[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR172.240]

[Page 157]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 172--SPECIAL RULES PERTAINING TO BULK CARGOES--Table of Contents
 
   Subpart H--Special Rules Pertaining to Great Lakes Dry Bulk Cargo 
                                 Vessels
 
Sec. 172.240  Permeability of spaces.

    When doing the calculations required in Sec. 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
------------------------------------------------------------------------
                                                          Permeability
                   Spaces and tanks                        (percent)
------------------------------------------------------------------------
Storeroom spaces.....................................          60
Accommodations spaces................................          95
Voids................................................          95
Consumable liquid tanks..............................  \1\ 95 or 0
Other liquid tanks...................................  \2\ 95 or 0
Cargo (completely filled)............................          60
Cargo (empty)........................................          95
Machinery............................................         85
------------------------------------------------------------------------
\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.