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e-CFR data is current as of October 16, 2020

Title 46Chapter ISubchapter EPart 45Subpart C → §45.59


Title 46: Shipping
PART 45—GREAT LAKES LOAD LINES
Subpart C—Freeboards


§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 23 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 23 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
800.1100
900.1136
1000.1172
1100.1208
1200.1244
1300.1281
1400.1318
1500.1355
1600.1393
1700.1430
1800.1468
1900.1506
2000.1545
2100.1583
2200.1622
2300.1661
2400.1700
2500.1740
2600.1780
2700.1820
2800.1860
2900.1900
3000.1941
3100.1982
3200.2023
3300.2065
3400.2106
3500.2148
3600.2190
3700.2233
3800.2275
3900.2318
4000.2361
4100.2400
4200.2437
4300.2472
4400.2506
4500.2537
4600.2567
4700.2595
4800.2621
4900.2645
5000.2667
5100.2688
5200.2706
5300.2723
5400.2738
5500.2751
5600.2762
5700.2772
5800.2779
5900.2785
6000.2788
6100.2790
6200.2790
6300.2789
6400.2785
6500.2779
6600.2772
6700.2768
6800.2760
6900.2751
7000.2740
7100.2728
7200.2715
7300.2700
7400.2684
7500.2667
7600.2648
7700.2628
7800.2607
7900.2584
8000.2560
8100.2532
8200.2504
8300.2476
8400.2448
8500.2420
8600.2392
8700.2364
8800.2336
8900.2308
9000.2280
9100.2252
9200.2224
9300.2196
9400.2168
9500.2140
9600.2112
9700.2084
9800.2056
9900.2028
10000.2000

Table 12(2)

values of “a” for use in the expression

Length of Ship (feet)Value of “A”
800.00864
900.00806
1000.00750
1100.00696
1200.00644
1300.00594
1400.00546
1500.00500
1600.00456
1700.00414
1800.00374
1900.00336
2000.00300
2100.00266
2200.00234
2300.00204
2400.00176
2500.00150
2600.00126
2700.00104
2800.00084
2900.00066
3000.00050
3100.00036
3200.00024
3300.00014
3400.00006
3500.00000

Table 12(3)

values of l/ds

Length of Ship (feet)Value of L/D5
806.50000
906.76563
1007.03125
1107.29688
1207.56250
1307.82813
1408.09375
1508.35938
1608.62500
1708.89063
1809.19625
1909.42188
2009.68750
2109.95313
22010.21875
23010.48438
24010.75000
25011.01563
26011.28125
27011.54688
28011.81250
29012.07813
30012.34375
31012.60938
32012.87500
33013.14063
34013.40625
35013.67188
36013.93750
37014.20313
38014.46875
39014.73438
40015.00000

(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.

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