TITLE 46 - SHIPPING

CHAPTER I - COAST GUARD, DEPARTMENT OF HOMELAND SECURITY

SUBCHAPTER E - LOAD LINES

PART 45 - GREAT LAKES LOAD LINES

subpart c - FREEBOARDS

45.61 - Correction for superstructures and trunks.

  (a) 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.

  (b) 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: Percentage=(E/2L) (1+E/L)100 (c) To be eligible for the correction a trunk must (1) Be at least as strong and as stiff as a superstructure; (2) Have no opening in the freeboard deck in way of the trunk, except small access openings; (3) Have hatchway coamings and covers that meet 45.143 through 45.147; (4) Provide a permanent working platform fore and aft with guardrails; (5) Provide fore and aft access between detached trunks and superstructures by permanent gangways; (6) Be at least 60 percent of the breadth of the ship in way of the trunk; and (7) Be at least 0.6 L in length, if no superstructure, is provided.