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Load Line Regulations (SOR/2007-99)

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Regulations are current to 2019-08-28 and last amended on 2013-12-06. 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 1 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 1 of consecutive items to Table 3 by linear interpolation between those lengths.

      TABLE 1

      ItemColumn 1Column 2
      Length of Vessel (metres)Value of “p”
      1240.10957
      2260.11191
      3280.11426
      4300.11661
      5320.11898
      6340.12136
      7360.12375
      8380.12615
      9400.12856
      10420.13098
      11440.13341
      12460.13585
      13480.13831
      14500.14077
      15520.14324
      16540.14573
      17560.14822
      18580.15072
      19600.15324
      20620.15576
      21640.15830
      22660.16085
      23680.16340
      24700.16597
      25720.16854
      26740.17113
      27760.17373
      28780.17633
      29800.17895
      30820.18158
      31840.18421
      32860.18686
      33880.18952
      34900.19219
      35920.19486
      36940.19755
      37960.20025
      38980.20295
      391000.20567
      401020.20840
      411040.21113
      421060.21388
      431080.21664
      441100.21940
      451120.22218
      461140.22496
      471160.22776
      481180.23056
      491200.23338
      501220.23620
      511240.23876
      521260.24125
      531280.24367
      541300.24601
      551320.24827
      561340.25045
      571360.25255
      581380.25457
      591400.25650
      601420.25836
      611440.26014
      621460.26184
      631480.26346
      641500.26500
      651520.26646
      661540.26783
      671560.26913
      681580.27035
      691600.27149
      701620.27255
      711640.27353
      721660.27443
      731680.27524
      741700.27598
      751720.27664
      761740.27722
      771760.27772
      781780.27814
      791800.27848
      801820.27874
      811840.27891
      821860.27901
      831880.27903
      841900.27899
      851920.27886
      861940.27865
      871960.27835
      881980.27797
      892000.27750
      902020.27694
      912040.27683
      922060.27634
      932080.27578
      942100.27517
      952120.27450
      962140.27377
      972160.27299
      982180.27214
      992200.27124
      1002220.27028
      1012240.26926
      1022260.26818
      1032280.26704
      1042300.26585
      1052320.26459
      1062340.26328
      1072360.26191
      1082380.26049
      1092400.25900
      1102420.25746
      1112440.25585
      1122460.25402
      1132480.25218
      1142500.25034
      1152520.24850
      1162540.24667
      1172560.24483
      1182580.24299
      1192600.24115
      1202620.23932
      1212640.23748
      1222660.23564
      1232680.23381
      1242700.23197
      1252720.23013
      1262740.22829
      1272760.22646
      1282780.22462
      1292800.22278
      1302820.22094
      1312840.21911
      1322860.21727
      1332880.21543
      1342900.21360
      1352920.21176
      1362940.20992
      1372960.20808
      1382980.20625
      1393000.20441
      1403020.20257
      1413040.20073
      1423060.19890

      TABLE 2

      ItemColumn 1Column 2
      Length of Vessel (metres)Value of “L/Ds
      1246.46654
      2266.64083
      3286.81513
      4306.98942
      5327.16372
      6347.33801
      7367.51231
      8387.68660
      9407.86089
      10428.03519
      11448.20948
      12468.38378
      13488.55807
      14508.73237
      15528.90666
      16549.08096
      17569.25525
      18589.42955
      19609.60384
      20629.77814
      21649.95243
      226610.12672
      236810.30102
      247010.47531
      257210.64961
      267410.82390
      277610.99820
      287811.17249
      298011.34679
      308211.52108
      318411.69538
      328611.86967
      338812.04397
      349012.21826
      359212.39255
      369412.56685
      379612.74114
      389812.91544
      3910013.08973
      4010213.26403
      4110413.43832
      4210613.61262
      4310813.78691

      TABLE 3

      ItemColumn 1Column 2
      Length of Vessel (metres)Value of “A”
      1240.008714
      2260.008330
      3280.007954
      4300.007587
      5320.007228
      6340.006878
      7360.006537
      8380.006204
      9400.005880
      10420.005564
      11440.005257
      12460.004959
      13480.004669
      14500.004388
      15520.004115
      16540.003851
      17560.003596
      18580.003349
      19600.003111
      20620.002882
      21640.002661
      22660.002449
      23680.002245
      24700.002050
      25720.001863
      26740.001686
      27760.001516
      28780.001356
      29800.001204
      30820.001060
      31840.000926
      32860.000800
      33880.000682
      34900.000573
      35920.000473
      36940.000381
      37960.000298
      38980.000223
      391000.000158
      401020.000100
      411040.000052
      421060.000012
      431080.000000

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 exposed 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.

  • SOR/2013-235, ss. 25, 26(E), 27(F)
 
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