46 CFR § 174.090
Permeability of spaces
April 15, 2021
When doing the calculations required in §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
Open Table
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 |
1Whichever results in the more disabling condition.
2If tanks are partially filled, the permeability must be determined from the actual density and amount of liquid carried.