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• 6 (1) Compartments exceeding the permissible length:

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  • (d) where in any portion of a ship bulkheads required by these Regulations to be watertight are carried to a higher deck than in the remainder of the ship, separate margin lines may be used for calculating the floodable length of that portion of the ship, if

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• (3) If a bulkhead required by these Regulations to be watertight is stepped, it shall comply with one of the following conditions:

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• (5) Where a bulkhead required by these Regulations to be watertight is recessed or stepped, an equivalent plane bulkhead shall be assumed in determining the subdivision.

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• (6) If the distance between two adjacent bulkheads required by these Regulations to be watertight, or their equivalent plane bulkheads, or the distance between transverse planes passing through the nearest stepped portions of the bulkheads, is less than 0.03L + 3.05 m, or 10.67 m, or 0.1L, whichever is the least, only one of those bulkheads shall be regarded as forming part of the subdivision of the ship; for Class V and Class VIII vessels, this minimum spacing shall be applicable between peak bulkheads.

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• (d) the size and shape of a flooding curve depend principally on the freeboard ratio and on the assumed permeability; they depend, also, to a smaller extent, on the character of the lines of the vessel and on the sheer of the margin lines forward and aft; using the same vertical and horizontal scales for percentage of length, the ends of a flooding curve terminate on straight lines drawn through points in the base line representing the position of the fore and after perpendiculars, at an angle θ, where tan θ = 2; these lines are called the forward and after terminals respectively;

• (e) in order to determine curves of floodable length for any ship the Standard Diagrams should be used; these give floodable lengths (for the two permeabilities 60 per cent and 100 per cent), for a definite standard family of ship forms of differing block coefficients, freeboard ratios and sheer ratios; the floodable lengths obtained are in every case to be set off at right angles to the base line of the floodable length curve; for the two permeabilities mentioned, the curves of floodable length for any vessel of the standard form can be obtained directly from the cross curves given in the Plates, by the method indicated on Plate II; while for any other permeability the appropriate curve may be obtained (including terminal points) as follows:

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• (g) if the ship under consideration conforms to standard type, that is to say, if the coefficients (see Specimen 1) agree with those given on Plates XXVI and XXVII for the standard form, the floodable length curve determined as above will hold good for the ship; if, however, there are differences in these respects, the curve obtained as above should be modified as follows:

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• (j) the curves of permissible length are obtained from the curve of floodable length by using the appropriate factor of subdivision and it will be noted that these curves will not extend at the ends of the terminal lines; they can, however, be drawn in when required with sufficient accuracy, by means of the construction shown in Fig. 2; make A B = 2 A D, and B C = 4 D E, A being the lowest point of the curve of permissible length, and A B horizontal; then a fair curve may be drawn through A E C to meet the terminal line as shown in the diagram.

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1 The sufficiency of intact stability of every ship to which Part I of these Regulations applies shall be determined by calculation, which has regard to the design and construction of the ship and the damaged compartments and is in accordance with the following assumptions:

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3 Automatic equalization measures are preferable and complete details in this regard shall be submitted with the calculations; all pipes concerned shall be of suitable area to permit rapid counter flooding; where air and filling or overflow pipes are led to a common main, care shall be taken that in the event of damage there is no leakage to intact compartments through these or any other pipes.

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