Definitions

• • 1 (1) In this Schedule,

    after perpendicular

    after perpendicular means a perpendicular that coincides with the after end of the length (L) of a ship; (perpendiculaire arrière)

    amidships

    amidships means the middle of the length (L); (milieu du navire)

    breadth (B)

    breadth (B) means the maximum breadth of a ship, measured amidships to

    • (a) the moulded line of the frame, in a ship with a metal shell, or

    • (b) the outer surface of the hull, in a ship with a shell of a material other than metal; (largeur (B))

    depth for freeboard (D)

    depth for freeboard (D) means the distance measured from the same point as moulded depth, and to the upper surface of the freeboard deck or stringer plate, with no allowance for sheathing, and in the case of a ship having a rounded gunwale with a radius greater than four per cent of the breadth (B) or having topsides of unusual form, means the depth for freeboard of a ship having a midship section with vertical topsides and with the same round of beam and area of topside section equal to that provided by the actual midship section; (creux de franc-bord (D))

    efficient trunk

    efficient trunk means a trunk or similar structure that does not extend to the sides of the ship and that meets the following requirements:

    • (a) the trunk is at least as strong as the superstructure,

    • (b) no hatchways are in the freeboard deck in way of the trunk, however, small access openings with watertight covers are permitted in the freeboard deck,

    • (c) the trunk deck stringer provides a satisfactory gangway and sufficient lateral stiffness,

    • (d) 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,

    • (e) open-rails are fitted for at least half the length of the parts of the freeboard deck in way of the trunk that are in exposed positions,

    • (f) ventilators on the freeboard deck adjacent to the trunk are capable of being closed watertight and the means of closing are permanently attached to the ventilators,

    • (g) the machinery casings are protected by the trunk, by an enclosed superstructure of at least standard height or by a deckhouse of the same height as and of strength and weathertightness equivalent to such a superstructure,

    • (h) the breadth of the trunk is at least 60 per cent of the breadth of the ship, and

      • (i) where there is no superstructure, the length of the trunk is at least 0.6 L; (trunk efficace)

    enclosed superstructure

    enclosed superstructure means a superstructure with

    • (a) enclosing bulkheads complying with the requirements of section 3 of this Schedule,

    • (b) access openings, if any, in the bulkheads fitted with doors that comply with section 4 of this Schedule,

    • (c) all other openings in the sides or ends of the superstructure fitted with efficient weathertight means of closing,

    • (d) discharges that comply with section 14 of this Schedule,

    • (e) side scuttles that comply with section 11 of this Schedule, and

    • (f) in the case of a bridge, poop or raised quarter deck, such access that the crew can reach accommodations, machinery or other working spaces inside the superstructure by alternative means that are available at all times when bulkhead openings are closed; (superstructure fermée)

    exposed position

    exposed position means a position that is

    • (a) exposed to weather and sea, or

    • (b) within a structure, so exposed, other than an enclosed superstructure; (position exposée)

    forward perpendicular

    forward perpendicular means a perpendicular that coincides with the foreside of the stem on the waterline on which the length of the ship is measured; (perpendiculaire avant)

    freeboard deck

    freeboard deck means

    • (a) the uppermost complete deck exposed to weather and sea that has permanent means of closing all openings in the exposed part thereof, and below which all openings in the sides of the ship are fitted with permanent means of watertight closing, except that where that exposed deck is stepped, the freeboard deck shall be deemed to be the line drawn along the lowest line of that exposed deck and continued parallel to the upper part of that exposed deck, or

    • (b) where the owner requests and the Assigning Authority approves, a permanent deck that is lower than the deck described in paragraph (a) and that is continuous in a fore and aft direction at least between the machinery space and peak bulkheads and continuous athwartships, except that, where that lower deck is stepped, the freeboard deck shall be deemed to be the line drawn along the lowest line of that lower deck and continued parallel to the upper part of that lower deck; (pont de franc-bord)

    height of superstructure

    height of superstructure means the least vertical height measured at the side from the top of the superstructure deck beams to the top of the freeboard deck beams; (hauteur d’une superstructure)

    intact

    intact means, in respect of a front bulkhead, without openings; (intact)

    length (L)

    length (L) means, in respect of a ship,

    • (a) 96 per cent of the total length of the ship in metres, or

    • (b) the length of the ship in metres from the foreside of the stem to the axis of the rudder stock,

      on a water line at 85 per cent of the least moulded depth measured from the top of the keel, whichever is the greater length, except that in ships designed with a rake of keel the water line on which this length is measured shall be parallel to the designed water line; (longueur (L))

    length of superstructure (S)

    length of superstructure (S) means the length of those parts of the superstructure that lie within the length (L) and extend athwartship in a straight line from side to side of the ship or to within four per cent of the breadth (B) of the ship’s side; (longueur de la superstructure (S))

    moulded depth

    moulded depth means, subject to paragraphs (a) to (d), the vertical distance measured from the top of the keel to the top of the freeboard deck beam at side, but

    • (a) in vessels of other than metal construction, the distance is measured from the lower edge of the keel rabbet,

    • (b) where the form at the lower part of the midship section is of a hollow character, or where thick garboards are fitted, the distance is measured from the point where the line of the flat of the bottom continued inwards cuts the side of the keel,

    • (c) in ships having rounded gunwales, the distance is measured to the point of intersection of the moulded lines of the deck and sides, the lines extending as though the gunwale were of angular design,

    • (d) where the freeboard deck is stepped and the raised part of the deck extends over the point at which the moulded depth is to be determined, the moulded depth shall be measured to a line of reference extending from the lower part of the deck along a line parallel with the raised part; (creux sur quille)

    Position 1

    Position 1, in respect of any structure, means an opening or fitting, in an exposed position on

    • (a) the freeboard deck or a raised quarter deck,

    • (b) a superstructure deck or a trunk deck forward of a point one-quarter of the ship’s length (L) from the forward perpendicular, or

    • (c) a trunk deck the height of which above the freeboard deck is less than standard height (Hs); (emplacement de la catégorie 1)

    Position 2

    Position 2, in respect of any structure, means an opening or fitting, in an exposed position on

    • (a) a superstructure deck, or

    • (b) a trunk deck the height of which is equal to or greater than Hs,

      abaft the point one-quarter of the ship’s length (L) from the forward perpendicular; (emplacement de la catégorie 2)

    standard height of superstructure or trunk (Hs)

    standard height of superstructure or trunk (Hs) has the same meaning as in Part II of this Schedule; (hauteur normale de superstructure ou de trunk (Hs))

    summer draught

    summer draught means the distance measured from the top of the keel of a ship to the upper edge of the load line that would mark the summer fresh water freeboard calculated in accordance with Part II of this Schedule if that freeboard were assigned to the ship; (tirant d’eau d’été)

    superstructure

    superstructure means a decked structure on the freeboard deck, part of which extends from side to side of the ship or with the side plating not being inboard of the shell plating more than four per cent of the breadth (B), and includes that part of the hull extending above the freeboard deck where the freeboard deck is a lower deck; (superstructure)

    Type A ship

    Type A ship means a ship in which

    • (a) no cargo ports or similar sideshell openings are below the freeboard deck,

    • (b) there are only small main deck openings fitted with watertight gasketed hatch covers of steel or equivalent material,

    • (c) no dimension of a main deck cargo opening is greater than 1.83 m and the total area of each such opening does not exceed 1.67 m², and

    • (d) there are no more than two main deck cargo openings to a single cargo space; (navire du type A)

    Type B ship

    Type B ship means a ship that is not a Type A ship; (navire du type B)

    watertight

    watertight means designed to withstand a specific static head of water; (étanche à l’eau)

    weathertight

    weathertight means designed to prevent water from penetrating the ship in any sea conditions. (étanche aux intempéries)

  • (2) For the purposes of this Schedule,

    • (a) the midsummer season is the period from May 1st to September 15th;

    • (b) the summer seasons are the periods from April 16th to April 30th and from September 16th to September 30th;

    • (c) the intermediate seasons are the periods from April 1st to April 15th and from October 1st to October 31st; and

    • (d) the winter season is the period from November 1st in one year to March 31st in the next year.

PART IConditions of Assignment of Freeboard

Information to be Supplied to the Master

• • 2 (1) The master of every ship shall be supplied with sufficient information, in an approved form, to enable him to arrange for the loading and ballasting of his ship in such a way as to avoid the creation of any unacceptable stresses in the ship’s structure, provided that this requirement need not apply to any particular length, design or class of ship where the Board considers it to be unnecessary.

  • (2) The master of every ship shall be supplied with sufficient information in an approved form to give him guidance as to the stability of the ship under varying conditions of service and a copy of that information shall be furnished to the Board.

Superstructure End Bulkheads

• 3 Bulkheads at exposed ends of enclosed superstructures shall be of efficient construction and shall be to the satisfaction of the Assigning Authority.

Doors

• • 4 (1) All access openings in bulkheads at ends of enclosed superstructures shall be fitted with doors of steel or other material equivalent in strength, permanently and strongly attached to the bulkhead, and framed, stiffened and fitted so that the whole structure is equivalent in strength to the unpierced bulkhead and is weathertight when closed.

  • (2) The means for securing the doors referred to in subsection (1) weathertight shall consist of gaskets and clamping devices or other equivalent means and shall be permanently attached to the bulkhead or to the doors themselves, and the doors shall be so arranged that they can be operated from both sides of the bulkhead.

  • (3) The height of the sills of access openings in bulkheads at ends of enclosed superstructures shall be at least 305 mm above the deck.

Hatchways

• • 5 (1) Subject to subsection (2), hatchway coamings shall be of substantial construction and shall be

    • (a) in the case of those coamings in Position 1, at least 460 mm above the deck; and

    • (b) in the case of those coamings in Position 2, at least 305 mm above the deck.

  • (2) The height of the coamings referred to in subsection (1) may be reduced, or the coamings may be omitted entirely, if the Board is satisfied that the safety of the ship is not thereby impaired in any sea conditions.

  • (3) Hatchways in Positions 1 and 2 shall be fitted with weathertight hatch covers of steel or other equivalent material and with gaskets and clamping devices.

  • (4) For ships 106.7 m in length or over, where weathertight covers on hatchways in Positions 1 and 2 are of mild steel, the strength shall be calculated with assumed loads not less than 12 kPa on hatchways in Position 1 and not less than 9.6 kPa on hatchways in Position 2, and the product of the maximum stress thus calculated and the factor of 4.25 shall not exceed the minimum ultimate strength of the material.

  • (5) Hatchway covers in Positions 1 and 2 shall be so designed as to limit the deflection to not more than 0.0028 times the span under the loads referred to in subsection (4) and mild steel plating forming the tops of covers shall not be less in thickness than one per cent of the spacing of stiffeners or 6 mm, whichever is the greater.

  • (6) The assumed loads on hatchways in Position 1 may be reduced to 9.6 kPa for ships 24.1 m in length and the corresponding loads on hatchways in Position 2 may be reduced to 7.2 kPa and in all cases values at intermediate lengths shall be obtained by linear interpolation.

  • (7) Coamings and hatchway covers to exposed hatchways on decks above the superstructure deck shall comply with strength requirements satisfactory to the Assigning Authority.

  • (8) The strength and stiffness of hatchway covers made of materials other than mild steel shall be equivalent to those of mild steel to the satisfaction of the Assigning Authority.

  • (9) The means for securing and maintaining weathertightness of hatch covers shall be to the satisfaction of the Assigning Authority and shall ensure that the tightness can be maintained in any sea conditions.

Cargo Ports and Other Similar Openings

• • 6 (1) Cargo ports and other similar openings in the sides of ships below the freeboard deck shall be fitted with doors or with covers so designed as to ensure watertightness and structural integrity commensurate with the surrounding shell plating.

  • (2) Cargo ports and other similar openings above the freeboard deck shall be fitted with weathertight closures and shall have structural integrity commensurate with the surrounding plating.

  • (3) The number of cargo ports and other similar openings shall be the minimum compatible with the design and proper working of the ship.

  • (4) Unless permitted by the Board, the lower edges of cargo ports and other similar openings shall not be below a line drawn parallel to the freeboard deck at side that has at its lowest point the upper edge of the uppermost load line.

Machinery Space Openings

• • 7 (1) Machinery space openings in Position 1 or 2 shall be efficiently framed and enclosed by steel casings of ample strength, and where the casings are not protected by other structures, their strength shall be to the satisfaction of the Board.

  • (2) Doorways in the casings required by subsection (1) shall be fitted with doors complying with the requirements of section 4 of this Part.

  • (3) Openings in the casings required by subsection (1) other than doorways shall be fitted with strong covers of steel or other equivalent material, permanently attached and capable of being secured weathertight from both sides of the opening and the lower edge of such openings shall be at a height above the deck of at least 305 mm.

  • (4) Any funnel or machinery space ventilator that must be kept open for the essential operations of the ship shall have coamings of a height above the deck of at least

    • (a) 3.81 m if in Position 1; and

    • (b) 1.83 m if in Position 2.

Special Conditions of Assignment for Type A Ships

• • 8 (1) Machinery casings on Type A ships shall be protected by an enclosed poop or bridge of at least standard height, or by a deckhouse of equal height and equivalent strength, provided that machinery casings may be exposed if, subject to subsection (2), there are no openings giving direct access from the freeboard deck to the machinery space.

  • (2) A door complying with the requirements of section 4 of this Part may be permitted in the machinery casing, provided that it leads to a space or passageway that is as strongly constructed as the casing and is separated from the stairway to the engine room by a second weathertight door of steel or other equivalent material.

  • (3) An efficiently constructed fore and aft permanent gangway of sufficient strength shall be fitted on Type A ships at the level of the superstructure deck between the poop and the midship bridge or deckhouse where fitted, or equivalent means of access such as passages below deck shall be provided to carry out the purpose of the gangway.

  • (4) In all places on Type A ships other than those referred to in subsection (3) and on Type A ships without a midship bridge, arrangements to the satisfaction of the Board shall be provided to safeguard the crew in reaching all exposed parts used in the essential operation of the ship.

  • (5) On Type A ships there shall be safe and satisfactory access from the gangway level between separate crew accommodations and also between crew accommodations and the machinery space.

  • (6) Exposed hatchways on the freeboard and forecastle decks or on the tops of expansion trunks on Type A ships shall be provided with efficient watertight covers of steel or other equivalent material.

  • (7) Type A ships with bulwarks shall have open rails fitted for at least half the length of the exposed parts of the exposed deck or shall have other effective freeing arrangements and the upper edge of the sheer strake shall be kept as low as practicable.

  • (8) Where superstructures on Type A ships are connected by trunks, open rails shall be fitted for the whole length of the exposed parts of the freeboard deck.

Air Pipes

• • 9 (1) Where air pipes to ballast and other tanks extend above the freeboard or superstructure decks, the exposed parts of the pipes shall be of substantial construction and the height from the deck to the point where water may have access below shall be at least 760 mm on the freeboard deck, 610 mm on raised quarter decks and 305 mm on other superstructure decks.

  • (2) Where the heights described in subsection (1) may interfere with the working of the ship, a lower height may be approved, provided the Board is satisfied that the closing arrangements and other circumstances justify a lower height.

  • (3) Satisfactory means, permanently attached, shall be provided for closing the openings of the air pipes referred to in subsection (1).

Ventilators

• • 10 (1) Ventilators in Position 1 or 2 to spaces below freeboard decks, decks of enclosed superstructures or trunk decks shall have coamings of steel or other equivalent material substantially constructed and efficiently connected to the deck.

  • (2) Subject to subsection (3), the height above the deck of the coamings required by subsection (1) shall be at least 760 mm if in Position 1 and at least 610 mm if in Position 2.

  • (3) In exposed positions, other than Positions 1 and 2, the height of ventilator coamings shall be to the satisfaction of the Assigning Authority.

  • (4) Where the coaming of any ventilator that is in an exposed position exceeds 915 mm in height above the deck, it shall be specially supported.

  • (5) Ventilators passing through superstructures other than enclosed superstructures shall have substantially constructed coamings of steel or other equivalent material at the freeboard deck.

  • (6) Subject to subsection (7), ventilator openings shall be provided with efficient weathertight closing appliances that are permanently attached to or, where permitted by the Board, conveniently stowed near the ventilators to which they are to be fitted.

  • (7) Ventilators in Position 1, the coamings of which extend to more than 3.81 m above the deck and in Position 2, the coamings of which extend to more than 1.83 m above the deck, need not be fitted with closing arrangements unless specifically required by the Board.

Side Scuttles

• • 11 (1) Side scuttles to spaces below the freeboard deck or to spaces within enclosed superstructures shall be fitted with efficient hinged inside deadlights arranged so that they can be effectively closed and secured watertight.

  • (2) No side scuttle shall be fitted in a position so that its sill is below a line drawn parallel to the freeboard deck at side and having its lowest point 2.5 per cent of the breadth (B) above the summer fresh water load water line or 510 mm, whichever is the greater distance.

  • (3) The side scuttles and deadlights shall be of substantial construction to the satisfaction of the Board.

Miscellaneous Openings in Freeboard, Superstructure and Trunk Decks

• • 12 (1) Manholes and flush scuttles in Position 1 or 2 or within a superstructure other than an enclosed superstructure shall be closed by substantial covers capable of being made watertight and, unless secured by closely spaced bolts, the covers shall be permanently attached.

  • (2) Openings in freeboard decks other than hatchways, machinery space openings, manholes and flush scuttles shall be protected by an enclosed superstructure or by a deckhouse or companionway of equivalent strength and weathertightness.

  • (3) Any opening described in subsection (2) in an exposed superstructure deck or in the top of a deckhouse on the freeboard deck that gives access to a space below the freeboard deck or a space within an enclosed superstructure shall be protected by an efficient deckhouse or companionway.

  • (4) Doorways in deckhouses or companionways described in subsections (2) and (3) shall be fitted with doors complying with the requirements of section 4 of this Part.

Freeing Ports

• • 13 (1) Where bulwarks in exposed positions on freeboard or superstructure decks form wells, ample provision shall be made for rapidly freeing the decks of water and for draining them.

  • (2) Subject to subsections (4) to (7), where the sheer in way of the well is standard or greater than standard, the minimum freeing port area on each side of the ship shall be

    • (a) “A” for each well on the freeboard deck and on the raised quarter deck, and

    • (b) one-half of “A” for each well on superstructure decks other than raised quarter decks,

    the value of “A” being given by the following formulas:

    • Where the length of bulwark (l) in the well is 20 m or less,

    “A” = 0.706 = 0.0351 l square metres.

    • Where the length of bulwark (l) in the well exceeds 20 m

    “A” = 0.0701 l square metres.

    (l need in no case be taken as greater than 0.7 L.)

  • (3) For the purposes of the freeing port area only, bulwark height shall be considered standard at 610 mm for ships 73.2 m in length or less and 1 220 mm for ships 146.3 m in length or greater and the standard bulwark height for ships of intermediate length shall be obtained by linear interpolation.

  • (4) If the height of the bulwark exceeds standard height, the minimum freeing port area shall be “A” plus 0.04 m² per metre of length of well for each metre by which the height of bulwark exceeds standard height.

  • (5) Where, in ships greater than 146.3 m in length the average height of the bulwark is less than 915 mm, the minimum freeing port area may be decreased by 0.04 m² per metre of length for each metre by which the average height of the bulwark is less than 915 mm.

  • (6) In ships with no sheer the area calculated according to subsections (2) to (5) shall be increased by 50 per cent and, where the sheer is less than the standard, the percentage of increase shall be obtained by linear interpolation.

  • (7) Where a ship is fitted with a trunk but does not comply with the requirements of paragraph (e) in the definition of “efficient trunk” or where continuous or substantially continuous hatchway side coamings are fitted between detached superstructures, the minimum area of the freeing port openings shall be calculated from the following table:

    Breadth of hatchway or trunk in relation to the breadth of ship	Area of freeing ports in relation to the total area of the bulwarks
    40 per cent or less	20 per cent
    75 per cent or more	10 per cent

    The area of freeing ports at intermediate breadths shall be obtained by linear interpolation.

  • (8) In ships having erections that are open at either or both ends, adequate provision for freeing the space within such erections shall be provided to the satisfaction of the Assigning Authority.

  • (9) The lower edges of the freeing ports shall be as near the deck as practicable and 2/3 of the freeing area required shall be provided in the half of the well nearest the lowest point of the sheer curve.

  • (10) All freeing port openings in the bulwarks shall be protected by rails or bars spaced approximately 230 mm apart.

  • (11) If shutters are fitted to freeing ports, ample clearance shall be provided to prevent jamming.

  • (12) If shutters are fitted with securing appliances, the appliances shall be of approved construction.

  • (13) Hinges for shutters shall have pins or bearings of non-corrodible material.

Scuppers, Drains, Inlets and Discharges

• • 14 (1) Every discharge led through the shell from spaces below the freeboard deck shall have

    • (a) an automatic non-return valve fitted at the shell with a positive means of closing operable

      • (i) from above the freeboard deck, or

      • (ii) from a readily accessible location, if the discharge originates in a space that is either manned or provided with continuous bilge water monitoring; or

    • (b) two automatic non-return valves, one of which shall be fitted at the shell and the inboard one of which shall always be accessible for examination under service conditions.

  • (2) Every discharge led through the shell from within an enclosed superstructure, or from within a deckhouse on the freeboard deck that is fitted with doors complying with section 4 of this Part shall

    • (a) comply with the requirements of subsection (1); or

    • (b) have an automatic non-return valve fitted at the shell, if the discharge originates in a space that is regularly visited by the crew.

  • (3) Except as provided in subsection (4), every scupper, drain and discharge originating at any level and led through the shell below a line that is either 0.05B or 610 mm, whichever is greater, above the summer fresh water load line shall have an automatic non-return valve fitted at the shell.

  • (4) The requirements of subsection (3) do not apply

    • (a) where valves are fitted in compliance with the requirements of subsection (1) or (2); or

    • (b) where the piping of the scupper, drain or discharge is of substantial thickness.

  • (5) Every scupper leading from a superstructure other than an enclosed superstructure or from a deckhouse not fitted with doors complying with the requirements of section 4 of this Part shall be led overboard.

  • (6) In machinery spaces and other readily accessible spaces every main and auxiliary sea inlet and discharge in connection with the operation of machinery shall have a valve with positive means of closing operable from a readily accessible location.

  • (7) Indicators showing whether the valve is open or closed shall be provided at the operating position of each valve, which is required by this section to have positive means of closing.

  • (8) All shell fittings and the valves required by this section shall be of steel, bronze or other approved ductile material; valves of ordinary cast iron or similar material are not acceptable.

  • (9) All pipes to which this section refers shall be of steel or other equivalent material to the satisfaction of the Board.

Protection of the Crew

• • 15 (1) The strength of the deckhouses used for the accommodation of the crew shall be to the satisfaction of the Board.

  • (2) Efficient guard-rails or bulwarks shall be fitted on all exposed parts of the freeboard and superstructure decks.

  • (3) In the case of ships with rounded gunwales the guard-rail supports shall be placed on the flat of the deck.

  • (4) The height of the bulwarks or guard-rails referred to in subsection (2) shall be at least 915 mm from the deck, provided that where this height would interfere with the normal operation or adversely influence the safety of a ship, a lesser height may be approved if the Board is satisfied that the crew is adequately protected, and the bulwarks and guard-rails shall meet the following requirements:

    • (a) guard-rails shall be fitted with at least three courses;

    • (b) the opening between the lowest course of the guard-rails and the deck shall not exceed 230 mm and other courses shall not be spaced more than 380 mm apart; and

    • (c) in cases where the sheer strake projection is at least 205 mm above the deck, two courses of rails may be fitted in lieu of three if the Board is satisfied that an equivalent degree of protection is provided.

  • (5) Life lines, gangways, underdeck passages or other similar means shall be provided for the protection of the crew in getting to and from their quarters, the machinery space and all other parts used in the essential operation of the ship.

PART IICalculation of Freeboards

Formulas

• • 16 (1) In this Part,

    effective length of superstructure or trunk (E)

    effective length of superstructure or trunk (E) means, in metres,

    • (a) S, in the case of an enclosed superstructure, other than a raised quarter deck, with a height equal to or greater than Hs,

    • (b) S × (height/Hs), in the case of an enclosed superstructure, other than a raised quarter deck, with a height less than Hs,

    • (c) S or 0.6 L, whichever is lesser, in the case of an enclosed superstructure that is a raised quarter deck with a height equal to or greater than 2/3 Hs and having an intact front bulkhead,

    • (d) S × (height/Hs), in the case of an enclosed superstructure that is a raised quarter deck with a height less than 2/3 Hs,

    • (d.1) S or 0.6 L, whichever is lesser, in the case of an enclosed superstructure that is a raised quarter deck with a height equal to or greater than 2/3 Hs and does not have an intact front bulkhead,

    • (e) length × (mean breadth/B), in the case of a trunk with a height equal to or greater than Hs, and

    • (f) length × (mean breadth/B) (height/Hs) in the case of a trunk with a height less than Hs; (longueur effective des superstructures ou des trunks (E))

    Lw

    Lw means L or 121.9 m, whichever is the greater; (Lw)

    standard height of superstructure or trunk (Hs)

    standard height of superstructure or trunk (Hs) means, in metres, 1.83 + L/300. (hauteur normale des superstructures ou des trunks (Hs))

  • (2) For the purpose of the calculations in this Part, all length and height measurements shall be in metres and shall be taken to three places of decimals.

Minimum Fresh Water Freeboards

• • 17 (1) A Type A ship shall be assigned a summer freeboard, applicable during the summer seasons in fresh water, that is not less than the basic freeboard calculated in accordance with paragraph 19(1)(a) of this Schedule and modified where appropriate in accordance with sections 21 to 24 of this Schedule.

  • (2) A Type B ship shall be assigned a summer freeboard, applicable during the summer seasons in fresh water, that is not less than the basic freeboard calculated in accordance with paragraph 19(1)(b) of this Schedule and modified where appropriate in accordance with sections 20 to 24 of this Schedule.

  • (3) A ship shall be assigned a midsummer freeboard, applicable during the midsummer season in fresh water, that is not less than the summer freeboard for that ship, calculated in accordance with this section, minus the distance in millimetres obtained by multiplying 25 by the summer draught in metres.

  • (4) A ship shall be assigned an intermediate freeboard, applicable during the intermediate seasons in fresh water, that is not less than the summer freeboard for that ship, calculated in accordance with this section, plus the distance in millimetres obtained by multiplying 2540/Lw by the summer draught in metres.

  • (5) A ship shall be assigned a winter freeboard, applicable during the winter season in fresh water, that is not less than the summer freeboard for that ship, calculated in accordance with this section, plus the distance in millimetres obtained by multiplying 5080/Lw by the summer draught in metres.

Minimum Salt Water Freeboards

• • 18 (1) Every ship that may load in salt water shall be assigned freeboards, applicable during each season in salt water, calculated by adding the quantity Δ/4.1 T millimetres to the corresponding fresh water freeboards, where Δ is the displacement in fresh water in tonnes, at the summer fresh water load water line, and T is the additional displacement in tonnes per centimetre immersion in fresh water at the summer fresh water load water line.

  • (2) Where the displacement at the summer fresh water load water line cannot be certified, the addition in millimetres to each of the minimum fresh water freeboards shall be one forty-eighth of the summer draught.

Basic Freeboards

• • 19 (1) The basic freeboard in millimetres for

    (a) a Type A ship, is 850 × ρ₁ × D, and

    (b) a Type B ship, is 1000 × ρ₁ × D,

    where

    ρ₁

    = ρ + A (L/D - L/Ds),

    ρ

    = a factor that is a function of L as determined from Table I to this section,

    L/Ds

    = the ratio of L to standard depth (Ds), as determined from Table II to this section, and

    A

    = a coefficient that is a function of L as determined from Table III to this section.

  • (2) In no case is D to be taken as less than that which will give a ratio of L to D that is

    • (a) more than 15 when L = 121.9 m or less, or

    • (b) more than 21 when L = 213.4 m or more,

      with the ratio for intermediate length being calculated proportionately.

      *Values of ρ				*Valeurs de ρ
      Length of Ship (metres)	Value of ρ	Length of Ship (metres)	Value of ρ	Length of Ship (metres)	Value of ρ	Length of Ship (metres)	Value of ρ
      –	–	–	–	–	–	–	–
      Longueur du navire (mètres)	Valeur de ρ	Longueur du navire (mètres)	Valeur de ρ	Longueur du navire (mètres)	Valeur de ρ	Longueur du navire (mètres)	Valeur de ρ
      24,4	0,1100	94,5	0,1982	164,6	0,2738	234,7	0,2628
      27,4	0,1136	97,5	0,2023	167,6	0,2751	237,7	0,2607
      30,5	0,1172	100,6	0,2065	170,7	0,2762	240,8	0,2584
      33,5	0,1208	103,6	0,2106	173,7	0,2772	243,8	0,2560
      36,6	0,1244	106,7	0,2148	176,8	0,2779	246,9	0,2532
      39,6	0,1281	109,7	0,2190	179,8	0,2785	249,9	0,2504
      42,7	0,1318	112,8	0,2233	182,9	0,2788	253,0	0,2476
      45,7	0,1355	115,8	0,2275	185,9	0,2790	256,0	0,2448
      48,8	0,1393	118,9	0,2318	189,0	0,2790	259,1	0,2420
      51,8	0,1430	121,9	0,2361	192,0	0,2789	262,1	0,2392
      54,9	0,1468	125,0	0,2400	195,1	0,2785	265,2	0,2364
      57,9	0,1506	128,0	0,2437	198,1	0,2779	268,2	0,2336
      61,0	0,1545	131,1	0,2472	201,2	0,2772	271,3	0,2308
      64,0	0,1583	134,1	0,2506	204,2	0,2768	274,3	0,2280
      67,1	0,1622	137,2	0,2537	207,3	0,2760	277,4	0,2252
      70,1	0,1661	140,2	0,2567	210,3	0,2751	280,4	0,2224
      73,2	0,1700	143,3	0,2595	213,4	0,2740	283,5	0,2196
      76,2	0,1740	146,3	0,2621	216,4	0,2728	286,5	0,2168
      79,2	0,1780	149,4	0,2645	219,5	0,2715	289,6	0,2140
      82,3	0,1820	152,4	0,2667	222,5	0,2700	292,6	0,2112
      85,3	0,1860	155,4	0,2688	225,6	0,2684	295,7	0,2084
      88,4	0,1900	158,5	0,2706	228,6	0,2667	298,7	0,2056
      91,4	0,1941	161,5	0,2723	231,6	0,2648	301,8	0,2028
      						304,8	0,2000

      	*For intermediate values of L, the value of ρ is to be obtained by linear interpolation.
      	*Les valeurs de ρ qui correspondent aux valeurs intermédiaires de L, s’obtiennent par interpolation linéaire.

      *Values of L/Ds				*Valeurs de L/Ds
      Length of Ship (metres)	Value of L/Ds	Length of Ship (metres)	Value of L/Ds	Length of Ship (metres)	Value of L/Ds	Length of Ship (metres)	Value of L/Ds
      –	–	–	–	–	–	–	–
      Longueur du navire (mètres)	Valeur de L/Ds	Longueur du navire (mètres)	Valeur de L/Ds	Longueur du navire (mètres)	Valeur de L/Ds	Longueur du navire (mètres)	Valeur de L/Ds
      24,4	6,50000	45,7	8,35938	67,1	10,21875	88,4	12,07813
      27,4	6,76563	48,8	8,62500	70,1	10,48438	91,4	12,34375
      30,5	7,03125	51,8	8,89063	73,2	10,75000	94,5	12,60938
      33,5	7,29688	54,9	9,19625	76,2	11,01563	97,5	12,87500
      36,6	7,56250	57,9	9,42188	79,2	11,28125	100,6	13,14063
      39,6	7,82813	61,0	9,68750	82,3	11,54688	103,6	13,40625
      42,7	8,09375	64,0	9,95313	85,3	11,81250	106,7	13,67188

      	*For intermediate values of L, the value of L/Ds is to be obtained by linear interpolation.
      	*Les valeurs de L/Ds qui correspondent aux valeurs intermédiaires de L, s’obtiennent par interpolation linéaire.

      *Values of “A”				*Valeurs de «A»
      Length of Ship (metres)	Value of “A”	Length of Ship (metres)	Value of “A”	Length of Ship (metres)	Value of “A”	Length of Ship (metres)		Value of “A”
      –	–	–	–	–	–	–		–
      Longueur du navire (mètres)	Valeur de «A»	Longueur du navire (mètres)	Valeur de «A»	Longueur du navire (mètres)	Valeur de «A»	Longueur du navire (mètres)		Valeur de «A»
      24,4	0,00864	45,7	0,00500	67,1	0,00234	88,4		0,00066
      27,4	0,00806	48,8	0,00456	70,1	0,00204	91,4		0,00050
      30,5	0,00750	51,8	0,00414	73,2	0,00176	94,5		0,00036
      33,5	0,00696	54,9	0,00374	76,2	0,00150	97,5		0,00024
      36,6	0,00644	57,9	0,00336	79,2	0,00126	100,6		0,00014
      39,6	0,00594	61,0	0,00300	82,3	0,00104	103,6		0,00006
      42,7	0,00546	64,0	0,00266	85,3	0,00084	106,7	or greater	0,00000
      							ou plus

      	*For intermediate values of L, the value of “A” is to be obtained by linear interpolation.
      	*Les valeurs de «A» qui correspondent aux valeurs intermédiaires de L, s’obtiennent par interpolation linéaire.

Correction for Type B Ships

• 20 The basic freeboard for a Type B ship of less than 152.4 mm in length, having enclosed superstructures with an effective length (E) of up to 25 per cent of the length (L) of the ship, shall be increased by 2.5 (152.4 - L) (0.25 - E/L), expressed in millimetres.

Correction for Superstructures and Trunks

• • 21 (1) Where the sum of the effective lengths (E) of the enclosed superstructure equals 1.0 L, the basic freeboard shall be reduced by Hs × 500 expressed in millimetres.

  • (2) Where the sum of the effective lengths (E) of enclosed superstructures and the effective lengths (E) of efficient trunks is less than 1.0 L, the basic freeboard shall be reduced by (E/2 L) (1 + E/L) (Hs × 500) expressed in millimetres.

Correction for Sheer

• • 22 (1) Subject to subsections (4) to (7), the sheer profile of a ship is the line of the freeboard deck at side.

  • (2) Subject to subsection (3), the sheer of a ship shall be measured from the deck at side to a line of reference drawn parallel to

    • (a) the keel through the sheer line at amidship; or

    • (b) in a ship designed with a rake of keel, the design load waterline.

  • (3) In a ship with a step or break in the topsides, the line of reference shall be drawn through the point amidships that represents the upper point of the mean depth of the ship.

  • (4) Subject to subsection (5), in a ship with an enclosed superstructure of at least standard height (Hs) that extends over the whole length of the freeboard deck, the sheer profile is the line of the superstructure deck at side.

  • (5) Where the height of the superstructure referred to in subsection (4) exceeds Hs, the sheer of the ship at

    • (a) the after and the forward perpendiculars shall be deemed to be increased by Z, being the least difference between Hs and the height of the superstructure,

    • (b) 1/6 L from each perpendicular shall be deemed to be increased by 0.444 Z, and

    • (c) 1/3 L from each perpendicular shall be deemed to be increased by 0.111 Z,

    and the sheer profile shall be deemed to be correspondingly altered.

  • (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 (Hs) and has greater sheer than that of the freeboard deck, or where the height of an enclosed poop or forecastle exceeds Hs, the sheer of the ship shall be deemed to be increased by the amount obtained from the following formula and the sheer profile shall be deemed to be correspondingly altered:

    y/3 × L′/L,

    where

    y

    = the difference between Hs and the height of the poop or forecastle at either perpendicular; and

    L′

    = the mean length of the poop or forecastle or 0.5L, whichever is lesser.

  • (8) The ordinates of the standard sheer profile for a station described in Column I of an item of the table to this section are set out in Column II of that item.

  • (9) Where the sheer profile of a ship differs from the standard sheer profile,

    • (a) the excess or deficiency of sheer in each half of the ship is calculated as follows:

      • (i) the ordinates of the sheer profile for each station described in Column I of an item of the table to this section shall be multiplied by the factor set out in Column III of that item and the sum of the four products for each half of the ship shall be calculated,

      • (ii) the ordinates of the standard sheer profile for each station described in Column I of an item of the table to this section shall be multiplied by the factor set out in Column III of that item and the sum of the four products for each half of the ship shall be calculated,

      • (iii) the sum described in subparagraph (ii) for the forward half of the ship shall be subtracted from the sum described in subparagraph (i) for the forward half of the ship,

      • (iv) the sum described in subparagraph (ii) for the after half of the ship shall be subtracted from the sum described in subparagraph (i) for the after half of the ship,

      • (v) the excess of sheer in each half of the ship is the positive figure, divided by eight, calculated for that half pursuant to subparagraph (iii) or (iv), as the case may be, and

      • (vi) the deficiency of sheer in each half of the ship is the negative figure, divided by eight, calculated for that half pursuant to subparagraph (iii) or (iv), as the case may be; and

    • (b) subject to subsections (10) and (11), the excess or deficiency of sheer for the ship is the positive or negative arithmetical mean, whichever is appropriate, of the excess or deficiency in both halves of the ship.

  • (10) Where the sheer in the after half of a ship exceeds the standard and the sheer in the forward half is less than the standard, no credit shall be given for the excess of sheer and the deficiency of sheer only shall be measured.

  • (11) Where the sheer in the forward half of a ship exceeds the standard,

    • (a) credit shall be given for the excess, if the sheer in the after half is not less than 75 per cent of the standard;

    • (b) no credit shall be given for the excess, if the sheer in the after half is less than 50 per cent of the standard; and

    • (c) intermediate credit shall be given for the excess, if the sheer in the after half is between 50 per cent and 75 per cent of the standard.

  Corrections for Variations from Standard Sheer

  • (12) The correction for sheer in a ship shall be the excess or deficiency of sheer referred to in subsections (9) to (11) multiplied by

    [0.75 - (S / 2 L)]

    where

    S

    is the total length of enclosed superstructures.

    	Column I		Column II	Column III
    	Station		Ordinate (millimetres)	Factor
    	After Perpendicular	25	(Ls ÷ 3 + 10)	1
    After half	1/6 L from A.P.	11.1	(Ls ÷ 3 + 10)	3
    	1/3 L from A.P.	2.8	(Ls ÷ 3 + 10)	3
    	Amidships		0	1
    	Amidships		0	1
    Forward half	1/3 L from F.P.	5.6	(Ls ÷ 3 + 10)	3
    	1/6 L from F.P.	22.2	(Ls ÷ 3 + 10)	3
    	Forward Perpendicular	50	(Ls ÷ 3 + 10)	1

  Addition for Deficiency of Sheer

  • (13) Where the sheer of a ship is less than the standard, the correction for deficiency of sheer, calculated in accordance with subsection (12), shall be added to the freeboard.

  Deduction for Excess of Sheer

  • (14) Where the sheer of a ship exceeds the standard, the deduction from freeboard shall be as follows:

    • (a) where an enclosed superstructure covers 0.1 L before and 0.1 L abaft amidships, the deduction shall be equal to the correction for excess of sheer, calculated in accordance with subsection (12);

    • (b) where no enclosed superstructure covers amidships, no deduction shall be made; and

    • (c) where an enclosed superstructure covers less than 0.1 L before and 0.1 L abaft amidships, the deduction shall be calculated by linear interpolation.

  • (15) No reduction of the basic freeboard, pursuant to subsection (14), that exceeds 125 mm per 100 m of length (L) shall be made.

Correction for Bow Height

• • 23 (1) Subject to subsections (2) and (3), where a ship’s bow height, being the vertical distance at the forward perpendicular between

    • (a) the water line corresponding to the basic freeboard, as corrected in accordance with sections 20 to 22 of this Part, and the designed trim, and

    • (b) the top of the exposed deck at side,

    is less than

    • (c) 49.417 L (1 - L/500) millimetres, in the case of a ship of less than 167.6 m in length, or

    • (d) 8677-18.917 L millimetres, in the case of a ship of 167.6 m or more in length,

    the basic freeboard shall be increased by the difference between the ship’s bow height and the bow height described in paragraphs (c) and (d).

  • (2) Where the ship’s bow height includes sheer and that sheer does not extend for at least 15 per cent of the length of the ship measured from the forward perpendicular, the ship’s bow height shall be deemed to be its actual bow height minus the amount of that sheer.

  • (3) Where the ship’s bow height includes the height of a superstructure and that superstructure

    • (a) does not extend from the stem to a point at least 0.06 L abaft the forward perpendicular,

    • (b) in the case of a ship not over 152.4 m in length, is not an enclosed superstructure, and

    • (c) in the case of a ship of over 152.4 m in length, is not fitted with closing appliances to the satisfaction of the Assigning Authority,

    the ship’s bow height shall be deemed to be its actual bow height minus the height of that superstructure.

Correction for Deck Line

• • 24 (1) Where the actual depth, measured from the same point as for moulded depth to the point where the upper edge of the deck line is to be placed, is greater than D, the difference between the two depths shall be added to the basic freeboard.

  • (2) Where the actual depth, measured from the same point as for moulded depth to the point where the upper edge of the deck line is to be placed, is less than D, the difference between the two depths shall be deducted from the basic freeboard.

PART IIILoad Line Marks

Deck Line

• • 25 (1) A horizontal line, hereinafter referred to as the “deck line”, that is 300 mm in length and 25 mm in breadth shall be marked amidships on the outer surface of the shell on each side of the ship.

  • (2) The upper edge of the deck line shall normally pass through the point where the continuation outwards of the upper surface of the freeboard deck intersects the outer surface of the shell, as illustrated in Figure 1.

  • (3) The deck line may be placed with reference to another fixed point on the ship if the freeboard is correspondingly corrected in accordance with section 24 of Part II of this Schedule.

Load Line Diamond

• • 26 (1) A right angled diamond, hereinafter referred to as “the diamond”, as illustrated in Figure 2, shall be marked amidships below the deck line on each side of the ship.

  • (2) The diamond shall be outlined with lines 25 mm in breadth and the diagonal measurement of the diamond shall be 380 mm.

  • (3) The diamond shall be intersected by a horizontal line measuring 540 mm in length and 25 mm in breadth, the midpoint of the upper edge of which coincides with the midpoint of the diamond.

  • (4) The diamond shall be placed so that its centre point is at a distance below the upper edge of the deck line equal to

    • (a) the assigned summer freeboard for fresh water calculated in accordance with Part II of this Schedule; or

    • (b) where applicable, the summer freeboard for fresh water assigned in accordance with subsection 11(2) of these Regulations.

Load Lines

• • 27 (1) Horizontal lines to be known as fresh water load lines, indicating the assigned fresh water freeboards, shall be marked as illustrated in Figure 2, each line measuring 230 mm in length and 25 mm in breadth and extending forward of and at right angles to a vertical line measuring 25 mm in breadth.

  • (2) The vertical line referred to in subsection (1) shall be marked 660 mm forward of the vertical diagonal of the load line diamond.

  • (3) A load line, to be known as the midsummer fresh water load line, shall be placed so that its upper edge marks the assigned midsummer fresh water freeboard and the letters “MS” shall be marked forward of this line.

  • (4) A load line, to be known as the summer fresh water load line, shall be placed so that its upper edge marks the assigned summer fresh water freeboard and the letter “S” shall be marked forward of this line.

  • (5) A load line, to be known as the intermediate fresh water load line, shall be placed so that its upper edge marks the assigned intermediate fresh water freeboard and the letter “I” shall be marked forward of this line.

  • (6) A load line, to be known as the winter fresh water load line, shall be placed so that its upper edge marks the assigned winter fresh water freeboard and the letter “W” shall be marked forward of this line.

  • (7) Where a ship has been assigned salt water freeboards, horizontal lines known as salt water load lines shall be also marked as illustrated in Figure 2, each line measuring 230 mm in length and 25 mm in breadth, extending abaft the vertical line, placed so that their upper edges mark the appropriate assigned salt water freeboards and marked with letters in the same fashion as for the fresh water load lines but placed abaft these salt water load lines.

  • (8) Where salt water load lines are marked, the letters “SW” shall be marked above these lines and the letters “FW” shall be marked above the fresh water load lines.

  • (9) Notwithstanding any other provision of this section, where the characteristics of the ship or the nature of the ship’s service or navigational limits make any of the load lines inapplicable, these lines may be omitted.

  • (10) Notwithstanding any other provision of this Part, where a ship has been assigned a freeboard in accordance with subsection 11(2) of these Regulations, the ship shall be marked as follows:

    • (a) a load line shall be placed so that its upper edge marks that freeboard;

    • (b) no load line marking any freeboard that is less than the freeboard referred to in paragraph (a) shall be marked; and

    • (c) the letter, designating the season during which the freeboard equal to or next smaller in size to the freeboard referred to in paragraph (a) would have applied, shall be marked beside the load line marked in accordance with this subsection.

Mark of Assigning Authority

• • 28 (1) The mark of the Authority by whom the freeboards are assigned shall be indicated alongside the load line diamond above the horizontal line that passes through the centre of the diamond.

  • (2) The mark referred to in subsection (1) shall consist of not more than two letters to identify the Authority’s name, each letter measuring 115 mm in height and 75 mm in breadth.

Details of Marking

• • 29 (1) All load line marks shall be painted in white or yellow on a dark ground or in black on a light ground.

  • (2) The marks referred to in subsection (1) shall be permanently marked on the sides of the ship to the satisfaction of the Assigning Authority.

  • (3) The marks referred to in subsection (1) shall be plainly visible and, if necessary, special arrangements shall be made for this purpose.