodable space, other than a machinery space, must be as listed in Table 174.090; and

2. (b) Calculations in which a machinery space is treated as a floodable space must be based on an assumed machinery space permeability of 85%, unless the use of an assumed permeability of less than 85% is justified in detail.

   Table 174.090—Permeability

   Spaces and tanks	Permeability (percent)
   Storeroom spaces	60.
   Accommodation spaces	95.
   Voids	95.
   Consumable liquid tanks	95 or 0. 1
   Other liquid tanks	95 or 0. 2
   1 Whichever results in the more disabling condition.
   2 If tanks are partially filled, the permeability must be determined from the actual density and amount of liquid carried.