46 C.F.R. § 42.20-60

Current through September 30, 2024

Section 42.20-60 - 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 superstructures1	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 deduction¹]

	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.

46 C.F.R. §42.20-60

CGFR 68-60, 33 FR 10065, July 12, 1968, as amended by CGFR 68-126, 34 FR 9015, June 5, 1969; USCG-2014-0688, 79 FR 58280, Sept. 29, 2014