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Code of Federal Regulations (Last Updated: May 6, 2024) |
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Title 46 - Shipping |
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Chapter I - Coast Guard, Department of Homeland Security |
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SubChapter E - Load Lines |
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Part 45 - Great Lakes Load Lines |
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Subpart C - Freeboards |
§ 45.59 - Definitions for superstructure corrections.
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§ 45.59 Definitions for superstructure corrections.
For the purpose of §§ 45.58 through 45.61 -
(a) The standard height of a superstructure (Hs) other than a raised quarter deck and the standard height of a trunk (Hs) is determined by the formula:
Hs =[6.0 + (L/300)] ft
(b) The length of superstructure (S) is the length of those parts of the superstructure which extends to the sides of the vessel and that lie within the length (L).
(c) The effective length (E) of a trunk is its length in the ratio of its mean breadth to B.
(d) The effective length (E) of an enclosed superstructure of standard height or greater is its length “S”.
(e) Where the height of an enclosed superstructure or trunk is less than the standard height (Hs),the effective length (E) is its length reduced in the ratio of its height to Hs.
(f) The effective length (E) of a raised quarter deck of 2⁄3 Hs or greater that has no openings in the front bulkhead is its length up to a maximum of 0.6L.
(g) The effective length (E) of a raised quarter deck of less than 2⁄3 Hs or that does not have an intact front bulkhead is its length reduced by the ratio of its height to Hs.
Table 12(1)
tables of p values
Length of Ship (feet) Value of P 80 0.1100 90 0.1136 100 0.1172 110 0.1208 120 0.1244 130 0.1281 140 0.1318 150 0.1355 160 0.1393 170 0.1430 180 0.1468 190 0.1506 200 0.1545 210 0.1583 220 0.1622 230 0.1661 240 0.1700 250 0.1740 260 0.1780 270 0.1820 280 0.1860 290 0.1900 300 0.1941 310 0.1982 320 0.2023 330 0.2065 340 0.2106 350 0.2148 360 0.2190 370 0.2233 380 0.2275 390 0.2318 400 0.2361 410 0.2400 420 0.2437 430 0.2472 440 0.2506 450 0.2537 460 0.2567 470 0.2595 480 0.2621 490 0.2645 500 0.2667 510 0.2688 520 0.2706 530 0.2723 540 0.2738 550 0.2751 560 0.2762 570 0.2772 580 0.2779 590 0.2785 600 0.2788 610 0.2790 620 0.2790 630 0.2789 640 0.2785 650 0.2779 660 0.2772 670 0.2768 680 0.2760 690 0.2751 700 0.2740 710 0.2728 720 0.2715 730 0.2700 740 0.2684 750 0.2667 760 0.2648 770 0.2628 780 0.2607 790 0.2584 800 0.2560 810 0.2532 820 0.2504 830 0.2476 840 0.2448 850 0.2420 860 0.2392 870 0.2364 880 0.2336 890 0.2308 900 0.2280 910 0.2252 920 0.2224 930 0.2196 940 0.2168 950 0.2140 960 0.2112 970 0.2084 980 0.2056 990 0.2028 1000 0.2000 Table 12(2)
values of “a” for use in the expression
Length of Ship (feet) Value of “A” 80 0.00864 90 0.00806 100 0.00750 110 0.00696 120 0.00644 130 0.00594 140 0.00546 150 0.00500 160 0.00456 170 0.00414 180 0.00374 190 0.00336 200 0.00300 210 0.00266 220 0.00234 230 0.00204 240 0.00176 250 0.00150 260 0.00126 270 0.00104 280 0.00084 290 0.00066 300 0.00050 310 0.00036 320 0.00024 330 0.00014 340 0.00006 350 0.00000 Table 12(3)
values of l/ds
Length of Ship (feet) Value of L/D5 80 6.50000 90 6.76563 100 7.03125 110 7.29688 120 7.56250 130 7.82813 140 8.09375 150 8.35938 160 8.62500 170 8.89063 180 9.19625 190 9.42188 200 9.68750 210 9.95313 220 10.21875 230 10.48438 240 10.75000 250 11.01563 260 11.28125 270 11.54688 280 11.81250 290 12.07813 300 12.34375 310 12.60938 320 12.87500 330 13.14063 340 13.40625 350 13.67188 360 13.93750 370 14.20313 380 14.46875 390 14.73438 400 15.00000 (h) Superstructures which are not enclosed have no effective length.
(i) When a lower deck is designated as the freeboard deck, that part of the hull which extends above the freeboard deck is treated as a superstructure so far as concerns the application of the conditions of assignment and the calculation of freeboard.
(j) A bridge or poop is enclosed only when access is provided whereby the crew may reach accommodations, machinery, or other working spaces inside the superstructure by alternative means that are available at all times when bulkhead openings are closed.