When doing the calculations required in Sec. 174.065--
(a) The permeability of a floodable space, other than a machinery space, must be as listed in Table 174.090; and
(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.