[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: 46CFR174.320]

[Page 180]
 
                           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 I--Hopper Dredges With Working Freeboard Assignments
 
Sec. 174.320  Damage survival.

    A hopper dredge survives assumed damage if it meets the following 
conditions:
    (a) The maximum angle of heel in each stage of flooding must not 
exceed 30 degrees or the angle of downflooding whichever is less.
    (b) The final waterline, taking into account sinkage, heel, and 
trim, must be below the lowest edge of each opening through which 
progressive flooding may take place.
    (c) The righting arm curve calculated after damage must:
    (1) Have a minimum positive range of 20 degrees beyond the angle of 
equilibrium; and
    (2) Reach a height of at least 4 inches (l00mm) within the 20 degree 
positive range.
    (d) Each opening within, or partially within, the 20 degree range 
beyond the angle of equilibrium must be weathertight.
    (e) After flooding or equalization as allowed by Sec. 174.325, the 
hopper dredge's metacentric height must be at least 2 inches (50mm) when 
the dredge is in an upright position.