46 CFR 45.59 - Definitions for superstructure corrections.

View all text of Subpart C [§ 45.51 - § 45.77]

§ 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).

(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.