[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: 46CFR174.085]

[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. 174.085  Flooding on column stabilized units.

    (a) Watertight compartments that are outboard of, or traversed by, a 
plane which connects the vertical centerlines of the columns on the 
periphery of the unit, and within 5 feet (1.5 meters) of an outer 
surface of a column or footing on the periphery of the unit, must be 
assumed to be subject to flooding as follows:
    (1) When a column is subdivided into watertight compartments by 
horizontal watertight flats, all compartments in the column within 5 
feet (1.5 meters) of the unit's waterline before damage causing flooding 
must be assumed to be subject to simultaneous flooding.
    (2) When a column is subdivided into watertight compartments by 
vertical watertight bulkheads, each two adjacent compartments must be 
assumed subject to simultaneous flooding if the distance between the 
vertical watertight bulkheads, measured at the column periphery, is 
equal to or less than one-eighth of the column perimeter at the draft 
under consideration.
    (3) When a column is subdivided into watertight compartments by 
horizontal watertight flats and vertical watertight bulkheads, those 
compartments that are within the bounds described in paragraph (a)(2) of 
this section and within 5 feet (1.5 meters) of the unit's waterline 
before damage causing flooding must be assumed to be subject to 
simultaneous flooding.
    (b) Each compartment in a footing must be assumed to be subject to 
individual flooding when any part of the compartment is within 5 feet 
(1.5 meters) of the unit's waterline before damage causing flooding.