View all text of Subpart C [§ 174.030 - § 174.100]
§ 174.090 - Permeability of spaces.
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
| 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.