46 CFR 174.090 - Permeability of spaces.

Regulations last checked for updates: Oct 17, 2024

Title 46 - Shipping last revised: Oct 15, 2024

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.

authority: 42 U.S.C. 9118,9119,9153; 43 U.S.C. 1333; 46 U.S.C. 3306,3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1. Section 174.180 also issued under sec. 617, Pub. L. 111-281, 124 Stat. 2905

source: CGD 79-023, 48 FR 51048, Nov. 4, 1983, unless otherwise noted.

cite as: 46 CFR 174.090