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Electronic Code of Federal Regulations

e-CFR data is current as of December 3, 2019

Title 46Chapter ISubchapter SPart 172Subpart H → §172.240


Title 46: Shipping
PART 172—SPECIAL RULES PERTAINING TO BULK CARGOES
Subpart H—Special Rules Pertaining to Great Lakes Dry Bulk Cargo Vessels


§172.240   Permeability of spaces.

When doing the calculations required in §172.225,

(a) The permeability of a floodable space, other than a machinery or cargo space, must be assumed as listed in Table 172.240;

(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; and

(c) Calculations in which a cargo space that is completely filled is considered flooded must be based on an assumed cargo space permeability of 60% unless the use of an assumed permeability of less than 60% is justified in detail. If the cargo space is not completely filled, a cargo space permeability of 95% must be assumed unless the use of an assumed permeability of less than 95% is justified in detail.

Table 172.240—Permeability

Spaces and tanks Permeability (percent)
Storeroom spaces60
Accommodations spaces95
Voids95
Consumable liquid tanks195 or 0
Other liquid tanks295 or 0
Cargo (completely filled)60
Cargo (empty)95
Machinery85

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.

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