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1 For the purposes of this Schedule, except where otherwise specified,
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3 The assumptions of permeability, which shall be taken into account in determining the floodable length at any point in ships to which this Division applies, shall be as follows:
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-
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-
(2) Subject to subsection (4), in the case of ships the length of which is less than 131 m but not less than 79 m having a criterion numeral of not less than
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(hereinafter in this section referred to as S), the factor of subdivision F shall be determined by the following formula:
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5 The criterion numeral for ships to which this Division applies shall be determined by the following formulae:
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-
(a) where the value of 0.056LN is greater than the sum of P and the whole volume of the passenger spaces above the margin line, the figure to be taken as P1 shall be that sum or 0.037LN whichever is the greater;
-
(b) values of Cs less than 23 shall be taken as 23; and
-
(c) values of Cs greater than 123 shall be taken as 123.
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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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7 Subject to the modifications set forth in this Division, the maximum length of compartments in ships to which this Division applies shall be determined as if they were ships to which Division II applies.
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8 In ships to which this Division applies, the assumed average permeability throughout the portions of the ship before and abaft the machinery space shall be determined
-
(a) by the following formula:
95 - 35b / v
where
- b =
- the volume of the spaces that are situated below the margin line before or abaft the machinery space, as the case may be, and above the tops of floors, inner bottom, or peak tanks, and which are appropriated for use as coal or oil fuel bunkers, store rooms, baggage rooms, mail rooms, chain lockers or fresh water tanks and of spaces appropriated for cargo if the Board is satisfied the greater part of the volume of the space is intended to be occupied by cargo; and
- v =
- v =the volume of the portion of the ship below the margin line before or abaft the machinery space, as the case may be; or
-
(b) if the Board so determines in the case of any ship, after receipt of a plan of the ship showing the watertight subdivision thereof, by detailed calculation, for the purpose of which the permeability of spaces shall be assumed to be as follows:
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spaces appropriated to cargo, tanks forming part of the structure of the ship and double bottoms 
95,
or such lesser figure as the Board may permit in the case of any ship.
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-
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-
(2) If in the case of any ship to which this Division applies the Board is satisfied that the quantity of cargo to be carried in the ship will be such as to render impracticable the application abaft the collision bulkhead of a factor of subdivision not exceeding 0.5, the factor of subdivision of the ship shall be determined as follows:
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10 In accordance with section 2 of this Schedule, the method described in this Division should generally be adopted to develop flooding curves to indicate the floodable length at any point in the ship; for the purpose of this method, the floodable length is expressed as a percentage of the length of the ship.
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11 In this Division,
-
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-
(d) the corrected margin line, if the actual margin line either forward or aft is not of ordinary parabolic form or if its lowest point is not at amidships, a margin line of ordinary parabolic form shall be drawn with its apex amidships level with the lowest point of the actual margin line, and intersecting the latter either at a point one quarter of the ship’s length from amidships or at the perpendicular according as the actual sheer at the perpendicular is respectively greater or less than four times the actual sheer at the one-quarter length position, (see Fig. A in this Schedule);
-
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-
(h) the length of the ship (L) is the length of a ship measured between the perpendiculars taken at the extremities of the deepest subdivision load water line, (section 2); no adjustment to this length will, as a general rule, be necessary unless the sectional area at the after perpendicular exceeds one tenth of the midship sectional area, in which case full particulars shall be submitted in order that an equitable length may be determined;
-
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-
(k) the freeboard (f) is the vertical distance amidships from the subdivision load water line to the margin line (corrected as necessary);
-
(l) the block coefficient of fineness of displacement to the subdivision load water line shall be determined as follows: volume of displacement to moulded lines divided by (L.B.d.);
-
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-
(n) the sheer ratio forward or aft is the ratio of the sheer of the margin line (corrected as necessary) at the forward or after perpendicular respectively, measured from the horizontal line through the lowest point of the margin line (corrected as necessary), to the draught;
-
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-
(r) the Standard Diagrams of Floodable Lengths, etc. (or Plates) are as set out in section 12 of this Schedule and the Plates referred to are the numbered Diagrams in that section.
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12
-
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-
(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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-
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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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where a and a1 are the area coefficients of the mean water planes of the standard form and the new form respectively and ß and ß1 are the sectional area coefficients of the standard form and the new form respectively at MP and M1P1; the sign to be used in the last factor of the above expressions will be + when the centre of flotation of the mean water plane of the new form is before, and - when it is abaft, that of the standard form for sections forward of the centre of flotation, and the opposite sign for sections abaft the centre of flotation; this work may be conveniently arranged as in Specimen 3;
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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) Required Factor: F = 0.50 (or as determined by the formula, whichever is the less in the case of ships exceeding 137.2 m in length) |
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| † As corrected. |
I have carefully checked the Builders calculations and am satisfied that the particulars shown on this Form are correct. |
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