Loading (50 kb)...'
(continued)
510.......................................................... 80.9
520.......................................................... 82.7
530.......................................................... 84.5
540.......................................................... 86.3
550.......................................................... 88.0
560.......................................................... 89.6
570.......................................................... 91.1
580.......................................................... 92.6
590.......................................................... 94.1
600.......................................................... 95.5
610.......................................................... 96.9
620.......................................................... 98.3
630.......................................................... 99.6
640.......................................................... 100.9
650.......................................................... 102.1
660.......................................................... 103.3
670.......................................................... 104.4
680.......................................................... 105.5
690.......................................................... 106.6
700.......................................................... 107.7
710.......................................................... 108.7
720.......................................................... 109.7
730.......................................................... 110.7
740.......................................................... 111.7
750.......................................................... 112.6
760.......................................................... 113.5
770.......................................................... 114.4
780.......................................................... 115.3
790.......................................................... 116.1
800.......................................................... 117.0
810.......................................................... 117.8
820.......................................................... 118.6
830.......................................................... 119.3
840.......................................................... 120.1
850.......................................................... 120.7
860.......................................................... 121.4
870.......................................................... 122.1
880.......................................................... 122.7
890.......................................................... 123.4
900.......................................................... 124.0
910.......................................................... 124.6
920.......................................................... 125.2
930.......................................................... 125.7
940.......................................................... 126.2
950.......................................................... 126.7
960.......................................................... 127.2
970.......................................................... 127.7
980.......................................................... 128.1
990.......................................................... 128.6
1,000........................................................ 129.0
1,010........................................................ 129.4
1,020........................................................ 129.9
1,030........................................................ 130.3
1,040........................................................ 130.7
1,050........................................................ 131.0
1,060........................................................ 131.4
1,070........................................................ 131.7
1,080........................................................ 132.0
1,090........................................................ 132.3
1,100........................................................ 132.6
1,110........................................................ 132.9
1,120........................................................ 133.2
1,130........................................................ 133.5
1,140........................................................ 133.8
1,150........................................................ 134.0
1,160........................................................ 134.3
1,170........................................................ 134.5
1,180........................................................ 134.7
1,190........................................................ 135.0
1,200........................................................ 135.2
1,200 \2\.................................................... .........
------------------------------------------------------------------------
\1\ Freeboards at intermediate lengths of vessels shall be obtained by
linear interpolation.
\2\ Vessels above 1,200 feet in length shall be dealt with by the
Commandant.
(b) Type B vessels. (1) The tabular freeboard for Type B vessels shall be determined from Table 42.2015(b)(1):
Table 42.20-15(b)(1)_Freeboard Table for Type ``B'' Vessels
------------------------------------------------------------------------
Freeboard
Length of vessel (feet) \1\
(inches)
------------------------------------------------------------------------
80........................................................... 8.0
90........................................................... 8.9
100.......................................................... 9.8
110.......................................................... 10.8
120.......................................................... 11.9
130.......................................................... 13.0
140.......................................................... 14.2
150.......................................................... 15.5
160.......................................................... 16.9
170.......................................................... 18.3
180.......................................................... 19.8
190.......................................................... 21.3
200.......................................................... 22.9
210.......................................................... 24.7
220.......................................................... 26.6
230.......................................................... 28.5
240.......................................................... 30.4
250.......................................................... 32.4
260.......................................................... 34.4
270.......................................................... 36.5
280.......................................................... 38.7
290.......................................................... 41.0
300.......................................................... 43.3
310.......................................................... 45.7
320.......................................................... 48.2
330.......................................................... 50.7
340.......................................................... 53.2
350.......................................................... 55.7
360.......................................................... 58.2
370.......................................................... 60.7
380.......................................................... 63.2
390.......................................................... 65.7
400.......................................................... 68.2
410.......................................................... 70.7
420.......................................................... 73.2
430.......................................................... 75.7
440.......................................................... 78.2
450.......................................................... 80.7
460.......................................................... 83.1
470.......................................................... 85.6
480.......................................................... 88.1
490.......................................................... 90.6
500.......................................................... 93.1
510.......................................................... 95.6
520.......................................................... 98.1
530.......................................................... 100.6
540.......................................................... 103.0
550.......................................................... 105.4
560.......................................................... 107.7
570.......................................................... 110.0
580.......................................................... 112.3
590.......................................................... 114.6
600.......................................................... 116.8
610.......................................................... 119.0
620.......................................................... 121.1
630.......................................................... 123.2
640.......................................................... 125.3
650.......................................................... 127.3
660.......................................................... 129.3
670.......................................................... 131.3
680.......................................................... 133.3
690.......................................................... 135.3
700.......................................................... 137.1
710.......................................................... 139.0
720.......................................................... 140.9
730.......................................................... 142.7
740.......................................................... 144.5
750.......................................................... 146.3
760.......................................................... 148.1
770.......................................................... 149.8
780.......................................................... 151.5
790.......................................................... 153.2
800.......................................................... 154.8
810.......................................................... 156.4
820.......................................................... 158.0
830.......................................................... 159.6
840.......................................................... 161.2
850.......................................................... 162.8
860.......................................................... 164.3
870.......................................................... 165.9
880.......................................................... 167.4
890.......................................................... 168.9
900.......................................................... 170.4
910.......................................................... 171.8
920.......................................................... 173.3
930.......................................................... 174.7
940.......................................................... 176.1
950.......................................................... 177.5
960.......................................................... 178.9
970.......................................................... 180.3
980.......................................................... 181.7
990.......................................................... 183.1
1,000........................................................ 184.4
1,010........................................................ 185.8
1,020........................................................ 187.2
1,030........................................................ 188.5
1,040........................................................ 189.8
1,050........................................................ 191.0
1,060........................................................ 192.3
1,070........................................................ 193.5
1,080........................................................ 194.8
1,090........................................................ 196.1
1,100........................................................ 197.3
1,110........................................................ 198.6
1,120........................................................ 199.9
1,130........................................................ 201.2
1,140........................................................ 202.3
1,150........................................................ 203.5
1,160........................................................ 204.6
1,170........................................................ 205.8
1,180........................................................ 206.9
1,190........................................................ 208.1
1,200........................................................ 209.3
1,200 \2\.................................................... .........
------------------------------------------------------------------------
\1\ Freeboards at intermediate lengths of vessel shall be obtained by
linear interpolation.
\2\ Vessels above 1,200 feet in length shall be dealt with by the
Commandant.
[CGFR 6860, 33 FR 10064, July 12, 1968, as amended by CGFR 68126, 34 FR 9015, June 5, 1969]
§ 42.20-20 Correction to the freeboard for vessels under 328 feet in length.
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(a) The tabular freeboard for a Type B vessel of between 79 feet and 328 feet in length having enclosed superstructures with an effective length of up to 35 percent of the length of the vessel shall be increased by:
0.09 (328-L) [0.35-(E/L)] inches
where:
L=length of vessel in feet.
E=effective length of superstructure in feet as defined in §42.2050.
[CGFR 6860, 33 FR 10064, July 12, 1968]
§ 42.20-25 Correction for block coefficient.
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If the block coefficient (Cb) exceeds 0.68, the tabular freeboard specified in §42.2015 as modified, if applicable, by §§42.205 (b) and (d), and 42.2020(a) must be multiplied by the factor (Cb+0.68)/1.36.
[CGD 79153, 48 FR 38650, Aug. 25, 1983]
§ 42.20-30 Correction for depth.
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(a) Where D exceeds L 1/15 the freeboard shall be increased by [D-(L/15)] R inches, where R is L/131.2 at lengths less than 393.6 feet and 3 at 393.6 feet length and above.
(b) Where D is less than L/15 no reduction shall be made except in a vessel with an enclosed superstructure covering at least 0.6L amidships, with a complete trunk, or combination of detached enclosed superstructures and trunks which extend all fore and aft, where the freeboard shall be reduced at the rate prescribed in paragraph (a) of this section.
(c) Where the height of superstructure or trunk is less than the standard height, the reduction shall be in the ratio of the actual to the standard height as defined in §42.2040.
[CGFR 6860, 33 FR 10064, July 12, 1968]
§ 42.20-35 Correction for position of deck line.
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(a) Where the actual depth to the upper edge of the deck line is greater or less than D, the difference between the depths shall be added to or deducted from the freeboard.
[CGFR 6860, 33 FR 10065, July 12, 1968]
§ 42.20-40 Standard height of superstructure.
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(a) The standard height of a superstructure shall be as given in Table 42.2040(a):
Table 42.20-40(a) Standard Heights (in Feet) \1\
------------------------------------------------------------------------
Raised All other
Length (L) (in feet) quarter super
deck structures
------------------------------------------------------------------------
98.5 or less...................................... 3.0 5.9
246............................................... 3.9 5.9
410 or more....................................... 5.9 7.5
------------------------------------------------------------------------
\1\ The standard heights at intermediate lengths of the vessel shall be
obtained by linear interpolation.
[CGFR 6860, 33 FR 10065, July 12, 1968, as amended by CGFR 68126, 34 FR 9015, June 5, 1969]
§ 42.20-45 Length of superstructure.
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(a) Except as provided in paragraph (b) of this section, the length of a superstructure (S) shall be the mean length of the parts of the superstructure which lie within the length (L).
(b) Where the end bulkhead of an enclosed superstructure extends in a fair convex curve beyond its intersection with the superstructure sides, the length of the superstructure may be increased on the basis of an equivalent plane bulkhead. This increase shall be two-thirds of the fore and aft extent of curvature. The maximum curvature which may be taken into account in determining this increase is one-half the breadth of the superstructure at the point of intersection of the curved end of the superstructure with its side.
[CGFR 6860, 33 FR 10065, July 12, 1968, as amended by CGFR 68126, 34 FR 9015, June 5, 1969]
§ 42.20-50 Effective length of superstructure.
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(a) Except as provided for in paragraph (b) of this section the effective length (E) of an enclosed superstructure of standard height shall be its length.
(b) In all cases where an enclosed superstructure of standard height is set in from the sides of the vessel as permitted in §42.1315(j), the effective length shall be the length modified by the ratio of b/Bs,
where:
b is the breadth of the superstructure at the middle of its length;
Bs is the breadth of the vessel at the middle of the length of the superstructure.
(1) Where a superstructure is set in for a part of its length, this modification shall be applied only to the set in part.
(c) Where the height of an enclosed superstructure is less than the standard height, the effective length shall be its length reduced in the ratio of the actual height to the standard height. Where the height exceeds the standard, no increase shall be made to the effective length of the superstructure.
(d) The effective length of a raised quarter deck if fitted with an intact front bulkhead, shall be its length up to a maximum of 0.6L. Where the bulkhead is not intact, the raised quarter deck shall be treated as a poop of less than standard height.
(e) Superstructures which are not enclosed shall have no effective length.
[CGFR 6860, 33 FR 10065, July 12, 1968]
§ 42.20-55 Trunks.
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(a) A trunk or similar structure which does not extend to the sides of the vessel shall be regarded as efficient on the following conditions:
(1) The trunk is at least as strong as a superstructure;
(2) The hatchways are in the trunk deck, and the hatchway coamings and covers comply with the requirements of §§42.1515 to 42.1530, inclusive, and the width of the trunk deck stringer provides a satisfactory gangway and sufficient lateral stiffness; however, small access openings with watertight covers may be permitted in the freeboard deck;
(3) A permanent working platform fore and aft fitted with guard rails is provided by the trunk deck, or by detached trunks connected to superstructures by efficient permanent gangways;
(4) Ventilators are protected by the trunk by watertight covers or by other equivalent means;
(5) Open rails are fitted on the weather parts of the freeboard deck in way of the trunk for at least half their length;
(6) The machinery casings are protected by the trunk, by a superstructure of at least standard height, or by a deckhouse of the same height and of equivalent strength;
(7) The breadth of the trunk is at least 60 percent of the breadth of the vessel; and,
(8) Where there is no superstructure, the length of the trunk is at least 0.6L.
(b) The full length of an efficient trunk reduced in the ratio of its mean breadth to B shall be its effective length.
(c) The standard height of a trunk is the standard height of a superstructure other than a raised quarter deck.
(d) Where the height of a trunk is less than the standard height, its effective length shall be reduced in the ratio of the actual to the standard height. Where the height of hatchway coamings on the trunk deck is less than that required under §42.1525(a), a reduction from the actual height of trunk shall be made which corresponds to the difference between the actual and required height of coaming.
[CGFR 6860, 33 FR 10065, July 12, 1968, as amended by CGFR 68126, 34 FR 9015, June 5, 1969]
§ 42.20-60 Deduction for superstructures and trunks.
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(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 42.2060(b)(1) or Table 42.2060(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 0 7 14 21 31 41 52 63 75.3 87.7 100
types of superstructures \1\......
----------------------------------------------------------------------------------------------------------------
\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 I 0 5 10 15 23.5 32 46 63 75.3 87.7 100
without detached bridge....
Vessels with forecasle and II 0 6.3 12.7 19 27.5 36 46 63 75.3 87.7 100
detached bridge............
----------------------------------------------------------------------------------------------------------------
\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 42.2060(b)(2) of this paragraph shall be reduced by:
5(0.07L-f)/0.07L
L is the length of vessel as defined in §42.1315(a),
f is the effective length of the forecastle.
[CGFR 6860, 33 FR 10065, July 12, 1968, as amended by CGFR 68126, 34 FR 9015, June 5, 1969]
§ 42.20-65 Sheer.
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(a) General. (1) The sheer shall be measured from the deck at side to a line of reference drawn parallel to the keel through the sheer line amidships.
(2) In vessels designed with a rake of keel, the sheer shall be measured in relation to a reference line drawn parallel to the design load waterline.
(3) In flush deck vessels and in vessels with detached superstructures the sheer shall be measured at the freeboard deck.
(4) In vessels with topsides of unusual form in which there is a step or break in the topsides, the sheer shall be considered in relation to the equivalent depth amidships.
(5) In vessels with a superstructure of standard height which extends over the whole length of the freeboard deck, the sheer shall be measured at the superstructure deck. Where the height exceeds the standard the least difference (Z) between the actual and standard heights shall be added to each end ordinate. Similarly, the intermediate ordinates at distances of 1/6L and 1/3L from each perpendicular shall be increased by 0.444Z and 0.111Z respectively.
(6) Where the deck of an enclosed superstructure has at least the same sheer as the exposed freeboard deck, the sheer of the enclosed portion of the freeboard deck shall not be taken into account.
(7) Where an enclosed poop or forecastle is of standard height with greater sheer than that of the freeboard deck, or is of more than standard height, an addition to the sheer of the freeboard deck shall be made as provided in paragraph (c)(4) of this section.
(b) Standard sheer profile. (1) The ordinates of the standard sheer profile are given in Table 42.2065(b)(1):
Table 42.20-65(b)(1)_Standard Sheer Profile
[Where L is in feet]
----------------------------------------------------------------------------------------------------------------
Station Ordinate (in inches) Ordinate (in inches) Factor
----------------------------------------------------------------------------------------------------------------
After half......................... After Perpendicular.. 0.1.................. L+10................. 1
\1/6\ L from A.P..... 0.0444............... L+4.44............... 3
\1/3\ L from A.P..... 0.0111............... L+1.11............... 3
Amidships............ ..................... 0.................... 1
----------------------------------------------------------------------------------------------------------------
Forward half....................... Amidships............ ..................... 0.................... 1
\1/3\ L from F.P..... 0.0222............... L+2.22............... 3
\1/6\ L from F.P..... 0.0888............... L+8.88............... 3
Forward Perpendicular 0.2.................. L+20................. 1
----------------------------------------------------------------------------------------------------------------
(c) Measurement of variation from standard sheer profile. (1) Where the sheer profile differs from the standard, the four ordinates of each profile in the forward or after half shall be multiplied by the appropriate factors given in the table of ordinates. The difference between the sums of the respective products and those of the standard divided by 8 measures the deficiency or excess of sheer in the forward or after half. The arithmetical mean of the excess or deficiency in the forward and after halves measures the excess or deficiency of sheer.
(2) Where the after half of the sheer has an excess and the forward half of the sheer has a deficiency, no credit shall be allowed for the part in excess and deficiency only shall be measured.
(3) Where the forward half of the sheer profile exceeds the standard, and the after portion of the sheer profile is not less than 75 percent of the standard, credit shall be allowed for the part in excess; where the after part is less than 50 percent of the standard, no credit shall be given for the excess sheer forward. Where the after sheer is between 50 percent and 75 percent of the standard, intermediate allowances may be granted for excess sheer forward.
(4) Where sheer credit is given for a poop or forecastle, the following formula shall be used:
s=(y/3)(L'/L)
where:
s=sheer credit, to be deducted from the deficiency or added to the excess of sheer.
y=difference between actual and standard height of superstructure at the end ordinate.
L'=mean enclosed length of poop or forecastle up to a maximum length of 0.5L.
L=length of vessel as defined in §42.1315(a).
(i) The formula in this paragraph (c)(4) of this section provides a curve in the form of a parabola tangent to the actual sheer curve at the freeboard deck and intersecting the end ordinate at a point below the superstructure deck a distance equal to the standard height of a superstructure. The superstructure deck shall not be less than standard height above this curve at any point. This curve shall be used in determining the sheer profile for forward and after halves of the vessel.
(d) Correction for variations from standard sheer profile. (1) The correction for sheer shall be the deficiency or excess of sheer (see paragraphs (c) (1) to (4) inclusive of this section) multiplied by:
0.75-(S/2L)
where:
S is the total length of enclosed superstructures.
(e) Addition for deficiency in sheer. (1) Where the sheer is less than the standard, the correction for deficiency in sheer (see paragraph (d)(1) of this section) shall be added to the freeboard.
(f) Deduction for excess sheer. (1) In vessels where an enclosed superstructure covers 0.1L before and 0.1L abaft amidships, the correction for excess of sheer as calculated under the provisions of paragraph (d)(1) of this section shall be deducted from the freeboard; in vessels where no enclosed superstructure covers amidships, no deduction shall be made from the freeboard; where an enclosed superstructure covers less than 0.1L before and 0.1L abaft amidships, the deduction shall be obtained by linear interpolation. The maximum deduction for excess sheer shall be at the rate of 1 1/2 inches per 100 feet of length.
[CGFR 6860, 33 FR 10066, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969]
§ 42.20-70 Minimum bow height.
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(a) The bow height defined as the vertical distance at the forward perpendicular between the waterline corresponding to the assigned summer freeboard and the designed trim and the top of the exposed deck at side shall be not less than:
(1) For vessels below 820 feet in length,
0.672L[1-(L/1640)][1.36/(Cb+0.68)] inches;
where:
L is the length of the vessel in feet.
Cb is the block coefficient which is to be taken as not less than 0.68.
(2) For vessels of 820 feet and above in length,
275.6[1.36/(Cb+0.68)] inches;
where:
Cb is the block coefficient which is to be taken as not less than 0.68.
(b) Where the bow height required in paragraph (a) of this section is obtained by sheer, the sheer shall extend for at least 15 percent of the length of the vessel measured from the forward perpendicular. Where it is obtained by fitting a superstructure, such superstructure shall extend from the stem to a point at least 0.07L abaft the forward perpendicular, and it shall comply with the following requirements:
(1) For vessels not over 328 feet in length it shall be enclosed as defined in §42.1315(j); and,
(2) For vessels over 328 feet in length it need not comply with §42.1315(j) but shall be fitted with closing appliances to the satisfaction of the assigning authority.
(c) Vessels which, to suit exceptional operational requirements, cannot meet the requirements of paragraphs (a) and (b) of this section may be given special consideration by the assigning authority.
[CGFR 6860, 33 FR 10066, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969]
§ 42.20-75 Minimum freeboards.
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(a) Summer freeboard. (1) The minimum freeboard in summer must be the freeboard derived from the tables in §42.2015 as modified by the corrections in §§42.203 and 42.205, as applicable, and §§42.2020, 42.2025, 42.2030, 42.2035, 42.2060, 42.2065 and, if applicable, §42.2070.
(2) The freeboard in salt water, as calculated in accordance with paragraph (a)(1) of this section, but without the correction for deck line, as provided by §42.2035, shall not be less than 2 inches. For vessels having in position 1 hatchways with covers which do not comply with the requirements of §§42.1525(d)(1), 42.1530, or 42.1580, the freeboard shall be not less than 6 inches.
(b) Tropical freeboard. (1) The minimum tropical freeboard shall be the freeboard obtained by a deduction from the summer freeboard of one forty-eighth of the summer draft measured from the top of the keel to the center of the ring of the load line mark.
(2) The freeboard in salt water, as calculated in accordance with paragraph (b)(1) of this section, but without the correction for deck line, as provided by §42.2035, shall not be less than 2 inches. For vessels having in position 1 hatchways with covers which do not comply with the requirements of §42.1525(d)(1), §42.1530, or §42.1580, the freeboard shall be not less than 6 inches.
(c) Winter freeboard. (1) The minimum winter freeboard shall be the freeboard obtained by an addition to the summer freeboard of one forty-eighth of summer draft, measured from the top of the keel to the center of the ring of the load line mark.
(d) Winter North Atlantic freeboard. (1) The minimum freeboard for vessels of not more than 328 feet in length which enter any part of the North Atlantic defined in §42.3035 during the winter seasonal period shall be the winter freeboard plus 2 inches. For other vessels the winter North Atlantic freeboard shall be the winter freeboard.
(e) Fresh water freeboard. (1) The minimum freeboard in fresh water of unit density shall be obtained by deducting from the minimum freeboard in salt water:
(?/40 T) inches
where:
?=displacement in salt water in tons at the summer load waterline; and,
T=tons per inch immersion in salt water at the summer load waterline.
(2) Where the displacement at the summer load waterline cannot be certified, the deduction shall be one forty-eighth of summer draft, measured from the top of the keel to the center of the ring of the load line mark.
[CGFR 6860, 33 FR 10066, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969; CGD 79153, 48 FR 38650, Aug. 25, 1983]
Subpart 42.25Special Requirements for Vessels Assigned Timber Freeboards
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§ 42.25-1 Application of this subpart.
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(a) The provisions of this subpart 42.25 apply only to vessels to which timber load lines are assigned.
[CGFR 6860, 33 FR 10067, July 12, 1968]
§ 42.25-5 Definitions of terms used in this subpart.
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(a) Timber deck cargo. The term timber deck cargo means a cargo of timber carried on an uncovered part of a freeboard or superstructure deck. The term does not include wood pulp or similar cargo.
(b) Timber load line. A timber deck cargo may be regarded as giving a vessel a certain additional buoyancy and a greater degree of protection against the sea. For that reason, vessels carrying a timber deck cargo may be granted a reduction of freeboard calculated according to the provisions of §42.2520 and marked on the vessel's side in accordance with the provisions of §42.1330(c) and (d). However, in order that such special freeboard may be granted and used, the timber deck cargo shall comply with certain conditions which are laid down in §42.2515, and the vessel itself shall also comply with certain conditions relating to its construction which are set out in §42.2510.
[CGFR 6860, 33 FR 10067, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969]
§ 42.25-10 Construction of vessel.
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(a) Superstructure. (1) Vessels, shall have a forecastle of at least standard height and a length of at least 0.07L. In addition, if the vessel is less than 328 feet in length, a poop of at least standard height, or a raised quarter deck with either a deckhouse or a strong steel hood of at least the same total height shall be fitted aft.
(b) Double bottom tanks. (1) Double bottom tanks where fitted within the midship half length of the vessel shall have adequate watertight longitudinal subdivision.
(c) Bulwarks. (1) The vessel shall be fitted either with permanent bulwarks at least 39 1/2 inches in height, specially stiffened on the upper edge and supported by strong bulwark stays attached to the deck and provided with necessary freeing ports, or with efficient rails of the same height and of specially strong construction.
[CGFR 6860, 33 FR 10067, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969]
§ 42.25-15 Stowage.
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(a) General. (1) Openings in the weather deck over which cargo is stowed shall be securely closed and battened down. The ventilators shall be efficiently protected.
(2) Timber deck cargo shall extend over at least the entire available length which is the total length of the well or wells between superstructures. Where there is no limiting superstructure at the after end, the timber shall extend at least to the after end of the aftermost hatchway. The timber shall be stowed as solidly as possible, to at least the standard height of a superstructure other than a raised quarter deck.
(3) On a vessel within a seasonal winter zone in winter, the height of the deck cargo above the weather deck shall not exceed one-third of the extreme breadth of the vessel.
(4) The timber deck cargo shall be compactly stowed, lashed, and secured. It shall not interfere in any way with the navigation and necessary work of the vessel.
(b) Upright. (1) Uprights, when required by the nature of the timber, shall be of adequate strength considering the breadth of the vessel; the spacing shall be suitable for the length and character of timber carried, but shall not exceed 9.8 feet. Strong angles or metal sockets or equally efficient means shall be provided for securing the uprights.
(c) Lashings. (1) Timber deck cargo shall be efficiently secured throughout its length by independent overall lashings spaced not more than 9.8 feet apart. Eye plates for these lashings shall be efficiently attached to the sheer strake or to the deck stringer plate at intervals of not more than 9.8 feet. The distance from an end bulkhead of a superstructure to the first eye plate shall be not more than 6.6 feet. Eye plates and lashings shall be provided 23 1/2 inches and 4.9 feet from the ends of timber deck cargoes where there is no bulkhead.
(2) Lashings shall be not less than 3/4-inch close link chain or flexible wire rope of equivalent strength, fitted with sliphooks and turnbuckles, which shall be accessible at all times. Wire rope lashings shall have a short length of long link chain to permit the length of lashings to be regulated.
(3) When timber is in lengths less than 11.8 feet the spacing of the lashings shall be reduced or other suitable provisions made to suit the length of timber.
(4) All fittings required for securing the lashings shall be of strength corresponding to the length of the lashings.
(d) Stability. (1) Provision shall be made for a safe margin of stability at all stages of the voyage, regard being given to additions of weight, such as those due to absorption of water and icing and to losses of weight such as those due to consumption of fuel and stores.
(e) Protection of crew, access to machinery spaces, etc. (1) In addition to the requirements of §42.1575(e) guardrails or life lines spaced not more than 13 inches apart vertically shall be provided on each side of the deck cargo to a height of at least 39 1/2 inches above the cargo.
(f) Steering arrangements. (1) Steering arrangements shall be effectively protected from damage by cargo and, as far as practicable, shall be accessible. Efficient provision, shall be made for steering in the event of a breakdown in the main steering arrangements.
[CGFR 6860, 33 FR 10067, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969]
§ 42.25-20 Computation for freeboard.
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(a) The minimum summer freeboards must be computed in accordance with §§42.205 (a) and (b), 42.2013, 42.2015, 42.2020, 42.2025, 42.2030, 42.2035, 42.2060, and 42.2065, except that §42.2060 is modified by substituting the percentages in Table 42.2520(a) for those given in §42.2060:
Table 42.25-20(a)_Percentage of Deduction for Superstructure
[Total Effective Length of Superstructure]
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0 0.1L 0.2L 0.3L 0.4L 0.5L 0.6L 0.7L 0.8L 0.9L 1.0L
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Percentage of deduction for all 20 31 42 53 64 70 76 82 88 94 100
types of superstructure \1\.......
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\1\ Percentages at intermediate lengths of superstructures shall be obtained by linear interpolation.
(b) The winter timber freeboard shall be obtained by adding to the summer timber freeboard one thirty-sixth of the molded summer timber draft.
(c) The winter North Atlantic timber freeboard shall be the same as the winter North Atlantic freeboard prescribed in §42.2075(d)(1).
(d) The tropical timber freeboard shall be obtained by deducting from the summer timber freeboard one forty-eighth of the molded summer timber draft.
(e) The fresh water timber freeboard shall be computed in accordance with §42.2075(e) (1) or (2) based on the summer timber load waterline.
[CGFR 6860, 33 FR 10067, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969; CGD 79153, 48 FR 38650, Aug. 25, 1983]
Subpart 42.30Zones, Areas, and Seasonal Periods
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§ 42.30-1 Basis.
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(a) The zones and areas in this subpart are, in general, based on the following criteria:
(1) Summer: not more than 10 percent winds of force 8 Beaufort (34 knots) or more.
(2) Tropical: not more than 1 percent winds of force 8 Beaufort (34 knots) or more. Not more than one tropical storm in 10 years in an area of 5° square in any 1 separate calendar month.
(b) In certain special areas, for practical reasons, some degree of relaxation has been found acceptable.
(c) A chart is attached to the International Convention on Load Lines, 1966, which illustrates the zones and areas defined in this Convention and in this subpart.
[CGFR 6860, 33 FR 10068, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969]
§ 42.30-5 Northern Winter Seasonal Zones and area.
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(a) North Atlantic Winter Seasonal Zones I and II. (1) The North Atlantic Winter Seasonal Zone I lies within the meridian of longitude 50° W. from the coast of Greenland to latitude 45° N.; thence the parallel of latitude 45° N. to longitude 15° W.; thence the meridian of longitude 15° W. to latitude 60° N.; thence the parallel of latitude 60° N. to the Greenwich Meridian, thence this meridian northwards.
(i) Seasonal periods:
Winter: October 16 to April 15.
Summer: April 16 to October 15.
(2) The North Atlantic Winter Seasonal Zone II lies within the meridian of longitude 68°30' W. from the coast of the United States to latitude 40° N.; thence the rhumb line to the point latitude 36° N., longitude 73° W.; thence the parallel of latitude 36° N. to longitude 25° W.; and thence the rhumb line to Cape Torinana. Excluded from this zone are the North Atlantic Winter Seasonal Zone I and the Baltic Sea bounded by the parallel of the latitude of The Skaw in the Skagerrak.
(i) Seasonal periods:
Winter: November 1 to March 31.
Summer: April 1 to October 31.
(b) North Atlantic Winter Seasonal Area. (1) The boundary of the North Atlantic Winter Seasonal Area is the meridian of longitude 68°30' W. from the coast of the United States to latitude 40° N.; thence the rhumb line to the southernmost intersection of the meridian of longitude 61° W. with the coast of Canada; and thence the east coasts of Canada and the United States.
(i) Seasonal periods:
(a) For vessels over 328 feet in length:
Winter: December 16 to February 15.
Summer: February 16 to December 15.
(b) For vessels of 328 feet and under in length:
Winter: November 1 to March 31.
Summer: April 1 to October 31.
(c) North Pacific Winter Seasonal Zone. The southern boundary of the North Pacific Winter Seasonal Zone is the parallel of latitude 50° N. from the east coast of the Union of Soviet Socialist Republics, to the west coast of Sakhalin; thence the west coast of Sakhalin to the southern extremity of Cape Kril'on: thence the rhumb line to Wakkanai, Hokkaido, Japan; thence the east and south coasts of Hokkaido to longitude 145° E., thence the meridian of longitude 145° E. to latitude 35° N., thence the parallel of latitude 35° N. to longitude 150° W. and thence the rhumb line to the southern extremity of Dall Island, Alaska.
(1) Seasonal periods:
Winter: October 16 to April 15.
Summer: April 16 to October 15.
[CGFR 6860, 33 FR 10068, July 12, 1968, as amended by CGFR 68126, 34 FR 9016, June 5, 1969]
§ 42.30-10 Southern Winter Seasonal Zone.
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(a) The northern boundary of the Southern Winter Seasonal Zone is the rhumb line from the east coast of the American continent at Cape Tres Puntas to the point latitude 34° S., longitude 50° W.; thence the parallel of latitude 34° S. to longitude 17° E.; thence the rhumb line to the point latitude 35°10' S., longitude 20° E.; thence the rhumb line to the point latitude 34° S. longitude 28° E.; thence along the rhumb line to the point latitude 35°30' S., longitude 118° E.; thence the rhumb line to Cape Grim on the northwest coast of Tasmania; thence along the north and east coasts of Tasmania to the southernmost point of Bruny Island; thence the rhumb line to Black Rock Point on Stewart Island; thence the rhumb line to the point latitude 47° S., longitude 170° E.; thence along the rhumb line to the point latitude 33° S., longitude 170° W.; and thence the parallel of latitude 33° S. to the west coast of the American continent.
(1) Valparaiso is to be considered as being on the boundary line of the Summer and the Winter Seasonal Zones.
(2) Seasonal periods:
Winter: April 16 to October 15.
Summer: October 16 to April 15.
[CGFR 6860, 33 FR 10068, July 12, 1968]
§ 42.30-15 Tropical Zone.
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(a) Northern boundary of the Tropical Zone. The northern boundary of the Tropical Zone is the parallel of latitude 13° N. from the east coast of the American continent to longitude 60° W.; thence the rhumb line to a point in latitude 10° N., longitude 58° W.; thence the parallel of latitude 10° N. to longitude 20° W.; thence the meridian of longitude 20° W. to latitude 30° N.; thence the parallel of latitude 30° N. to the west coast of Africa; from the east coast of Africa the parallel of latitude 8° N. to longitude 70° E.; thence the meridian of longitude 70° E. to latitude 13° N.; thence the parallel of latitude 13° N. to the west coast of India; thence around the south coast of India to latitude 10°30' N. on the east coast of India; thence the rhumb line to a point in latitude 9° N., longitude 82° E.; thence the meridian of longitude 82° E. to latitude 8° N.; thence the parallel of latitude 8° N. to the west coast of Malaysia; thence the coast of Southeast Asia to the east coast of Vietnam at latitude 10° N.; thence the parallel of latitude 10° N. to longitude 145° E.; thence the meridian of longitude 145° E. to latitude 13° N.; and thence the parallel of latitude 13° N. to the west coast of the American continent.
(1) Saigon is to be considered as being on the boundary line of the Tropical Zone and the Seasonal Tropical Area.
(b) Southern boundary of the Tropical Zone. The southern boundary of the Tropical Zone is the rhumb line from the Port of Santos, Brazil, to the point where the meridian of longitude 40° W. intersects the Tropic of Capricorn; thence the Tropic of Capricorn to the west coast of Africa; from the east coast of Africa the parallel of latitude 20° S. to the west coast of Madagascar; thence the west and north coasts of Madagascar to longitude 50° E.; thence the meridian of longitude 50° E. to latitude 10° S.; thence the parallel of latitude 10° S. to longitude 98° E.; thence the rhumb line to Port Darwin, Australia; thence the coasts of Australia and Wessel Island eastwards to Cape Wessel; thence the parallel of latitude 11° S. to the west side of Cape York; from the east side of Cape York the parallel of latitude 11° S. to longitude 150° W.; thence the rhumb line to the point latitude 26° S., longitude 75° W.; and thence the rhumb line to the west coast of the American continent at latitude 30° S. (continued)