[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: 46CFR174.090]

[Page 173]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 174--SPECIAL RULES PERTAINING TO SPECIFIC VESSEL TYPES--Table of Contents
 
  Subpart C--Special Rules Pertaining to Mobile Offshore Drilling Units
 
Sec. 174.090  Permeability of spaces.

    When doing the calculations required in Sec. 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.