§174.320. Damage survival.
46 C.F.R. § 174.320
A hopper dredge survives assumed damage if it meets the following conditions:
The maximum angle of heel in each stage of flooding must not exceed 30 degrees or the angle of downflooding whichever is less.
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.
The righting arm curve calculated after damage must—
Have a minimum positive range of 20 degrees beyond the angle of equilibrium; and
Reach a height of at least 4 inches (l00mm) within the 20 degree positive range.
Each opening within, or partially within, the 20 degree range beyond the angle of equilibrium must be weathertight.
After flooding or equalization as allowed by § 174.325, the hopper dredge's metacentric height must be at least 2 inches (50mm) when the dredge is in an upright position.
Notes, amendments, and revision history
Source
Source: CGD 76-080, 54 FR 36977, Sept. 6, 1989, unless otherwise noted.
Authority
Authority: 42 U.S.C. 9118, 9119, 9153; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1. Section 174.180 also issued under sec. 617, Pub. L. 111-281, 124 Stat. 2905.
Source
Source: CGD 79-023, 48 FR 51048, Nov. 4, 1983, unless otherwise noted.