{"data":{"id":"us/46-cfr-172.240","jurisdiction":"us","citation":"46 CFR 172.240","heading":"Permeability of spaces.","body":"When doing the calculations required in § 172.225,\n(a) The permeability of a floodable space, other than a machinery or cargo space, must be assumed as listed in Table 172.240;\n(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\n(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.\nTable 172.240—Permeability\nSpaces and tanks Permeability (percent)\nStoreroom spaces 60\nAccommodations spaces 95\nVoids 95\nConsumable liquid tanks 1 95 or 0\nOther liquid tanks 2 95 or 0\nCargo (completely filled) 60\nCargo (empty) 95\nMachinery 85\n1 Whichever results in the more disabling condition.\n2 If tanks are partially filled, the permeability must be determined from the actual density and amount of liquid carried.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER S—SUBDIVISION AND STABILITY","PART 172—SPECIAL RULES PERTAINING TO BULK CARGOES","Subpart H—Special Rules Pertaining to Great Lakes Dry Bulk Cargo Vessels"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"abca3fb24a6b56efdee4ed84d8a300d79e0e1962a992f1207ff946c64600516e","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-172.235","next":"us/46-cfr-172.245"},"notice":"GroundRules: Original legal text. Not legal advice."}