[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: 46CFR172.245]

[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. 172.245  Survival conditions.

    A vessel is presumed to survive assumed damage if it meets the 
following conditions in the final stage of flooding:
    (a) Final waterline. The final waterline, in the final condition of 
sinkage, heel, and trim must be below the lower edge of an opening 
through which progressive flooding may take place, such as an air pipe, 
or an opening that is closed by means of a weathertight door or hatch 
cover. This opening does not include an opening closed by a:
    (1) Watertight manhole cover;
    (2) Flush scuttle;
    (3) Small watertight cargo tank hatch cover that maintains the high 
integrity of the deck;
    (4) Class 1 door in a watertight bulkhead;
    (5) Remotely operated sliding watertight door;
    (6) Side scuttle of the nonopening type;
    (7) Retractable inflatable seal; or
    (8) Guillotine door.
    (b) Heel angle. The maximum angle of heel must not exceed 15 
degrees, except that this angle may be increased to 17 degrees if no 
deck edge immersion occurs.
    (c) Range of stability. Through an angle of 20 degrees beyond its 
position of equilibrium after flooding, a vessel must meet the following 
conditions:
    (1) The righting arm curve must be positive.
    (2) The maximum righting arm must be at least 4 inches (10 cm).
    (3) Each submerged opening must be weathertight
    (d) Metacentric height. After flooding, the metacentric height must 
be at least 2 inches (50 mm) when the vessel is in the equilibrium 
position.
    (e) Progressive flooding. In the design calculations required by 
Sec. 172.225, progressive flooding between spaces connected by pipes, 
ducts or tunnels must be assumed unless:
    (1) Pipes within the assumed extent of damage are equipped with 
arrangements such as stop check valves to prevent progressive flooding 
to other spaces with which they connect; and,
    (2) Progressive flooding through ducts or tunnels is protected 
against by:
    (i) Retractable inflatable seals to cargo hopper gates; or
    (ii) Guillotine doors in bulkheads in way of the conveyor belt.