Schedule 3
(Regulation 12)
CONDITION OF ASSIGNMENT
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1.1 In this Schedule, except where the context otherwise requires —
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“breadth (B)” means the maximum breadth of the ship measured amidships to the moulded line of the frame in the case of a ship having a metal shell, or to the outer surface of the hull in the case of a ship having a shell of another material;
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“enclosed superstructure” means a superstructure —
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(a) which has enclosing bulkheads of efficient construction in which all access openings are fitted with sills and weathertight doors; and
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(b) in which all other openings in sides or ends are fitted with efficient weathertight means of closing;
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but does not include a bridge or poop fulfilling these requirements unless access to machinery and other working spaces within the bridge or poop is provided by alternative means which are available at times when access openings in the bulkheads of the bridge or poop are closed;
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“exposed position” means a position which is —
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(a) exposed to weather and sea; or
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(b) within a structure so exposed other than enclosed superstructure;
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“forward perpendicular” means the perpendicular taken at the forward end of the ship's length, coinciding with the foreside of the stem on the waterline on which such length is measured; and “after perpendicular” means the perpendicular taken at the after end of such length;
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“freeing port area (A)” means the sum of the areas of the openings of freeing ports on each side of the ship for each well;
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“height” in relation to a superstructure means the least vertical height measured at side from the top of the superstructure deck beams to the top of the freeboard deck beams; and the “standard height” of a superstructure means the height ascertained in accordance with the provisions of paragraph 9 of Schedule 2;
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“Position 1” or “Position 2” means those positions in which structure, openings or fittings are situated —
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(a) in the case of Position 1, on exposed freeboard and raised quarter decks, and on exposed superstructure decks situated forward of a point located a quarter of the ship's length from the forward perpendicular; and
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(b) in the case of Position 2, on exposed superstructure decks situated abaft a quarter of the ship's length from the forward perpendicular;
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“Summer load waterline” means the waterline which corresponds to the Summer load line of the ship;
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“superstructure” means a decked structure, including a raised quarter deck, situated on the freeboard deck which either extends from side to side of the ship or is such that its side plating is not inboard of the shell plating by more than four per cent of the breadth of the ship; and where the freeboard deck consists of a lower deck as described in subparagraph (b) of the definition of “freeboard deck”, includes that part of the hull which extends above the freeboard deck;
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“superstructure deck” means a deck forming the top of a superstructure;
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“Type “A” ship” means a ship which is designed to carry only liquid cargoes in bulk and —
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(a) the cargo tanks of the ship have only small access openings closed by watertight gasketed covers of steel or equivalent material;
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(b) the ship has high integrity of the exposed deck and has a low permeability of loaded cargo compartments;
(c) (i) in the case of a ship constructed before the 8th day of June, 2000, where over one hundred and fifty metres in length and designed to have empty compartments when loaded to the Summer load waterline, the ship shall be capable of remaining afloat after the flooding of one of these empty compartments, at an assumed permeability of zero point nine five in a condition of equilibrium; where over two hundred and twenty-five metres in length its machinery space shall be treated as a floodable compartment, but with an assumed permeability of zero point eight five;
(ii) in the case of a ship constructed on or after the 8th day of June 2000, where over one hundred and fifty metres in length and a freeboard of less than required for a type “B” ship has been assigned, when loaded in accordance with the initial condition of loading before flooding, the ship is capable of remaining afloat in a satisfactory condition of equilibrium after the flooding of a compartment or compartments with an assumed permeability of zero point nine five, consequent on the damage assumptions specified in paragraph 5(8) of Part 1 of Schedule 2; in such a ship the machinery space shall be treated as a floodable compartment, but with a permeability of zero point eight five;
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(d) the condition of equilibrium referred to in subparagraph (c)(i) is as follows —
(i) the final water line after the flooding is below the top of a ventilator coaming, the lower edge of an air pipe opening, the upper edge of the sill of an access opening fitted with a weathertight door, and the lower edge of another opening through which progressive flooding may take place;
(ii) the angle of heel due to unsymmetrical flooding does not exceed 150 or, if no part of the deck is immersed, an angle of heel of up to 170 may be accepted;
(iii) the metacentric height calculated using the constant displacement method has a positive value in the upright condition after the flooding;
(iv) the ship has adequate residual stability; and
(v) the ship has sufficient stability during intermediate stages of flooding to the satisfaction of the Minister or person or organization authorized by the Minister;
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(e) The condition of equilibrium referred to in subparagraph (c)(ii) is regarded as satisfactory if the following conditions are fulfilled —
(i) The final waterline after flooding, taking into account sinkage, heel and trim, is below the lower edge of an opening through which progressive downflooding may take place. Such openings shall include air pipes, ventilators and openings which are closed by means of weathertight doors or hatch covers, and may exclude those openings closed by means of manhole covers and flush scuttles, cargo hatch covers of the type described in subparagraph (a), remotely operated sliding watertight doors, and sidescuttles of non-opening type. However, in the case of doors separating a main machinery space from a steering gear compartment, watertight doors may be of a hinged, quick-acting type kept closed at sea, while not in use, provided also that the lower sill of such doors is above the summer load waterline,
(ii) If pipes, ducts or tunnels are situated within the assumed extent of damage penetration as defined under paragraph 5.8.2 of Schedule 2, arrangements shall be made so that progressive flooding cannot thereby extend to compartments other than those assumed to be floodable in the calculation for each case of damage,
(iii) If no part of the deck is immersed, the angle of heel due to asymmetrical flooding does not exceed 17º. If a part of the deck is immersed, the angle of heel due to asymmetrical flooding does not exceed 15o,
(iv) The metacentric height in the flooded condition is positive,
(v) When a part of the deck outside the compartment assumed flooded in a particular case of damage is immersed, or in a case where the margin of stability in the flooded condition may be considered doubtful, the residual stability is to be investigated by the Minister or person or organization authorized by the Minister. It may be regarded as sufficient if the righting lever curve has a minimum range of 200 beyond the position of equilibrium with a maximum righting lever of at least zero point one metres within this range. The area under the righting lever curve within this range shall not be less than zero point zero one seven five metres rad. The Minister or person or organization authorized by the Minister shall give consideration to the potential hazard presented by protected or unprotected openings which may become temporarily immersed within the range of residual stability,
(vi) The Minister or a person or an organization authorized by the Minister is satisfied that the stability is sufficient during the intermediate stages of flooding;
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“Type “B” ship” means a ship other than a Type “A” ship;
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“unattended machinery space” means a machinery space which during the normal operation of the ship at sea is unattended for any period, and “attended machinery space” means a machinery space other than an unattended machinery space;
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“weathertight” in relation to a part of a ship other than a door in a bulkhead means that water will not penetrate it and so enter the hull of the ship in the worst sea and weather conditions likely to be encountered by the ship in service; and in relation to a door in a bulkhead it means a door which—
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(a) is constructed of steel or other equivalent material, is strongly and permanently attached to the bulkhead, and is framed, stiffened and fitted so that the whole structure in which it is set is of equivalent strength to the unpierced bulkhead;
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(b) is closed by means of gaskets, clamping devices or other equivalent means permanently attached to the bulkhead or to the door itself;
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(c) when closed, is weathertight as above defined; and
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(d) it can be operated from either side of the bulkhead.
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1.2 In the definition of a “Type “A” ship”, the initial condition of loading before flooding referred to in paragraph (c)(ii) shall be determined as follows —
1.2.1 the ship is loaded to its summer load waterline on an imaginary even keel;
1.2.2 when calculating the vertical centre of gravity, the following principles apply —
1.2.2.1 homogenous cargo is carried;
1.2.2.2 all cargo compartments, except those referred to under subparagraph 1.2.2.3, but including compartments intended to be partially filled, shall be considered fully loaded except that in the case of fluid cargoes each compartment shall be treated as 98% full;
1.2.2.3 if the ship is intended to operate at its Summer Load waterline with empty compartments, the compartments shall be considered empty provided the height of the centre of gravity so calculated is not less than as calculated under subparagraph 1.2.2.2;
1.2.2.4 50% of the individual total capacity of all tanks and spaces fitted to contain consumable liquids and stores is allowed for. It shall be assumed that for each type of liquid, at least one transverse pair or a single centreline tank has maximum free surface, and the tank or combination of tanks to be taken into account shall be those where the effect of free surfaces is the greatest; in each tank the centre of gravity of the contents shall be taken at the centre of volume of the tank. The remaining tanks shall be assumed either completely empty or completely filled, and the distribution of consumable liquids between these tanks shall be effected so as to obtain the greatest possible height above the keel for the centre of gravity;
1.2.2.5 at an angle of heel of not more than 5º in each compartment containing liquids, as prescribed in subparagraph 1.2.2.2 except that in the case of compartments containing consumable fluids, as prescribed in subparagraph 1.2.2.4 the maximum free surface effect shall be taken into account. Alternatively, the actual free surface effects may be used, provided the methods of calculation are acceptable to the Minister or any person or organization authorized by him or her;
1.2.2.6 weights shall be calculated on the basis of the following values for specific gravities —
| salt water | 1.025 |
| fresh water | 1.000 |
| oil fuel | 0.950 |
| diesel oil | 0.900 |
| lubricating oil | 0.900 |
PART I
SHIPS IN GENERAL
Structural strength and stability
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2.1 The construction of the ship must be such that its general structural strength is sufficient for the freeboards assigned.
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2.2 The design and construction of the ship must be such as to ensure that its stability in all probable loading conditions is sufficient for the freeboards assigned, and for this purpose due consideration is given to the intended service of the ship and to the following criteria.
2.2.1 The area under the curve of righting levers (GZ curve) is not be less than —
2.2.1.1 zero point zero five five metre-radians up to an angle of 30°;
2.2.1.2 zero point zero nine metre-radians up to an angle of 40° or the angle at which the lower edge of an opening in the hull, superstructures or deckhouses which cannot be closed weathertight, are immersed where that angle is less; and
2.2.1.3 zero point zero three metre-radians between the angles of heel of 30° and 40° or such lesser angle as is referred to under subparagraph 2.2.1.2.
2.2.2 The righting lever (GZ) is at least zero point two zero metres at an angle of heel equal to or greater than thirty.
2.2.3 The maximum righting lever shall occur at an angle of heel not less than 30°.
2.2.4 The initial transverse metacentric height shall not be less than 0.15 metres. In the case of a ship carrying a timber deck cargo which complies with subparagraph 2.2.1 by taking into account the volume of timber deck cargo, the initial transverse metacentric height shall not be less than zero point zero five metres.
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2.3 To determine whether the ship complies with the requirements of subparagraph 2.2 the ship shall, unless otherwise permitted, be subject to an inclining test which shall be carried out in the presence of a surveyor appointed by the Minister or, for the ships listed under regulation 17 (5), a Survey or of ships appointed by the Minister or a person or an organization authorized by the Minister.
Superstructure end bulkheads
3. Bulkheads at exposed ends of enclosed superstructures shall be of efficient construction.
The height of a sill in an access opening in such a bulkhead shall, except where otherwise stated, be at least three hundred and eighty millimetres above the deck.
Hatchways: general
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4.1 The provisions of this paragraph and of paragraphs 5 and 6 apply to all hatchways in Position 1 or in Position 2 except if otherwise stated.
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4.2 Subject to subparagraph 4.3, the construction and the means for securing the weathertightness of a hatchway must —
4.2.1 in the case of a hatchway closed by a portable cover and secured weathertight by tarpaulins and battening devices, comply with the requirements of paragraph 5, and
4.2.2 in the case of a hatchway closed by a weathertight cover of steel or other equivalent material fitted with gaskets and clamping devices, comply with the requirements of paragraph 6.
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4.3 Every hatchway located in an exposed position on a deck above a superstructure deck and leading to a space below must be of such a construction and be fitted with such means as will secure the weathertightness of the hatchway, having regard to its position.
Hatchways closed by portable covers and secured weathertight by tarpaulins and battening devices
Coamings
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5.1 A hatchway must have a coaming of substantial construction. The coaming must be constructed of mild steel but may be constructed of other material provided that the strength and stiffness of the coaming are equivalent to those of a coaming of mild steel. The height of the coaming above the deck must be at least —
5.1.1 six hundred millimetres, if the hatchway is in Position 1;
5.1.2 four hundred and fifty millimetres, if the hatchway is in Position 2.
Covers
5.2.1 The width of a bearing surface for a hatchway cover must be at least sixty-five millimetres.
5.2.2 In the case of a cover made of wood —
5.2.2.1 the finished thickness of the cover shall be at least sixty millimetres in association with a span of not more than one point five metres, and the thickness of covers for larger spans shall be increased by four millimetres for each one hundred millimetres above the span of one point five metres;
5.2.2.2 the ends of the cover shall be protected by galvanised steel bands efficiently secured.
5.2.3 In the case of a cover made of mild steel —
5.2.3.1 the strength of the cover shall withstand the assumed load given in Table 1, and the product of the maximum stress thus calculated and the factor 4.25 does not exceed the minimum ultimate strength of the material —
TABLE 1
| Ship's Length (L) | Assumed Load, per square metre |
| Hatchway in Position 1 | Hatchway in Position 2 |
| 24 metres | 1 metric tonne | 0.75 metric tonne |
| 100 metres or over | 1.75 metric tonnes | 1.30 metric tonnes |
| Over 24 metres but less than 100 metres | to be ascertained by linear interpolation |
5.2.3.2 the cover must be so designed as to limit the deflection to not more than 0.0028 times the span under the assumed load in Table 1 appropriate to the hatchway cover.
5.2.4 In the case of a cover made neither of mild steel nor wood the strength and stiffness of the cover is equivalent to those of a cover of mild steel.
Portable beams
5.3.1 If portable beams for supporting hatchway covers are made of mild steel, their strength must be such as to withstand the assumed load given in Table 1, and the product of the maximum stress thus calculated and the factor 5 does not exceed the minimum ultimate strength of the material.
5.3.2 Portable beams must be so designed as to limit the deflection to not more than 0.0022 times the span under the assumed load in Table 1 appropriate to the beam.
5.3.3 In the case of portable beams not made of mild steel, the strength and stiffness of the beams are be equivalent to those of beams of mild steel.
Pontoon covers
5.4.1 If pontoon covers of mild steel are used in place of portable beams and covers, their strength must be such as to withstand the assumed load given in Table 1, and the product of the maximum stress thus calculated and the factor 5 does not exceed the minimum ultimate strength of the material.
5.4.2 Pontoon covers must be so designed as to limit the deflection to not more than 0.0022 times the span under the assumed load in Table 1 appropriate to the pontoon cover.
5.4.3 Mild steel plating forming the tops of pontoon covers must not be less in thickness than one per cent of the spacing of the stiffeners or six millimetres, whichever is the greater.
5.4.4 In the case of pontoon covers not made of mild steel, the strength and stiffness of the cover shall be equivalent to those of a cover of mild steel.
Carriers or sockets
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5.5 Carriers or sockets for portable beams shall be of substantial construction and provide efficient means for the fitting and securing of the beams. If rolling types of beams are used the arrangements shall ensure that the beams remain properly in position when the hatchway is closed.
Cleats
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5.6 Cleats must be set to fit the taper of the wedges. Cleats must be at least sixty-five millimetres wide and spaced not more than six hundred millimetres, centre to centre. The cleats along each side or end of the hatchway shall not be more than one hundred and fifty millimetres from the hatch corners.
Battens and wedges
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5.7 Battens and wedges shall be efficient for their purpose and in good condition. Wedges shall be of tough wood or equivalent material cut to a taper of not more than 1 in 6 and must not be less than thirteen millimetres thick at the toes.
Tarpaulins
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5.8 At least two layers of tarpaulin must be provided for a hatchway. The tarpaulin must be waterproof, in good condition, and have satisfactory strength and quality.
Security of hatchway covers
5.9.1 Except as otherwise provided in subparagraph 5.9.2, steel bars must be provided for every hatchway to ensure that each section of hatchway covers can be efficiently and independently secured after the tarpaulins have been battened down and that hatchway covers of more than one point five metres in length are secured by at least two such bars.
5.9.2 Bars of material other than steel, or means of securing hatchway covers otherwise than by bars, may be used if —
5.9.2.1 in the case of the former, the strength and stiffness of the bars used are equivalent to those of steel bars;
5.9.2.2 in either case the degree of security so achieved is not less than that which would be achieved by the use of steel bars.
Hatchways closed by weathertight covers of steel or equivalent material fitted with gaskets and clamping devices
Coamings
6.1.1 Except as otherwise provided in subparagraph 6.1.2, a hatchway must have a coaming of substantial construction the height of which above the deck shall be at least —
6.1.1.1 six hundred millimetres, where the hatchway is in Position 1;
6.1.1.2 four hundred and fifty millimetres, where the hatchway is in Position 2.
6.1.2 A hatchway may have a coaming of less than the height applicable under the provisions of subparagraph 6.1.1, or in exceptional circumstances a coaming may be dispensed with altogether, if that —
6.1.2.1 the safety of the ship is not impaired in the worst sea or weather conditions likely to be encountered by the ship in service;
6.1.2.2 when any coaming is fitted it is of substantial construction.
Weathertight covers
6.2.1 The strength of a cover of mild steel must be such as to withstand the assumed load given in Table 1, and the product of the maximum stress thus calculated and the factor 4.25 does not exceed the minimum ultimate strength of the material. A cover of mild steel must be so designed as to limit the deflection under such a load to not more than 0.0028 times the span.
6.2.2 A cover of mild steel made of materials other than mild steel must have a strength and stiffness equivalent to that required for a cover of mild steel.
6.2.3 A cover of mild steel must be fitted with efficient means by which it can be secured and made weathertight.
6.2.4 Mild steel plating forming the top of a cover must be not less in thickness than 1% of the spacing of the stiffeners or six millimetres whichever is the greater.
Machinery space openings
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7.1 A machinery space opening situated in Position I or Position 2 must be efficiently framed and enclosed by a steel casing of substantial strength, account being taken of the extent, if any, to which the casing is protected by other structures.
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7.2 A doorway in a casing under subparagraph 7.1 shall be fitted with a steel watertight door having a sill the height of which is be at least —
7.2.1 Six hundred millimetres above the deck, where the opening is in Position 1;
7.2.2 Three hundred and eighty millimetres above the deck, where the opening is in Position 2.
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7.3 An opening in a casing other than a doorway must be provided with a permanently attached cover of steel fitted with efficient means by which it can be secured and maintained weathertight and, except in the case of a cover consisting of a plate secured by bolts, is capable of being operated from either side of the opening.
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7.4 A fiddley, funnel or machinery space ventilator situated in an exposed position on the freeboard deck or on a superstructure deck must have a coaming of such a height above the deck as will provide adequate protection having regard to its position.
Miscellaneous openings in freeboard and superstructure decks
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8.1 A manhole and flush scuttle in Position I or Position 2 shall be provided with a substantial cover fitted with efficient means to secure and maintain it watertight. Unless secured by closely spaced bolts, every such cover is permanently attached by a chain or equivalent means so as to be available for immediate use at all times.
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8.2 An opening in a deck other than a hatchway, machinery space opening, manhole or flush scuttle must —
8.2.1 if situated in the freeboard deck, be protected either by an enclosed superstructure or by a deckhouse or companionway equivalent in strength and weathertightness to an enclosed superstructure;
8.2.2 if situated in an exposed position —
8.2.2.1 in a deck over an enclosed superstructure and giving access to space within that superstructure; or
8.2.2.2 on top of a deckhouse on the freeboard deck and giving access to space below that deck,
be protected by an efficient deckhouse or companionway fitted with weathertight doors;
8.2.3 if situated in an exposed position in a deck above the deck over an enclosed superstructure and giving access to space within that superstructure, be protected either in accordance with the requirements of subparagraph 8.2.2 or to such lesser extent as may be adequate having regard to its position.
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8.3 A door in a companionway, deckhouse or enclosed superstructure referred to in subparagraph 8.2.1 or 8.2.2 must have a sill the height of which is at least —
8.3.1 six hundred millimetres, where the structure is in Position 1;
8.3.2 three hundred and eighty millimetres, where the structure is in Position 2.
Ventilators
9.1.1 Except as otherwise provided in subparagraph 9.1.2, a ventilator in Position 1 or Position 2 leading to spaces below the freeboard deck or below the deck of an enclosed superstructure must have a coaming of steel or equivalent material, substantially constructed and efficiently connected to the deck. The height of the coaming is at least —
9.1.1.1 nine hundred millimetres above the deck, if the ventilator is in Position 1;
9.1.1.2 seven hundred and sixty millimetres above the deck, if the ventilator is in Position 2.
9.1.2 If the coaming for a ventilator under subparagraph 9.1.1 above is situated in a position in which it will be especially exposed to weather and sea the height of the coaming is increased by such an amount as is necessary to provide adequate protection having regard to its position.
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9.2 If the coaming of a ventilator referred to in the subparagraph 9.1 exceeds nine hundred millimetres in height above the deck it must be efficiently supported by stays, brackets or other means.
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9.3 A ventilator in Position 1 or Position 2 which passes through a superstructure, other than an enclosed superstructure, must have a coaming of steel or equivalent material at the freeboard deck substantially constructed and efficiently connected to that deck and at least nine hundred millimetres in height above that deck.
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9.4 Subject to subparagraph 9.5, a ventilator opening in Position 1 or Position 2 must be provided with an efficient appliance by which it can be closed and secured weathertight. A closing appliance provided on board a ship of not more than one hundred metres in length must be permanently attached and, in the case of another ship, must be so attached or be conveniently stowed near to the ventilator for which it is provided.
9.5.1 A ventilator in Position 1 the coaming of which exceeds 4.5 metres in height above the deck and a ventilator in Position 2 the coaming of which exceeds two point three metres in height above the deck, may not be fitted with a closing appliance unless the fitting of such an appliance is considered necessary by the Minister or person or organization authorized by the Minister in order to provide adequate protection.
9.5.2 A ventilator leading to a battery room must not be fitted with a closing appliance.
Air pipes
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10.1 The exposed parts of an air pipe leading to a ballast or other tank and extending above the freeboard deck or a superstructure deck must be of substantial construction.
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10.2 The exposed opening of air pipe must be fitted with efficient means of closing the opening weathertight, which must be permanently attached so as to be ready for immediate use.
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10.3 Subject to subparagraph 10.4, the height above the deck of the exposed opening of an air pipe must be —
10.3.1 at least seven hundred and sixty millimetres, if that deck is the freeboard deck;
10.3.2 at least four hundred and fifty millimetres, if that deck is a superstructure deck or, if the superstructure is of less than standard height, such height as is necessary to adequately compensate for the lower height of the superstructure.
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10.4 The heights given in subparagraph 10.3 may be reduced if —
10.4.1 the working of the ship would be unreasonably impaired if those heights were adhered to; and
10.4.2 the closing arrangements will ensure that the lower height is adequately compensated for.
Cargo ports and similar openings
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11.1 Cargo ports and similar openings in the ship's side below the freeboard deck or in the sides or ends of superstructures which form part of the shell of the ship must be compatible with the design of the ship and does not exceed in number those necessary for the proper working of the ship.
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11.2 A cargo port and opening must be provided with a door or doors so fitted and designed as to ensure watertightness and structural integrity commensurate with the surrounding shell plating.
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11.3 Unless the Minister or person or organization authorized by the Minister permits, the lower edge of cargo port or opening must not be so situated that it is below a line drawn parallel to the freeboard deck at side having as its lowest point at least 2.30 millimetres above the upper edge of the uppermost load line.
Scuppers, inlets and discharges
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12.1 Subject to subparagraphs 12.4 and 12.9, a discharge led through the shell of a ship —
12.1.1 from spaces below the freeboard deck; or
12.1.2 from within an enclosed superstructure;
12.1.3 from within a deckhouse on the freeboard deck which is fitted with weathertight doors,
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must be fitted in accordance with subparagraphs 12.2 and 12.3 with the means for preventing water from passing inboard.
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12.2 Subject to subparagraph 12.3, this consists of a single automatic non-return valve fitted at the shell of the ship and having positive means of closure from a position above the freeboard deck.
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A position must be readily accessible at all times under service conditions and must be provided with an indicator showing whether the valve is open or closed.
12.3.1 If the vertical distance from the Summer load waterline to the inboard end of a discharge pipe exceeds 0.01(L) two automatic non-return valves having no positive means of closure may be fitted. One valve shall be situated as close to the ship's shell as practicable and be substantially connected to it and the inboard valve must be so situated that at all times under service conditions it will be readily accessible for examination.
12.3.2 If the vertical distance referred to in subparagraph 12.3.1 exceeds zero point zero two (L) the Minister or person or organization authorized by the Minister may permit a single automatic non-return valve having no positive means of closure, to be fitted. The valve must be situated as close to the ship's shell as practicable and substantially connected to it.
12.4.1 The controls of a valve in an attended machinery space and serving a main or auxiliary sea inlet or discharge or bilge injection system must be so sited as to be readily accessible for examination at all times under service conditions.
12.4.2 The controls of a valve in an unattended machinery space and serving a sea inlet or discharge or bilge injection system must be so sited as to be readily accessible at all times under service conditions, with particular regard to possible delay in reaching or operating the controls. In addition, the machinery space in which the valve is situated must be equipped with an efficient warning device to give warning at suitable control positions of an entry of water into the machinery space other than water resulting from the normal operation of machinery.
12.4.3 Valves referred to in subparagraph 12.4.1 and 12.4.2 must be equipped with an indicator showing whether the valve is open or closed.
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12.5 Subject to subparagraph 12.6 a scupper and discharge pipe originating at any level and penetrating the shell of the ship—
12.5.1 more than four hundred and fifty millimetres below the freeboard deck; or
12.5.2 less than six hundred millimetres above the Summer load waterline;
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must be equipped with an automatic non-return valve situated as close to the ship's shell as practicable and substantially connected to it.
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12.6 Subparagraph 12.5 does not apply —
12.6.1 if the scupper or discharge pipe is fitted with the means for preventing water from passing inboard under with the provisions of subparagraphs 12.1 to 12.3; or
12.6.2 if the piping of the scupper or discharge pipe is of substantial thickness;
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12.7 A scupper leading from a superstructure other than an enclosed superstructure or from a deckhouse not fitted with weathertight doors, must be led overboard.
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12.8 All shell fittings and the valves required by this paragraph must be of steel, bronze or other suitable ductile material, and all pipes under this paragraph must be of steel or equivalent material.
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12.9 In ships constructed on or after the 8th day of June, 2000 scuppers led through the shell from enclosed superstructures used for the carriage of cargo must be permitted only where the edge of the freeboard deck is not immersed when the ship heels 5° either way. In other cases the drainage must be led inboard to a suitable space, or spaces, of adequate capacity having a high water level alarm and provided with suitable arrangements for discharge overboard.
Side scuttles
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13.1 Every side scuttle to a space below the freeboard deck or to a space within an enclosed superstructure must be fitted with a hinged inside deadlight so that it can be effectively closed and secured watertight.
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13.2 No side scuttle must be fitted in a position such that its sill will be below a line drawn parallel to the freeboard deck at side and having its lowest point —
13.2.1 tow point five per cent of the breadth of the ship above the Summer load waterline, or Summer Timber load waterline, if assigned; or
13.2.2 five hundred millimetres above the Summer load waterline, or Summer Timber load waterline, if assigned,
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whichever is the greater distance.
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13.3 A side scuttle, glass and deadlight, where fitted, must be of substantial construction and be efficiently fitted.
Freeing ports and arrangements
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14.1 If bulwarks on the weather portions of the freeboard deck, a raised quarter deck or a superstructure deck form wells, efficient provision shall be made for rapidly freeing the decks of water in bulk and for draining them, and in particular the requirements set out in subparagraphs 14.2 to 14.9 shall be complied with.
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14.2 Except as otherwise provided under subparagraphs 14.4 and 14.5, the freeing port area (A) for each well shall —
14.2.1 if the well is on the freeboard deck or on a raised quarter deck, be not less than the area ascertained in accordance with subparagraph 14.3; and
14.2.2 if the well is on a superstructure deck, other than a raised quarter-deck, be not less than one half of the area given by subparagraph 14.3.
14.3.1 Subject to subparagraph 14.3.3 below, if the length (l) of a bulwark in the well is twenty metres or less —
(A) = 0.7+ 0.035 (1) (square metres); and
14.3.2 Subject to subparagraph 14.3.3 below, where (l) exceeds twenty metres,
(A) = 0.07 (1) (square metres).
The length (l) need in no case be greater than 0.7(L).
14.3.3 If the bulwark is more than one point two metres in average height the required area shall be increased by zero point zero zero four square metres per metre of length of well for each zero point one metre difference in height. If the bulwark is less than zero point nine metre in average height, the required area may be decreased by zero point zero zero four square metre per metre of length of well for each zero point one metre difference in height.
14.4.1 If the deck on which the well is situated has no sheer, the freeing port area shall be the area ascertained under subparagraph 14.3 increased by fifty per cent.
14.4.2 If the deck on which the well is situated has sheer less than standard sheer, the freeing port area is the area ascertained under subparagraph 14.3 increased by a percentage to be obtained by linear interpolation.
14.4.3 If the deck on which the well is situated has sheer, two thirds of the freeing port area must be situated in the half of the well which is nearest to the lowest point of the sheer.
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14.5 The lower edge of a freeing port must be as near to the deck as practicable.
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14.6 A freeing port more than two hundred and thirty millimetres in depth must be protected by rails or bars so fixed that the distance between the lowest rail or bar and the lower edge of the freeing port does not exceed two hundred and thirty millimetres.
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14.7 A freeing port fitted with a shutter must have sufficient clearance to prevent jamming of the shutter, and the shutter hinges shall have pins or bearings of efficient non-corrodible material.
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14.8 Efficient provision must be made for freeing water from a superstructure other than an enclosed superstructure.
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14.9 If a ship fitted with a trunk does not comply with the requirements of paragraph 10.2.2.6 of Schedule 2, “Freeboards”, or if continuous or substantially continuous hatchway side coamings are fitted between detached superstructures the minimum area of the freeing port openings must be calculated using the following table:
| Breadth of hatchway or tunch in relation to the breadth of ship | Area of freeing ports in relation to the total area of the bulwarks |
| 40% or less | 20% |
| 75% or more | 10% |
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The area of freeing ports at intermediate breadths is obtained by linear interpolation.
Protection of the crew
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15.1 A deckhouse used for the accommodation of members of the crew must be of efficient construction.
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15.2 Except as otherwise provided in subparagraph 15.3, exposed parts of the freeboard deck and superstructure deck must be fitted at their perimeter with efficient guard rails or guard wires and stanchions complying with the requirements of subparagraph 15.4, or with bulwarks. In either case this protection must be at least one metre in height from the deck.
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15.3 The height specified in subparagraph 15.2 may be reduced at a particular point if —
15.3.1 the normal working of the ship would be unreasonably impeded; and
15.3.2 adequate protection is provided at that point.
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15.4 Guard rails or guard wires fitted under with subparagraph 15.2 consist of courses of rails or wires supported by stanchions efficiently secured to the deck. The opening between the lowest course of the rails or wires and the deck must not exceed two hundred and thirty millimetres in height and no opening above that course of rails or wires shall exceed three hundred and eighty millimetres in height. If the ship has rounded gunwales, the stanchions must be secured at the perimeter of the flat of the deck.
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15.5 Gangways, underdeck passages and another means of access used by the crew to pass between their quarters, the machinery space and another space in the ship in the course of their necessary work shall be so designed and constructed, and be fitted, if necessary, with life lines, access ladders, guard rails, guard wires, hand rails or other safety fittings, as to afford effective protection for the crew.
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15.6 Deck cargo carried on a ship must be so stowed that an opening which is in way of the cargo and which gives access to and from the crew's quarters, the machinery space and all other parts used in the necessary work of the ship, can be properly closed and secured against the admission of water. Effective protection for the crew in the form of guard rails or life lines must be provided above the deck cargo if there is no convenient passage on or below the deck of the ship.
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15.7 The requirements of this paragraph do not apply in the case of unmanned barges.
PART II
SPECIAL REQUIREMENTS APPLICABLE TO TYPE “A” SHIPS
Application
16. The requirements of paragraphs 17 to 20 apply to Type “A” ships.
Machinery casings
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17.1 Subject to subparagraph 17.2. a casing enclosing a machinery space opening in Position 1 or Position 2 must be protected by —
17.1.1 an enclosed poop or bridge of at least standard height; or
17.1.2 a deckhouse of equal height and equivalent strength and weathertightness.
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17.2 Subparagraph 17.1 does not apply and the casing need not be protected if —
17.2.1 there is no opening in the casing which gives direct access from the freeboard deck to the machinery space; or
17.2.2 the only opening in the casing has a steel weathertight door and leads to a space or passage way which is as strongly constructed as the casing and is separated from the stairway to the machinery space by a second steel weathertight door.
Gangway and access
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18.1 References in this paragraph to a poop or detached bridge apply also to a deckhouse fitted in lieu of and serving the purpose of a poop or detached bridge.
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18.2 Access between the poop and the detached bridge must be by means of —
18.2.1 a permanent and efficiently constructed gangway of substantial strength. The gangway must be at the level of the superstructure deck and have a platform at least one metre in width and of non-slip material. Efficient means of access from gangway level to the deck must be provided at each terminal point. The platform shall be fitted on each side throughout its length with guard rails or guard wires supported by stanchions. Such rails or wires must consist of not less than three courses, the lowest being not more than two hundred and thirty millimetres, and the uppermost being at least one metre above the platform, and no intermediate opening being more than three hundred and eighty millimetres in height. Stanchions must be at intervals of not more than one point five metres; or
18.2.2 an underdeck passage connecting and providing unobstructed access between those structures and complying with the following requirements—
18.2.2.1 the passage and all its fittings must be oil and gas tight;
18.2.2.2 the passage must be well lit, and be fitted with efficient gas detection and ventilation systems;
18.2.2.3 it must be situated immediately below the freeboard deck;
18.2.2.4 its distance from the shell plating must at no point throughout its length be less than one fifth of the breadth of the ship. Alternatively two underdeck passages may be provided one to port and one to starboard each of which must comply with the requirements of subparagraphs 18.2.2.1, 18.2.2.2 and 18.2.2.3;
18.2.2.5 means of exit from the passage to the freeboard deck must be —
18.2.2.5.1 so arranged as to be as near as practicable to the working areas to be used by the crew;
18.2.2.5.2 in no case more than ninety metres apart; and
18.2.2.5.3 fitted with efficient means of closing which are capable of quick release and operable from either side;
18.2.2.6 openings in the freeboard deck corresponding to the means of exit referred to in subparagraph 18.2.2.5, must be protected in accordance with the requirements of paragraph 8.2.1.; or
18.2.3 equivalent means of access.
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18.3 In adverse weather conditions, if the crew in the course of its duties may be required to go to working areas forward of the detached bridge, or forward of the poop in cases where there is no detached bridge, access must be by means of —
18.3.1 a gangway complying with the requirements of subparagraph 18.2.1;
18.3.2 an underdeck passage complying with the requirements of subparagraph 18.2.2; or
18.3.3 a walkway complying with the following requirements —
18.3.3.1 be not less than one metre in width and be situated on or as near as practicable to the centre line of the ship;
18.3.3.2 where obstructed by pipes or other fittings of a permanent nature, be provided with efficient means of passage over such obstruction;
18.3.3.3 be fitted on each side and throughout its length with guard rails or guard wires complying with the requirements in subparagraph 18.2.1;
18.3.3.4 have openings in these guard rails or guard wires which give access to and from the freeboard deck to the working areas used by the crew. Openings must be on alternate sides of the walkway and be situated not more than ninety metres apart on either side;
18.3.3.5 where the length of exposed deck to be traversed by the crew exceeds seventy metres, shelters of substantial construction must be set in way of the walkway at intervals not exceeding forty-five metres, every such shelter being capable of accommodating at least one person and be so constructed as to afford weather protection on the forward, port and starboard sides.
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18.4 The requirements of this paragraph do not apply in the case of unmanned barges.
Hatchway covers
19. The covers of hatchways in exposed positions on the freeboard deck, on a forecastle deck or on the top of an expansion trunk must be of steel, of efficient construction, and watertight when secured.
Freeing arrangements
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20.1 Exposed parts of the freeboard deck and superstructure decks must be fitted at their perimeter for at least half their length with guard rails or guard wires in lieu of bulwarks or with other equally effective freeing arrangements. Such guard rails or guard wires must comply with the requirements set out in relation to such rails or wires in paragraph 18.2.1.
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20.2 The upper edge of the sheer strake must be as low as practicable.
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20.3 If superstructures of the ship are connected by a trunk, the exposed parts of the freeboard deck in way of the trunk must be fitted at their perimeter throughout their length with guard rails or guard wires complying with the requirements set out in paragraph 18.2.1.
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20.4 If the ship is so constructed that notwithstanding the provision of freeing ports and arrangements it will be particularly subjected under service conditions to the building up of quantities of water on the freeboard deck efficient breakwaters must be fitted in suitable positions on that deck.
PART III
SPECIAL REQUIREMENTS APPLICABLE TO CERTAIN TYPE “B” SHIPS
Application
21. The requirements of paragraphs 22 to 25 apply to Type “B” ships assigned a reduced freeboard under the paragraph 5.3 of Schedule 2.
Gangway and access
22. A ship must comply with the requirements of —
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22.1 paragraph 18 as if it were a Type “A” ship; or
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22.2 paragraphs 23 and 24.
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23.1 References in this paragraph to a poop or detached bridge apply also to a deckhouse fitted in lieu of and serving the purpose of a poop or detached bridge.
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23.2 Access between the poop and the detached bridge must be by means of an efficiently constructed gangway of substantial strength fitted on or near the centre line of the ship. The gangway must be at least one metre in width and shall be fitted on each side and throughout its length with guard rails or guard wires complying with the requirements as set out in paragraph 18.2.1. If the length of the gangway exceeds seventy metres, shelters complying with the requirements under paragraph 18.3.3.5 must be provided in way of the gangway.
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24.1 In adverse weather conditions, if the crew in the course of its duties may be required to go to working areas forward of the detached bridge, or forward of the poop in cases where there is no detached bridge, access must be by —
24.1.1 the means described under paragraph 18.3;
24.1.2 the means described under paragraph 23.2; or
24.1.3 equivalent means of access.
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24.2 If hatchway coamings are six hundred millimetres or more in height, two walkways complying with the following requirements may be provided in lieu of subparagraph 24.1 —
24.2.1 the walkways must be efficiently constructed and of satisfactory strength;
24.2.2 the walkways shall each be at least one metre in width and be fitted on the freeboard deck alongside the outboard structure of the hatchway coamings, one to port and the other to starboard of the hatchways; and
24.2.3 on the side outboard of the hatchways each walkway must be fitted with guard rails or guard wire complying with the requirements set out in paragraph 18.2.1.
Freeing arrangements
25. A ship must comply with the requirements of paragraph 20.4.
PART IV
SPECIAL REQUIREMENTS APPLICABLE TO SHIPS ASSIGNED TIMBER FREEBOARDS
Application and interpretation
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26.1 The requirements of paragraphs 27 to 29 apply to ships assigned Timber freeboards.
26.1.2 The requirements of paragraph 30 apply in respect of timber deck cargo carried by a ship which is marked with timber load lines and is loaded to a depth greater than that indicated by the load line which, if timber load lines were not marked, would be appropriate in the circumstances.
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26.2 In this Part, except if the context otherwise requires —
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“deck cargo” means cargo carried in an uncovered space on the deck of a ship;
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“timber deck cargo” means deck cargo consisting of timber;
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“weather deck” means the uppermost complete deck exposed to weather and sea, a deck which is stepped being taken to consist for this purpose of the lowest line of the deck and the continuation of that line parallel to the upper part of the deck.
Superstructures
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27.1 A ship must have a forecastle of not less than the standard height of an enclosed superstructure and not less in length than 0.07(L).
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27.2 If the ship is less than one hundred metres in length it must be fitted after with —
27.2.1 a poop of not less than standard height; or
27.2.2 a raised quarter deck having either a deck house or a strong steel hood, so that the total height is not less than the standard height of an enclosed superstructure.
Double bottom tanks
28. Double bottom tanks fitted within the midship half length of the ship must have satisfactory watertight longitudinal subdivision.
Bulwarks, guard rails and stanchions
29. A ship must be fitted with —
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29.1 permanent bulwarks at least one metre in height which are especially stiffened on the upper edge and supported by strong bulwark stays attached to the deck, and provided with freeing ports complying with the requirements of paragraph 14.1 to 14.7; or
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29.2 efficient guard rails and stanchions at least one metre in height, of specially strong construction, and complying with the requirements of paragraph 15(4).
Stowage
Siting, distribution and stowage of timber deck cargo
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30.1 Cargo must be distributed and stowed so —
30.1.1 as to avoid excessive loading having regard to the strength of the deck and the supporting structure of the ship;
30.1.2 as to ensure that the ship will retain adequate stability at all stages of the voyage having regard in particular to —
30.1.2.1 the vertical distribution of the deck cargo;
30.1.2.2 the wind moments which can be expected on the voyage;
30.1.2.3 the losses of weight in the ship, including those due to the consumption of fuel and stores; and
30.1.2.4 possible increases of weight of the ship or deck cargo, including those due to the absorption of water and to icing;
30.1.3 as not to impair the weathertight or watertight integrity of part of the ship or its fittings or appliances, and to ensure the proper protection of ventilators and air pipes;
30.1.4 that its height above the deck, or another part of the ship on which it stands will not interfere with the navigation or working of the ship;
30.1.5 that it will not interfere with, or obstruct access to, the ship's steering arrangements, including emergency steering arrangements;
30.1.6 that it is in accordance with paragraph 15.6.
Securing of deck cargo
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30.2 Deck cargo must be so secured as to ensure, as far as practicable, that there will be no movements of that cargo relative to the ship in the worst sea and weather conditions which may normally be expected on the voyage; and lashings and all fittings used for their attachment must be of adequate strength for that purpose.
Maximum height of timber deck cargo
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30.3 Timber deck cargo carried by a ship within a Winter seasonal area during the period specified as the Winter period must be so stowed that at no point throughout its length does the height of the deck cargo above the level of the weather deck at side exceed one third of the extreme breadth of the ship.
Access
30.4.1 If timber deck cargo occupies the whole or substantially the whole of the uncovered space on the deck of a ship, means of access must be provided for the crew between their quarters and the machinery spaces and other parts of the ship used in the working of the ship, as follows.
30.4.2 The means of access must be provided in the form of a walkway fitted over the timber deck cargo, and the walkway must be —
30.4.2.1 as near as practicable on the centreline of the ship;
30.4.2.2 not less than six hundred millimetres in width; and
30.4.2.3 provided with a lifeline which, if practicable, has a wire rope set taut with a stretching screw.
30.4.3 In addition guard rails or lifelines spaced not more than three hundred and fifty millimetres apart vertically shall be provided on each side of the deck cargo to a height of at least one metre above the cargo.
30.4.4 The stanchion supports to all guard rails and lifelines must be so spaced as to prevent undue sagging.
Uprights
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30.5 If the nature of the timber is such that uprights are necessary in order to comply with subparagraphs 30.6 and 30.7, uprights must be fitted which are of sufficient strength for the purpose and be secured in position by angles or metal sockets of sufficient strength for the purpose or by equivalent means and must be so spaced as to provide efficient support taking into account the nature and length of the timber, However the space between two uprights fore and aft must not exceed three metres.
Stowage of timber deck cargo in relation to superstructures
30.6.1 Timber deck cargo stowed in well between superstructures must be stowed as solidly as possible so as to extend over the entire available length of the well to a height not less than the standard height of a superstructure other than a raised quarter deck.
30.6.2 Timber deck cargo stowed in a position having a limiting superstructure at the forward end but no such superstructure at the after end must be stowed so as to extend over the entire available length between the superstructure and the after end of the aftermost hatchway, to the height and in the manner specified in subparagraph 30.6.1.
Securing of Timber deck cargo
30.7.1 Timber deck cargo must be efficiently secured throughout its length by independent overall lashings spaced not more than three metres 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 three metres. The distance from an end bulk head of a superstructure to the first eye plate must be not more than two metres. Where there is no bulkhead, eye plates and lashings must be provided at distances of zero point six metres and fifteen metres from the ends of the timber deck cargo.
30.7.2 Lashings must be of not less than nineteen millimetres close link chain or of flexible wire rope of equivalent strength, fitted with sliphooks and turnbuckles so positioned as to be accessible at all times. Wire rope lashings must have a length of long link chain sufficient to permit the length of lashings to be regulated.
30.7.3 When timber is in lengths less than three point six metres, the spacing of the lashings must be reduced or suitable provision made to suit the length of timber.