Federal regulations · Through 2026-08-25 · Newer source version available

46 CFR 42.20-60: -60 Deduction for superstructures and trunks.

(a) Where the effective length of superstructures and trunks is 1.0L, the deduction from the freeboard shall be 14 inches at 79 feet length of vessel, 34 inches at 279 feet length, and 42 inches at 400 feet length and above; deductions at intermediate lengths shall be obtained by linear interpolation.
(b) Where the total effective length of superstructures and trunks is less than 1.0L the deduction shall be a percentage obtained from table 42.20-60(b)(1) or table 42.20-60(b)(2):
Table 42.20-60(b)(1)—Percentage of Deduction For Type “A” Vessels
Total effective length of superstructures and trunks
0 0.1L 0.2L 0.3L 0.4L 0.5L 0.6L 0.7L 0.8L 0.9L 1.0L
Percentage of deduction for all types of superstructures 1 0 7 14 21 31 41 52 63 75.3 87.7 100
1 Percentages at intermediate lengths of superstructures and trunks shall be obtained by linear interpolation.
Table 42.20-60(b)(2)—Percentage of Deduction for Type “B” Vessels
[Percentage of deduction 1]
Total effective length of superstructures and trunks
Line 0 0.1L 0.2L 0.3L 0.4L 0.5L 0.6L 0.7L 0.8L 0.9L 1.0L
Vessels with forecastle and without detached bridge I 0 5 10 15 23.5 32 46 63 75.3 87.7 100
Vessels with forecastle and detached bridge II 0 6.3 12.7 19 27.5 36 46 63 75.3 87.7 100
1 Percentages at intermediate lengths of superstructures and trunks shall be obtained by linear interpolation.
(c) For vessels of Type “B”:
(1) Where the effective length of a bridge is less than 0.2L, the percentages shall be obtained by linear interpolation between lines I and II;
(2) Where the effective length of a forecastle is more than 0.4L, the percentages shall be obtained from line II; and,
(3) Where the effective length of a forecastle is less than 0.07L, the percentages in table 42.20-60(b)(2) of this paragraph shall be reduced by:
5(0.07L−f)/0.07L
L is the length of vessel as defined in § 42.13-15(a),
f is the effective length of the forecastle.

Where this section sits in the code

Title 46—Shipping
CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
SUBCHAPTER E—LOAD LINES
PART 42—DOMESTIC AND FOREIGN VOYAGES BY SEA
Subpart 42.20—Freeboards

(b) Where the total effective length of superstructures and trunks is less than 1.0L the deduction shall be a percentage obtained from table 42.20-60(b)(1) or table 42.20-60(b)(2):

Table 42.20-60(b)(1)—Percentage of Deduction For Type “A” Vessels

Total effective length of superstructures and trunks

0 0.1L 0.2L 0.3L 0.4L 0.5L 0.6L 0.7L 0.8L 0.9L 1.0L

Percentage of deduction for all types of superstructures 1 0 7 14 21 31 41 52 63 75.3 87.7 100

1 Percentages at intermediate lengths of superstructures and trunks shall be obtained by linear interpolation.

Table 42.20-60(b)(2)—Percentage of Deduction for Type “B” Vessels

[Percentage of deduction 1]

Total effective length of superstructures and trunks

Line 0 0.1L 0.2L 0.3L 0.4L 0.5L 0.6L 0.7L 0.8L 0.9L 1.0L

Vessels with forecastle and without detached bridge I 0 5 10 15 23.5 32 46 63 75.3 87.7 100

Vessels with forecastle and detached bridge II 0 6.3 12.7 19 27.5 36 46 63 75.3 87.7 100

1 Percentages at intermediate lengths of superstructures and trunks shall be obtained by linear interpolation.

(1) Where the effective length of a bridge is less than 0.2L, the percentages shall be obtained by linear interpolation between lines I and II;

(2) Where the effective length of a forecastle is more than 0.4L, the percentages shall be obtained from line II; and,

(3) Where the effective length of a forecastle is less than 0.07L, the percentages in table 42.20-60(b)(2) of this paragraph shall be reduced by:

5(0.07L−f)/0.07L

L is the length of vessel as defined in § 42.13-15(a),

f is the effective length of the forecastle.

Collected 2026-08-27T02:26:22Z. Source file · JSON

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