Annex I REGULATIONS CONSTRUCTION REGULATION I (1) The subdivision loadline is the waterline used in determining the subdivision of the ship. The deepest subdivision loadline is that which corresponds to the greatest draught. (2) The length of the ship is the length measured between perpendiculars taken at the extremities of the deepest subdivision loadline. (3) The breadth of the ship is the extreme width from outside of frame to outside of frame at or below the deepest subdivision loadline. (4) The bulkhead deck is the uppermost deck up to which the transverse watertight bulkheads are carried. (5) The margin line is a line drawn parallel to the bulkhead deck at side and 3 inches (76 millimetres) below the upper surface of that deck at side. (6) The draught is the vertical distance from the top of keel amidships to the subdivision loadline in question. (7) The permeability of a space is the percentage of that space which can be occupied by water. The volume of a space which extends above the margin line shall be measured only to the height of that line. (8) The machinery space is to be taken as extending from the top of keel to the margin line and between the extreme main transverse watertight bulkheads bounding the spaces devoted to the main and auxiliary propelling machinery, boilers when installed, and all permanent coal bunkers. (9) Passenger spaces are those which are provided for the accommodation and use of passengers, excluding baggage, store, provision and mail rooms. For the purposes of Regulations III and IV, spaces provided below the margin line for the accommodation and use of the crew shall be regarded as passenger spaces. (10) In all cases volumes shall be calculated to moulded lines. REGULATION II Floodable Length (1) The floodable length at any point of the length of a ship shall be determined by a method of calculation which takes into consid 36 eration the form, draught and other characteristics of the ship in question. (2) In a ship with a continuous bulkhead deck, the floodable length at a given point is the maximum portion of the length of the ship, having its centre at the point in question, which can be flooded under the definite assumptions hereafter set forth in Regulation III without the ship being submerged beyond the margin line. (3) In the case of a ship not having a continuous bulkhead deck, the floodable length at any point may be determined to an assumed continuous margin line, up to which, having regard to sinkage and trim after damage, the sides of the ship and the bulkheads concerned are carried watertight. REGULATION III (1) The definite assumptions referred to in Regulation II relate to the permeabilities of the spaces below the margin line. In determining the floodable length, a uniform average permeability shall be used throughout the whole length of each of the following portions of the ship below the margin line: (a) the machinery space as defined in Regulation I (8); (b) the portion forward of the machinery space; and (c) the portion abaft the machinery space. (2)(a) For steamships the uniform average permeability throughout the machinery space shall be determined from the formula 80+12.5(a), where a = volume of the passenger spaces, as defined in Regulation I (9), which are situated below the margin line within the limits of the machinery space. c = volume of between deck spaces below the margin line within the limits of the machinery space which are appropriated to cargo, coal or stores. v = whole volume of the machinery space below the margin line. (b) For ships propelled by internal combustion engines, the uniform average permeability shall be taken as 5 greater than that given by the above formula. (c) Where it is shown to the satisfaction of the Administration that the average permeability, as determined by detail calculation, is less than that given by the formula, the calculated value may be substituted. For the purposes of such calculation, the permeabilities of passenger spaces, as defined in Regulation I (9), shall be taken as 95, that of all cargo, coal and store spaces as 60, and that of double bottom, oil fuel and other tanks at such values as may be approved in each case by the Administration. (3) The uniform average permeability throughout the portion of the ship before (or abaft) the machinery space shall be determined from the formula 63+35 - where a = volume of the passenger spaces, as defined in Regulation I (9), which are situated below the margin line, before (or abaft) the machinery space, and v = whole volume of the portion of the ship below the margin line before (or abaft) the machinery space. (4) If a between deck compartment between two watertight transverse bulkheads contains any passenger or crew space, the whole of that compartment, less any space completely enclosed within permanent steel bulkheads and appropriated to other purposes, shall be regarded as passenger space. If, however, the passenger or crew space in question is completely enclosed within permanent steel bulkheads, only the space so enclosed need be considered as passenger space. REGULATION IV Permissible Length of Compartments (1) Factor of Subdivision.-The maximum permissible length of a compartment having its centre at any point in the ship's length is obtained from the floodable length by multiplying the latter by an appropriate factor called the factor of subdivision. The factor of subdivision shall depend on the length of the ship, and for a given length shall vary according to the nature of the service for which the ship is intended. It shall decrease in a regular and continuous manner (a) as the length of the ship increases, and (b) from a factor A, applicable to ships primarily engaged in the carriage of cargo, to a factor B, applicable to ships primarily engaged in the carriage of passengers. The variations of the factors A and B shall be expressed by the following formulæ (i) and (ii) where L is the length of the ship as defined in Regulation I (2): (2) Criterion of Service.-For a ship of given length the appropriate factor of subdivision shall be determined by the Criterion of Service Numeral (hereinafter called the Criterion Numeral) as given by the following formulæ (iii) and (iv) where: = C, the Criterion Numeral; L= length of the ship, as defined in Regulation I (2); M = the volume of the machinery space, as defined in Regulation I (8); with the addition thereto of the volume of any permanent oil fuel bunkers which may be situated above the inner bottom and before or abaft the machinery space; P= the whole volume of the passenger spaces below the margin line, as defined in Regulation I (9); = V the whole volume of the ship below the margin line; N=number of passengers for which the ship is to be K has the following values: Value of K Length in feet and volumes in cubic feet. .6 L metres... .056 L Where the value of KN is greater than the sum of P and the whole volume of the actual passenger spaces above the margin line the lower figure may be taken provided that the value of P1 used is not less than 23 KN. For ships not having a continuous bulkhead deck the volumes are to be taken up to the actual margin lines used in determining the floodable lengths. (3) Rules for Subdivision.—(a) The subdivision abaft the fore peak of ships 430 feet (131 metres) in length and upwards having a criterion numeral of 23 or less shall be governed by the factor A given by formula (i); of those having a criterion numeral of 123 or more by the factor B given by formula (ii); and of those having a criterion numeral between 23 and 123 by the factor F obtained by linear interpolation between the factors A and B, using the formula: F=A (A-B) (C.-23) 100 ·(v) Where the factor F is less than .40 and it is shown to the satisfaction of the Administration to be impracticable to comply with the factor F in a machinery compartment of the ship, the subdivision of such compartment may be governed by an increased factor, which, however, shall not exceed .40. (b) The subdivision abaft the fore peak of ships less than 430 feet (131 metres) but not less than 260 feet (79 metres) in length having a criterion numeral equal to S, where S= 3574-25L 13 9382-20L (L in feet) (L in metres) shall be governed by the factor unity; of those having a criterion numeral of 123 or more by the factor B given by the formula (ii); of those having a criterion numeral between S and 123 by the factor F obtained by linear interpolation between unity and the factor B, using the formula: F-1 (1-B) (C,-S) (vi) (c) The subdivision abaft the fore peak of ships less than 430 feet (131 metres) but not less than 260 feet (79 metres) in length and having a criterion numeral less than S, and of all ships less than 260 feet (79 metres) in length shall be governed by the factor unity, unless it is shown to the satisfaction of the Administration to be impracticable to comply with this factor in any part of the ship, in which case the Administration may allow such relaxation as may appear to be justified, having regard to all the circumstances. (d) The provisions of sub-paragraph (c) shall apply also to ships of whatever length, which are to be certified to carry a number of pasL2 (in feet) (L2 (in metres) sengers exceeding 12 but not exceeding 7000 or 50, whichever is the less. REGULATION V Special Rules concerning Subdivision 650 (1) A compartment may exceed the permissible length determined by the rules of Regulation IV provided the combined length of each pair of adjacent compartments to which the compartments in question is common does not exceed either the floodable length or twice the permissible length, whichever is the less. If one of the two adjacent compartments is situated inside the machinery space, and the second is situated outside the machinery space, and the average permeability of the portion of the ship in which the second is situated differs from that of the machinery space, the combined length of the two compartments shall be adjusted to the mean |