Appendix IV
Extracts from the M.S. (Load Lines) Rules, 1968
Part V
GENERAL
Information as to sawn of ships
30.(1) The owner of any ship to which freeboards are assigned under these Rules shall provide for the guidance of the master of the ship information relating to the stability of the ship in accordance with the following provisions of this Rule.
(2) Except as otherwise provided in paragraph (6) of this Rule, such information shall include particulars appropriate to the ship in respect of all matters specified in Schedule 7 to these Rules and shall be in the form required by that Schedule.
(3) Subject to the following paragraph, the information shall, when rust supplied, be based on the determination of stability by means of an inclining test which shall unless the Board otherwise permits be carried out in the presence of a surveyor appointed by the Board. The information first supplied shall be replaced by fresh information whenever its accuracy is materially affected by alteration of the ship. Such fresh information shall if the Board so require be band on a further inclining test.
(4) The Board may
(a) in the case of any ship allow the information to be based on the determination, by means of an inclining test, of the stability of a sister ship; (b) in the case of a ship specially designed for the carriage of liquids or ore in bulk, or of any class of such ships, dispense with an inclining test if satisfied from the information available in respect of similar ships that the ship's proportions and arrangements are such as to ensure more than sufficient stability in all probable loading conditions.
(5) The information, and any fresh information to replace the same pursuant to paragraph (3) of this Rule, shall before issue to the master be submitted by 6r on behalf of the owner of the ship to the Board for their approval, together With a copy thereof for retention by the Board, and shall incorporate such additions and amendments as the Board may in any particular case require.
(6)(a) The owner of any ship which, by virtue of the Merchant Shipping (Load Lines) (transitional Provisions) Regulations 1968, is to be treated u a ship to which freeboards have been assigned under these Rules shall provide for the information of the master such information relating to the stability of the ship as was required to be so provided under the law in force immediately prior to the coming into operation of these Rules (a).
(b) The requirement in the preceding sub-paragraph shall have effect in relation to any ship [o which it applies until the date on which the load line certificate currently in force in respect of the ship on the date these Rules come into operation ceases to be valid.
(7) Information provided pursuant to the foregoing provisions of this Rule shall be furnished by the owner of the ship to the master in the form of a book which shall be kept on the ship at all times in the custody of the master.
Information as to loading, and ballasting of ships
31.-(1) The owner of any ship to which freeboards are assigned under these Rules, being a ship of more than ISO metres in length specially designed for the carriage of liquids or ore in bulk, dull provide for the information of the master information relating to the loading and ballasting of the ship in accordance with do following provisions of this Rule.
(2) Such information shall consist of working instructions specifying in detail the manner in which the ship u to be loaded and ballasted so as to avoid the creation of unacceptable stresses in her structure and shall indicate the maximum Stresses permissible for the ship.
(3) The provisions of paragraph (5) of the preceding Rule shall have effect in suspect of information required under this Rule, and the information duly approved in accordance with that paragraph shall be contained in the book to be furnished to the master of the ship pursuant to paragraph (7) of that Rule, so however that the information to be provided pursuant to each Rule is separately shown in the book under separate headings specifying the number and heading of each Rule.
Part 1
SHIPS IN GENERAL
Structural Strength and Stability
2.-(1) The construction of the ship shall be such that her general structural strength will be sufficient for the freeboards to be assigned to her.
(a) See section IS of the Merchant Shipping (Safety Convention) Act 1949 (12, 13, & 14 Geo. 6 c 43) and section 14 of the Merchant Shipping Act 1964 (1964 c 47).
(2) The design and construction of the ship shall be such u to ensure that her stability in ad probable loading conditions will be sufficient for the freeboards to be assigned to her, and for this purpose regard shall be had, in addition to the intended service of the ship and to any relevant requirements of Rules node under the Merchant Shipping(Safety Convention) Act 1949(a) and the Merchant Shipping Act 1964 (b), to the following criteria:
(a) The Area under this mm of Righting Levers (GZ curve) shall not be less than
(i) 0.055 metre-radians up to an angle of 30 degrees;
(ii) 0.09 metre-radians up to an angle of either 40 degrees or the angle at which the lower edges of any openings in the hull, superstructures or deckhouses, being openings which cannot be closed weathertight, are immersed if that angle be less;
(iii) 0.03 metre-radians between the angles of heel of 30 degrees and 40 degrees or such lesser angle as is referred to in (ii ).
(b) The Righting Lever (GZ) shall be at least 0.20 metres at in angle of heel equal to or greater than 30 degrees.
(c) The maximum Righting Lever (GZ) shall occur at an angle of heel not less than 30 degrees.
(d) The initial transverse metacentric height shall not be less than 0.15 metres. In the caw of a ship carrying a timber deck cargo which complies with sub-paragraph (a) by taking into account the volume of timber deck caw the initial transverse metacentric height shall not be less than 0.05 metres
(3) To determine whether the ship complies with the requirements of subparagraph (2) the ship shall, unless the Board otherwise permit, be subjected to an inclining test carried out in the presence of s surveyor appointed by the Board, and the Board shall notify the Assigning Authority whether or not they are satisfied that the ship complies with those requirements.
(a) 1949 12, 13 &14 Geo. 6 c.43. (b) 1964 c.47.
SCHEDULE 7
Information as to Stability of Ships (Rule 30)
The information relating to the stability of a ship to be provided for the master pursuant to Rule 30 of these Rules shall include particulars appropriate to the ship of the matters specified below. Such particulars shall be in the form of a statement unless the contrary is indicated.
1. The ship's name, official number port of registry, gross and register tonnages, principal dimensions, displacement, deadweight and draught to the Summer load line.
2. A profile view and, if the Board so require in a particular cam, plan vim of the ship drawn to sale showing with their names all compartments, ranks, storerooms and crew and passenger accommodation spaces, and also showing the mid-length position.
3. The capacity and the centre of gravity (longitudinally and vertically) of every compartment available for the carriage of cargo, fuel, stores, feed water domestic water or water ballast.
In the case of a vehicle ferry, the vertical centre of gravity of compartments for the carriage of vehicles shall be based on the estimated centres of gravity of the vehicles and not on the volumetric centres of the compartments.
4. The estimated total weight of (a) passengers and their effects and (b) crew and their effects, and the centre of gravity (longitudinally and vertically) of each such total weight. In assessing such centres of gravity passengers and crew shall be assumed to be distributed about the ship in the spaces they will normally occupy, including the highest decks to which either or both have access.
5. The estimated weight and the disposition and centre of gravity of the maximum amount of deck cargo which the ship may reasonably be expected to carry on an exposed deck The estimated weight shall include in the case of deck cargo Likely to absorb water the estimated weight of water likely to be so absorbed and allowed for in arrival conditions, such weight in the care of timber deck cargo being taken to be 15 percent by weight.
6. A diagram or scale showing the bad line mark and load lines with particulars of the corresponding freeboards, and also showing the displacement, metric tons per centimetre immersion, and deadweight corresponding in each can to a range of mean draughts extending between the waterline representing the deepest bad line and the waterline of the ship in Light condition.
7. A diagram or tabular statement showing the hydrostatic particulars of the ship, including:
(I) the heights of the transverse metacentre and
(2) the values of the moment to change trim one centimetre,
for a range of mean draughts extending at least between the waterline representing the deepest bad line and the waterline of the ship in light condition. Where a tabular statement is used, the intervals between such draughts shall be sufficiently Close to permit accurate interpolation. In the case of ships having raked keels, the same datum for the heights of centres of buoyancy and metacentres shall be used as for the centres of gravity referred to in paragraphs 3, 4 and 5.
8. The effect on stability of free surface in each tank in the ship in which liquids may be carried, including an example to show how the metacentric height is to be corrected.
9.-(1) A diagram showing cross curves of stability indicating the height of the assumed axis from which the Righting Levers are measured and the trim which has been assumed. In the case of ships having raked keels, where a datum other then the top of keel has been used the position of the assumed axis shall be clearly defined.
(2) Subject to the following subparagraph, only (a) enclosed superstructures and (b) efficient trunks u defined in paragraph 10 of Schedule 5 shall be taken into account in deriving such curves.
(3) The following structures may be taken into account in deriving such curves if the Hoard are satisfied that their location, integrity and means of downs will contribute to the ship's stability:-
(a) Superstructures located above the superstructure deck;
(b) deckhouses on or above the freeboard deck, whether wholly or in part only: (c) hatchway structures on or above the freeboard deck
Additionally, in the can of & ship carrying timber deck cargo, the volume of the timber deck cargo, or a part thereof, may with the Board's approval be taken into account in deriving a supplementary cure of stability appropriate to the ship when carrying such cargo.
(4) M example shall be given showing how to obtain a curve of Righting Levers (GZ) from the cross curves of stability.
(5) Where the buoyancy of a superstructure is to be taken into account in the calculation of stability information to be supplied in the case of a vehicle ferry w similar ship having bow doors, ship's side doors or stem doors, there shall be included in the stability information a specific statement that such doors must be secured weather-tight before the ship proceeds to us and that the cross curves of stability are based upon the assumption that such doors have been so secured.
10. (1) The diagram and statements referred to in sub-paragraph (2) of that paragraph shall be provided separately for each of the following conditions of the ship:- _
(a) Lights condition. If the ship has permanent ballast, such diagram and state. merits shall be provided for the ship in light condition both (i) with such ballast, and (ii) without such ballast.
(b) Ballast condition, both (i) on departure, and (ii) on arrival, it being assumed for the purpose of the latter in this and the following sub-paragraphs that oil fuel, fresh water, consumable stores and the like are reduced to 10 per ant of their capacity.
(c) Condition both (i) on departure, and (ii) on arrival, when loaded to the Summer load line with cargo filling all spaces available for cargo, cargo for this purpose being taken to be homogeneous cargo except where this is clearly inappropriate, for example in the can of cargo spaces in a ship which are intended to be used exclusively for the carriage of vehicles or of containers.
(d) Service loaded conditions, both (i) on departure and (ii) on arrival
(2) (a) A profile diagram of the ship drawn to a suitable small scale showing the disposition of all
components of the deadweight.
(b) A statement showing the light weight, the disposition and the total weights of all components of the deadweight, the displacement, the corresponding positions of the centre of gravity, the metacentre and also the metacentric height (GM).
(c) A diagram showing a curve of Righting Levers (GZ) derived from the crass curves of stability referred to in paragraph 9. Where credit is shown for the buoyancy of a timber deck cargo the curve of Righting Levers (GZ) must be drawn both with and without this credit.
(3) The metacentric height and the curve of Righting Levers (GZ) shall be corrected for liquid free surface.
(4) Where them is a significant amount of trim in any of the conditions referred to in sub-paragraph (I) the metacentric height and the curve of Righting Levers (GZ) may be required to be determined from the trimmed waterline.
(5) If in the opinion of the Board the stability characteristics in either or both of the conditions referred to in sub-paragraph (1) (c) are not satisfactory, such conditions shall be marked accordingly and an appropriate warning to the master shall be inserted.
ll. Where special procedures such as partly filling or completely filling particular spaces designated for cargo, fuel, fresh water or other purposes are necessary to maintain adequate stability, a statement of instructions as to the appropriate procedure in each case.
12. A copy of the report on the inclining test and of the calculation there from I of the light condition particulars.
Merchant Shipping (Safety Convention) Act, 1949
Section 18-(1) There shell be carried on board every British ship registered in i the United Kingdom whose keel u laid after the commencement of this Act such information in writing about the ship': stability as is necessary for the guidance of the master in loading and ballasting the ship.
(2)The said information shall be in such a form as may be approved by the Minister (who may approve the provision of the information in the form of a diagram or drawing only) and shall be based on the determination of the strip's stability by means of an inclining test of the ship:
Provided that the Minister may allow the information to be based on a similar determination of the stability of a sister ship.
(3)When any information under this section is provided for any ship, the owner shall tend a copy thereof to the Minister:
Provided that the owner shall not be required to sends copy of any information to the Minister it a previous copy of the same information his been sent to the Minister.
(4)If any such ship proceeds, or attempts to proceed, to sea without such information u aforesaid on board, the owner or master of the ship shall be liable to a fine not exceeding one hundred pounds; and if the owner of any ship contravenes the last preceding subsection. he shall be liable to a like fine.
(5)It is hereby declared that for the purposes of section two hundred and fifty-eight of the principal Act (which requires documents relating to navigation to be delivered by the master of a ship to his Successor) information under this section shall be deemed to be a document relating to the navigation of the ship. Section 29-(1) Nothing in this Act
(c) requiring information about a ship's stability to be carried on board; shall, unless in the case of information about a ship's stability the Minister otherwise orders, apply to any troopship, pleasure yacht or fishing vessel, or to any ship of Less than five hundred tons gross tonnage other than a passenger steamer or to any ship not propelled by mechanical means.
Appendix V
Department of Transport Syllabuses
CLASS S CERTIFICATE OF COMPETENCY
General Ship Knowledge
(a) General ideas on ship construction and on plans available a board ship. General pumping arrangements.
General definition of main dimensions. The names of the principal pub of a ship.
(b) General understanding of:
Displacement;
Deadweight;
Buoyancy; Reserve buoyancy: understanding of fundamental actions to be taken in the event of partial loss of intact buoyancy.
Use of displacement and tonnes per centimetre immersion scales to determine weight of cargo or ballast from draughts or freeboard.
Load line marks.
Effect of density of water on draught and freeboard. Fresh water allowance.
(c) (i) General understanding of:
Centre of gravity
Centre of buoyancy
Metacentric height Righting [ever Righting moment
(ii) The use of stability and hydrostatic data supplied to ships, including stability data in simplified form.
The effect of adding and removing weights. The danger of slack tanks.
(iii) Rigging a ship for loading and discharging cargo, the use of derricks, winches and cranes.
"Lining up" pipelines on oil products carriers.
The stowage and securing of argon including bulk cargoes. A know ledge of the safety precautions to be taken during the loading and charging of bulk oil, chemicals and other dangerous commodities Ventilation system of holds and tanks.
CLASS 4 CERTICATE OF COMPETENCY
General Ship, Knowledge
(a) General ideas on ship construction and on plans available onboard ship.
General definitions of main dimensions.
The names of the principal parts of a ship.
The candidate will be expected to show his practical acquaintance with:
Longitudinal and transverse framing
Bums and beam knees
Watertight bulkheads
Hatchways and dosing appliances
Rudders
Steering gear
Shell and dock plating
Double bottoms and peak tanks Bilges
Side and wing tanks
Stern frames
Propellers and propeller shafts
Stern tubes
Sounding pipes
Air pipes
General pumping arrangements
The stiffening and strengthening to resist panting, pounding and longitudional stresses.
Cause and prevention of corrosion in a ship's structure.
(b) General ideas on welding, riveting and burning and the precautions to be tab when such processes are carried out aboard ship.
(c) (i) The meaning of the terms: Block co-efficient; Displacement; Deadweight
(ii) Density, relative density; Principle of Archimedes flotation. Effect of density of water on draught and freeboard. Fresh water allowance. The marine hydrometer and its uses.
(d) Care and maintenance of all life saving and rim fighting appliances, lights an sound signalling apparatus.
(e) The use of Simpson's rules m the computation of areas, volumes and centroids.
CLASS 4 CERTIFICATE OF COMPETENCY
Operational Safety
(a) Use of displacement and tonnes pa centimetre immersion scales to determine weight of cargo or ballast fram draughts or freeboard.
Load hot-marks.
Buoyancy; Reserve buoyancy; understanding of fundamental actions to be taken in the event of partial loss of intact buoyancy.
(b) (i) General understanding with definitions of:
Centre of gravity, stable, unstable and neutral equilibrium.
Metacentric height Righting lever Righting moment
(ii) The use of stability and hydrostatic data supplied to ships.
The effect of adding and removing weights.
The danger of slack tanks.
(c)...
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