Code of Federal Regulations Title 46. Shipping § 46.174.090 Permeability of spaces

(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.

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.