Load Line Regulations (SOR/2007-99)
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Regulations are current to 2013-04-29 and last amended on 2007-07-01. Previous Versions
SCHEDULE 2
(Subparagraph 17(1)(c)(i))
DETERMINATION OF FREEBOARDS — DIAMOND LOAD LINES
INTERPRETATION
1. (1) The following definitions apply in this Schedule.
- “after perpendicular”
“after perpendicular” means the perpendicular taken at the after end of the length of a vessel. (perpendiculaire arrière)
- “depth for freeboard”
“depth for freeboard” or “D” means the distance equal to the moulded depth amidships plus the thickness of the stringer plate, with no allowance for sheathing. However, in the case of a vessel that does not have right-angled gunwales or that has rounded gunwales with a radius greater than four per cent of the breadth, that distance shall be adjusted so that the area of the topside section is equal to that of a vessel with right-angled gunwales and with the same round of beam. (creux de franc-bord ou D)
- “effective length”
“effective length” or “E” means,
(a) in respect of an enclosed superstructure that is not a raised quarter-deck,
(i) if it has a height of Hs or more, the length of the superstructure, or
(ii) if it has a height of less than Hs, the length of the superstructure times the quotient of the height of the superstructure divided by Hs;
(b) in respect of an enclosed superstructure that is a raised quarter-deck, the lesser of 0.6 L and
(i) if it has a height of 2/3 Hs or more, the length of the superstructure, or
(ii) if it has a height of less than 2/3 Hs, the length of the superstructure times the quotient of the height of the superstructure divided by Hs; and
(c) in respect of a trunk,
(i) if it has a height of Hs or more, the length of the trunk times the quotient of the mean breadth of the trunk divided by the breadth, or
(ii) if it has a height of less than Hs, the length of the trunk times the quotient of the mean breadth of the trunk divided by the breadth times the quotient of the height of trunk divided by Hs. (longueur effective ou E)
- “length of the superstructure”
“length of the superstructure” or “S”, in respect of a superstructure of a vessel, means the length of the part of the superstructure that is between the forward perpendicular and the after perpendicular of the vessel. (longueur de la superstructure ou S)
- “summer draught”
“summer draught” means the distance measured from the top of the keel of a vessel to the upper edge of the load line that would mark the vessel’s summer freeboard referred to in subsection 8(1). (tirant d’eau d’été)
- “trunk”
“trunk” means an efficiently constructed structure that is on a freeboard deck of a vessel and has a breadth of less than 92 per cent of the breadth of the vessel. (trunk)
(2) For the purposes of this Schedule, all length and height measurements shall be in metres and taken to three decimal places.
(3) Words and expressions used in this Schedule and defined in section 1 of Schedule 1 have the same meaning as in that section.
BASIC FREEBOARD CALCULATION
2. (1) The basic freeboard in millimetres shall be
(a) 850 × p1 × D, in the case of a Type A vessel; and
(b) 1000 × p1 × D, in the case of a Type B vessel.
(2) In subsection (1), p1 is equal to p + (L/D – L/Ds) × A for vessels that are 122 m or less in length and equal to p for vessels that are more than 122 m in length where
p is the value set out in column 2 of an item of Table 1 to this section for a length set out in column 1 or determined for a length that is intermediate to two lengths set out in column 1 of consecutive items to Table 1 by linear interpolation between those lengths;
L/D is the ratio of length to depth for freeboard except that it shall not be more than
(a) 15 if L is 122 m or less;
(b) 21 if L is 214 m or more; or
(c) the ratio obtained for intermediate lengths by linear interpolation between the ratios set out in paragraphs (a) and (b);
L/Ds is the value set out in column 2 of an item of Table 2 to this section for a length set out in column 1 or determined for a length that is intermediate to two lengths set out in column 2 of consecutive items to Table 2 by linear interpolation between those lengths; and
A is the value set out in column 2 of an item of Table 3 to this section for a length set out in column 1 or determined for a length that is intermediate to two lengths set out in column 2 of consecutive items to Table 3 by linear interpolation between those lengths.
TABLE 1
Column 1 Column 2 Item Length of Vessel (metres) Value of “p” 1. 24 0.10957 2. 26 0.11191 3. 28 0.11426 4. 30 0.11661 5. 32 0.11898 6. 34 0.12136 7. 36 0.12375 8. 38 0.12615 9. 40 0.12856 10. 42 0.13098 11. 44 0.13341 12. 46 0.13585 13. 48 0.13831 14. 50 0.14077 15. 52 0.14324 16. 54 0.14573 17. 56 0.14822 18. 58 0.15072 19. 60 0.15324 20. 62 0.15576 21. 64 0.15830 22. 66 0.16085 23. 68 0.16340 24. 70 0.16597 25. 72 0.16854 26. 74 0.17113 27. 76 0.17373 28. 78 0.17633 29. 80 0.17895 30. 82 0.18158 31. 84 0.18421 32. 86 0.18686 33. 88 0.18952 34. 90 0.19219 35. 92 0.19486 36. 94 0.19755 37. 96 0.20025 38. 98 0.20295 39. 100 0.20567 40. 102 0.20840 41. 104 0.21113 42. 106 0.21388 43. 108 0.21664 44. 110 0.21940 45. 112 0.22218 46. 114 0.22496 47. 116 0.22776 48. 118 0.23056 49. 120 0.23338 50. 122 0.23620 51. 124 0.23876 52. 126 0.24125 53. 128 0.24367 54. 130 0.24601 55. 132 0.24827 56. 134 0.25045 57. 136 0.25255 58. 138 0.25457 59. 140 0.25650 60. 142 0.25836 61. 144 0.26014 62. 146 0.26184 63. 148 0.26346 64. 150 0.26500 65. 152 0.26646 66. 154 0.26783 67. 156 0.26913 68. 158 0.27035 69. 160 0.27149 70. 162 0.27255 71. 164 0.27353 72. 166 0.27443 73. 168 0.27524 74. 170 0.27598 75. 172 0.27664 76. 174 0.27722 77. 176 0.27772 78. 178 0.27814 79. 180 0.27848 80. 182 0.27874 81. 184 0.27891 82. 186 0.27901 83. 188 0.27903 84. 190 0.27899 85. 192 0.27886 86. 194 0.27865 87. 196 0.27835 88. 198 0.27797 89. 200 0.27750 90. 202 0.27694 91. 204 0.27683 92. 206 0.27634 93. 208 0.27578 94. 210 0.27517 95. 212 0.27450 96. 214 0.27377 97. 216 0.27299 98. 218 0.27214 99. 220 0.27124 100. 222 0.27028 101. 224 0.26926 102. 226 0.26818 103. 228 0.26704 104. 230 0.26585 105. 232 0.26459 106. 234 0.26328 107. 236 0.26191 108. 238 0.26049 109. 240 0.25900 110. 242 0.25746 111. 244 0.25585 112. 246 0.25402 113. 248 0.25218 114. 250 0.25034 115. 252 0.24850 116. 254 0.24667 117. 256 0.24483 118. 258 0.24299 119. 260 0.24115 120. 262 0.23932 121. 264 0.23748 122. 266 0.23564 123. 268 0.23381 124. 270 0.23197 125. 272 0.23013 126. 274 0.22829 127. 276 0.22646 128. 278 0.22462 129. 280 0.22278 130. 282 0.22094 131. 284 0.21911 132. 286 0.21727 133. 288 0.21543 134. 290 0.21360 135. 292 0.21176 136. 294 0.20992 137. 296 0.20808 138. 298 0.20625 139. 300 0.20441 140. 302 0.20257 141. 304 0.20073 142. 306 0.19890 TABLE 2
Column 1 Column 2 Item Length of Vessel (metres) Value of “L/Ds” 1. 24 6.46654 2. 26 6.64083 3. 28 6.81513 4. 30 6.98942 5. 32 7.16372 6. 34 7.33801 7. 36 7.51231 8. 38 7.68660 9. 40 7.86089 10. 42 8.03519 11. 44 8.20948 12. 46 8.38378 13. 48 8.55807 14. 50 8.73237 15. 52 8.90666 16. 54 9.08096 17. 56 9.25525 18. 58 9.42955 19. 60 9.60384 20. 62 9.77814 21. 64 9.95243 22. 66 10.12672 23. 68 10.30102 24. 70 10.47531 25. 72 10.64961 26. 74 10.82390 27. 76 10.99820 28. 78 11.17249 29. 80 11.34679 30. 82 11.52108 31. 84 11.69538 32. 86 11.86967 33. 88 12.04397 34. 90 12.21826 35. 92 12.39255 36. 94 12.56685 37. 96 12.74114 38. 98 12.91544 39. 100 13.08973 40. 102 13.26403 41. 104 13.43832 42. 106 13.61262 43. 108 13.78691 TABLE 3
Column 1 Column 2 Item Length of Vessel (metres) Value of “A” 1. 24 0.008714 2. 26 0.008330 3. 28 0.007954 4. 30 0.007587 5. 32 0.007228 6. 34 0.006878 7. 36 0.006537 8. 38 0.006204 9. 40 0.005880 10. 42 0.005564 11. 44 0.005257 12. 46 0.004959 13. 48 0.004669 14. 50 0.004388 15. 52 0.004115 16. 54 0.003851 17. 56 0.003596 18. 58 0.003349 19. 60 0.003111 20. 62 0.002882 21. 64 0.002661 22. 66 0.002449 23. 68 0.002245 24. 70 0.002050 25. 72 0.001863 26. 74 0.001686 27. 76 0.001516 28. 78 0.001356 29. 80 0.001204 30. 82 0.001060 31. 84 0.000926 32. 86 0.000800 33. 88 0.000682 34. 90 0.000573 35. 92 0.000473 36. 94 0.000381 37. 96 0.000298 38. 98 0.000223 39. 100 0.000158 40. 102 0.000100 41. 104 0.000052 42. 106 0.000012 43. 108 0.000000
CORRECTION FOR TYPE B VESSELS
3. The basic freeboard for a Type B vessel that is less than 153 m in length and has enclosed superstructures with an effective length of not more than a quarter of the length of the vessel shall be increased by b millimetres where
b = 2.5 × (153 – L) × (0.25 – E/L)
CORRECTION FOR SUPERSTRUCTURES AND TRUNKS
4. (1) If the sum of the effective lengths of the enclosed superstructures equals L, the basic freeboard shall be reduced by x millimetres where
x = (Hs × 500)
(2) If the sum of the effective lengths of the enclosed superstructures and trunks in respect of which the requirements set out in subsection (3) are met is less than L, the basic freeboard shall be reduced by x millimetres where
x = (E/2 L) × (1 + E/L) × (Hs × 500)
(3) The requirements referred to in subsection (2) are the following:
(a) the trunk shall be at least as strong as an enclosed superstructure;
(b) no hatchways shall be in the freeboard deck in way of the trunk other than small access openings with watertight covers;
(c) the trunk deck shall be a permanent working platform fitted with guardrails;
(d) if the trunk is detached, it shall be connected to the adjacent superstructures by permanent gangways;
(e) guardrails shall be fitted in way of the trunk on the weather parts of the freeboard deck for at least half the length of exposed parts of the trunk;
(f) the trunk shall have a breadth at least 60 per cent of the breadth of the vessel; and
(g) if there is no superstructure on the vessel, the length of the trunk shall be at least 60 per cent of its length.
CORRECTION FOR SHEER
5. Correction in the basic freeboard for sheer shall be determined in accordance with regulation 38 of the 1966 Convention. However, for the purpose of the determination, L shall be the lesser of the length of the vessel and 153 m.
CORRECTION FOR BOW HEIGHT
6. (1) The following definitions apply in this section.
- “assumed bow height”
“assumed bow height”, in respect of a vessel, means the vertical distance at the forward perpendicular between
(a) the top of the exposed deck at side; and
(b) the water line that corresponds to the basic freeboard, as corrected in accordance with sections 3 to 6, where applicable, including any designed trim. (hauteur d’étrave présumée)
- “standard bow height”
“standard bow height” means
(a) 49.417 L × (1 – L/500) mm for a vessel of less than 168 m in length; or
(b) 8677 – 18.917 L mm for a vessel of 168 m or more in length. (hauteur d’étrave normale)
(2) Subject to subsections (3) and (4), if the assumed bow height is less than the standard bow height, the basic freeboard shall be increased by the difference.
(3) For the purpose of the definition “assumed bow height”, the top of the exposed deck at side is deemed not to include sheer or the height of a superstructure unless
(a) in the case of sheer, it extends for at least 15 per cent of the length of the vessel measured from the forward perpendicular; and
(b) in the case of the height of a superstructure, the superstructure is enclosed and extends from the stem to a point at least 0.06 L abaft the forward perpendicular.
CORRECTION FOR DECK LINE
7. (1) If the position of the upper edge of the deck line is placed in accordance with paragraph 2(b) of Schedule 3 above the position established by paragraph 2(a) of that Schedule, the basic freeboard shall be increased by the difference between those positions.
(2) If the position of the upper edge of the deck line is placed in accordance with paragraph 2(b) of Schedule 3 below the position established by paragraph 2(a) of that Schedule, the basic freeboard shall be decreased by the difference between those positions.
FRESH WATER FREEBOARDS
8. (1) The summer freeboard that is applicable during the summer season in fresh water shall be the freeboard determined in accordance with sections 2 to 7.
(2) The midsummer freeboard that is applicable during the midsummer season in fresh water shall be determined by deducting y millimetres from the summer freeboard where y is equal to the summer draught in metres multiplied by 25.
(3) The intermediate freeboard that is applicable during the intermediate season in fresh water shall be determined by adding y millimetres to the summer freeboard where y is equal to the summer draught in metres multiplied by the quotient of 2540 divided by the greater of 122 m and L.
(4) The winter freeboard that is applicable during the winter season in fresh water shall be determined by adding y millimetres to the summer freeboard where y is equal to the summer draught in metres multiplied by the quotient of 5080 divided by the greater of 122 m and L.
SALT WATER FREEBOARDS
9. (1) Salt water freeboards that are applicable to vessels that operate in salt water shall be determined by adding y millimetres to the corresponding fresh water freeboards where y is equal to the displacement in fresh water in tonnes at the summer load waterline divided by the product of 4.1 times the tonnes per centimetre immersion in fresh water at the summer load waterline.
(2) If the displacement in fresh water in tonnes at the summer load waterline cannot be determined, one forty-eighth of the summer draught shall be added to the corresponding fresh water freeboards.
MINIMUM FREEBOARD
10. Despite sections 8 and 9, the freeboard other than the open-hopper dredge freeboard shall not be less than 50 mm.
OPEN-HOPPER DREDGES
11. (1) The dredging freeboard for open-hopper dredges shall be 62.5 per cent of the summer freeboard for a type B vessel or 150 mm, whichever is greater.
(2) The dredging freeboard for an open-hopper dredge is applicable only when
(a) the dredge is operating not more than 20 nautical miles from the mouth of a harbour of safe refuge;
(b) the height of waves in the area of operation is not more than 3 m or the wind velocity in the area is not more than 65 km per hour; and
(c) the dredge is carrying dredged material with a specific gravity that is not greater than the highest specific gravity of dredged material that the dredge is designed to dredge.
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