§45.61. Correction for superstructures and trunks.
46 C.F.R. § 45.61
Where the effective length E of superstructures and trunks that meet the requirements of subpart D of this part is 1.0L, the minimum summer freeboard may be corrected by subtracting 1/2Hs.
Where the effective length of superstructures and trunks is less than 1.0L the minimum summer freeboard may be corrected by subtracting a percentage of one-half of the standard superstructure height (Hs) determined by the formula:
To be eligible for the correction a trunk must—
Be at least as strong and as stiff as a superstructure;
Have no opening in the freeboard deck in way of the trunk, except small access openings;
Have hatchway coamings and covers that meet §§ 45.143 through 45.147;
Provide a permanent working platform fore and aft with guardrails;
Provide fore and aft access between detached trunks and superstructures by permanent gangways;
Be at least 60 percent of the breadth of the ship in way of the trunk; and
Be at least 0.6 L in length, if no superstructure, is provided.
Notes, amendments, and revision history
Authority
Authority: 46 U.S.C. 5104, 5108; Department of Homeland Security Delegation No. 0170.1.
Source
Source: CGD 73-49R, 38 FR 12290, May 10, 1973, unless otherwise noted.