# Hull Construction Regulations (C.R.C., c. 1431)

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Regulations are current to 2024-05-01 and last amended on 2023-12-20. Previous Versions

## SCHEDULE I(Sections 2, 9, 15 and 16)Calculation of Maximum Length of Watertight Compartments

#### DIVISION I

##### General

**1**For the purposes of this Schedule, except where otherwise specified,(a) all linear measurements shall be in metres;

(b) all volumes shall be in cubic metres and shall be calculated from measurements taken to moulded lines;

(c) the symbol “L” denotes the length of the ship;

(d) the expression “passenger spaces” shall include galleys, laundries and other similar spaces provided for the service of passengers, in addition to space provided for the use of passengers; and

(e) plans of the subdivision arrangements and calculations as follows shall be submitted:

(i) outline profile and plans showing the margin lines (corrected as necessary); all watertight transverse and longitudinal bulkheads, decks, inner skins, shaft and other tunnels, trunks and ventilators; recesses and steps in watertight bulkheads; double bottoms, the principal openings in the watertight bulkheads and decks and openings therein closed only by portable plates, the appropriation of spaces below the bulkhead deck; the positions of equivalent plane bulkheads; the lengths of the main transverse compartments and the weathertight arrangements at the forward end; tunnels, recesses and steps shall be shown in plan and elevation and typical sections of the double bottom shall be given, and

(ii) subdivision coefficients and particulars on forms BH2 and BH2A, calculations of equivalent plane bulkheads, allowances for local subdivision, flooding calculations and curves and the particulars required to enable the Board to determine whether a detailed calculation of permeability is required under clause 3(b)(i)(B) and paragraph 8(b).

##### Floodable and Permissible Lengths

**2**Subject to section 6 of this Schedule, the length of a compartment shall not exceed its permissible length; the permissible length of a compartment having its centre at any point shall be the product of the floodable length at that point and the factor of subdivision of the ship; to enable the permissible length of compartments to be determined, it will be necessary to develop flooding curves that will indicate the floodable length at any point in the ship; flooding curves should be developed by a method of calculation that takes account of the form, draught and other characteristics of the ship; the method described in Division IV of this Schedule should normally be used; if, however, the ship is of such unusual form that this method is not sufficiently accurate, the Board may permit the use of an alternative method of calculation.

#### DIVISION II

##### All Ships Referred to in Section 8 of Part I Except Ships of Class II and Class III Specified in Division III of this Schedule

**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:(a) machinery space:

(i) in the case of ships not propelled by internal combustion engines, the assumed average permeability throughout the machinery space shall be determined by the following formula:

80 + 12.5 ((a - c)) ÷ v

where

- a
- = volume of the passenger spaces and crew spaces below the margin line within the limits of the machinery space;
- c
- = volume of the between deck spaces below the margin line within the limits of the machinery space which are appropriated to cargo, coal or stores; and
- v
- = volume of the machinery space below the margin line,

(ii) in the case of ships propelled by internal combustion engines, the average permeability throughout the machinery space shall be taken as five greater than that given by the aforesaid formula, and

(iii) in any case in which the average permeability throughout the machinery space, as determined by detailed calculation, is less than that given by the aforesaid formula, the calculated value may be substituted; for the purposes of such calculation, the permeability of passenger spaces and crew spaces shall be taken to be 95, that of all spaces appropriated for cargo, coal or stores shall be taken to be 60, and that of double bottom, oil fuel and other tanks forming part of the structure of the ship shall be taken to be 95 or such lesser figure as the Board may approve in the case of that ship; and

(b) portions before and abaft the machinery space:

(i) the assumed average permeability throughout the portions of the ship before and abaft the machinery space shall be determined:

(A) by the following formula:

63 + 35 a ÷ v

where

- a
- = volume of the passenger spaces and crew spaces which are situated below the margin line before or abaft the machinery space, as the case may be; and
- v
- = 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 subdivisions thereof, by detailed calculation, for the purpose of which the permeability of spaces shall be assumed to be as follows:

passenger spaces 95

crew spaces 95

spaces appropriated to machinery 80

spaces appropriated to cargo, coal, stores or baggage rooms 60

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; and

(ii) for the purposes of this section, a space within a passenger space or crew space shall be deemed to be a part thereof unless it is appropriated for other purposes and is enclosed by permanent steel bulkheads.

##### Factor of Subdivision

**4**(1) Subject to subsection (4), in the case of ships the length of which is 131 m or more, the factor of subdivision F shall be determined by the following formula:F = A - ((A - B) (C

_{s}- 23)) ÷ 100where

- A and B
- are respectively determined in accordance with subsection (5) and C
_{s}is the criterion numeral determined in accordance with section 5 of this Schedule, provided that where in the case of any ship the factor F is less than 0.4 and the Board is satisfied that it is impracticable to apply the factor F in determining the permissible length of a compartment appropriated for machinery, the Board may allow an increased factor not exceeding 0.4 to be applied to that compartment.

(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

(3574 - 25L) ÷ 13

(hereinafter in this section referred to as S), the factor of subdivision F shall be determined by the following formula:

F = 1 ((1 - B) (C

_{s}- S)) ÷ (123 - S)where

- B
- is the factor determined in accordance with subsection (5) and C
_{s}is the criterion numeral determined in accordance with section 5 of this Schedule.

(3) In the case of ships the length of which is less than 131 m but not less than 79 m and having a criterion numeral less than S or in the case of ships the length of which is less than 79 m the factor of subdivision shall be unity.

(4) In the case of a ship of any length which is intended to carry a number of passengers exceeding 12 but not exceeding

L

^{2}÷ 650 or 50whichever is the lower, the factor of subdivision shall be determined in the manner provided in subsection (3).

(5) For the purposes of this subsection the factors A and B shall be determined by the following formulae:

A = 58.2 ÷ (L - 60) + 0.18 (where L = 131 and upwards)

B = 30.3 ÷ (L - 42) + 0.18 (where L = 79 and upwards).

##### Criterion of Service

**5**The criterion numeral for ships to which this Division applies shall be determined by the following formulae:When P

_{1}is greater than PC

_{s}= 72 (M + 2P_{1}) ÷ (V + P_{1}- P)and in all other cases

C

_{s}= 72 (M + 2P) ÷ Vwhere

- C
_{s} - = the criterion numeral;
- M
- = the volume of the machinery space, 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 volume of the passenger spaces and crew spaces below the margin line;
- V
- = the volume of the ship below the margin line;
- N
- = number of passengers which the ship is intended to carry; and
- P
_{1} - = 0.056LN

provided that:

(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 P

_{1}shall be that sum or 0.037LN whichever is the greater;(b) values of C

_{s}less than 23 shall be taken as 23; and(c) values of C

_{s}greater than 123 shall be taken as 123.

- C

##### Special Rules for Subdivision

**6**(1) Compartments exceeding the permissible length:(a) a compartment may exceed its permissible length provided that the combined length of each pair of adjacent compartments to which the compartment in question is common does not exceed either the floodable length or twice the permissible length, whichever is the lesser;

(b) if one compartment of either of such pairs of adjacent compartments is situated inside the machinery space, and the other compartment thereof is situated outside the machinery space, the combined length of the two compartments shall be adjusted in accordance with the mean average permeability of the two portions of the ship in which the compartments are situated;

(c) where the lengths of two adjacent compartments are governed by different factors of subdivision, the combined length of the two compartments shall be determined proportionately; and

(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

(i) the two compartments adjacent to the resulting step in the bulkhead deck are each within the permissible length corresponding to their respective margin lines and, in addition, their combined length does not exceed twice the permissible length determined by reference to the lower margin line of such compartments, and

(ii) the sides of the ship are extended throughout the ship’s length to the deck corresponding to the uppermost margin line and all openings in the shell plating below that deck throughout the length of the ship comply with the requirements of section 19 as if they were openings below the margin line.

##### Additional Subdivision at Forward End

(2) In ships 131 m in length and upwards, the watertight bulkhead next abaft the collision bulkhead shall be fitted at a distance from the forward perpendicular that is not greater than the permissible length appropriate to a compartment bounded by the forward perpendicular and such bulkhead.

##### Steps in Bulkheads

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

(a) in ships having a factor of subdivision not greater than 0.9, the combined length of the two compartments separated by such bulkhead shall not exceed 90 per cent of the floodable length or twice the permissible length, whichever is the lesser; in ships having a factor of subdivision greater than 0.9, the combined length of the two compartments shall not exceed the permissible length;

(b) additional subdivision is provided in way of the step to maintain the same measure of safety as that secured by a plane bulkhead; or

(c) the compartment over which the step extends does not exceed the permissible length corresponding to a margin line taken 76 mm below the step.

##### Recesses in Bulkheads

(4) If any part of a recess lies outside vertical surfaces on both sides of the ship situated at a distance from the shell plating equal to one fifth of the breadth of the ship and measured at right angles to the centre line at the level of the deepest subdivision load water line, the whole of such recess shall be deemed to be a step in a bulkhead for the purposes of subsection (3).

##### Equivalent Plane Bulkheads

(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.

##### Minimum Spacing of Bulkheads

(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.

##### Allowance for Local Subdivision

(7) Where in any ship a main transverse watertight compartment contains local subdivision and the Board is satisfied that, after any assumed side damage extending over a length of 0.03L + 3.05 m, or 10.67 m, or 0.1L, whichever is the least, the whole volume of the main compartment will not be flooded, a proportionate allowance may be made in the permissible length otherwise required for such compartment; in such a case the volume of effective buoyancy assumed on the undamaged side shall not be greater than that assumed on the damaged side.

#### DIVISION IIIShips of Class II and Class III to which Section 8 of Part I Applies That Are Permitted by the Board, in Exercise of its Power under Subsection 7(6) of the Life Saving Equipment Regulations to Carry Persons in Excess of the Lifeboat Capacity Provided on Board

##### General Rules for Subdivision

**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.

##### Assumption of Permeability in Portions Before and Abaft the Machinery Space

**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:

passenger spaces 95

crew spaces 95

spaces appropriated to machinery 80

spaces appropriated to bunker coal, stores or baggage rooms 60

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.

##### Factor of Subdivision

**9**(1) Subject to this section, the factor of subdivision of ships to which this Division applies shall be the factor determined in the manner provided in section 4 of this Schedule, or 0.5 whichever is the lesser, provided that if the Board is satisfied in the case of any ship, the length of which is less than 91.5 m, that it is impracticable to apply that factor to any compartment it may allow a higher factor to be applied to that compartment.(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:

(a) in the case of ships the length of which is 131 m and upwards, by the formula:

F = A - ((A - BB) (C

_{s}- 23)) ÷ 100(b) in the case of ships the length of which is less than 131 m but not less than 55 m, and having a criterion numeral not less than S

_{1}, by the formula:F = 1 ((1 - BB) (C

_{s}- S_{1})) ÷ (123 - S_{1})

for the purposes of the above formulae:

A = 58.2 ÷ (L - 60) + 0.18 (where L = 131 m and upwards)

BB = 17.6 ÷ (L - 33) + 0.20 (where L = 55 m and upwards)

S

_{1}= (3712 - 25L) ÷ 19- C
_{s} - = the criterion numeral determined in accordance with section 5 of this Schedule where P1 has the following values:
(i) 0.56LN or 3.55N whichever is the greater for berthed passengers,

(ii) 3.55N for unberthed passengers, and

(iii) in the case of ships the length of which is less than 131 m but not less than 55 m and having a criterion numeral less than S1, and of all ships the length of which is less than 55 m, the factor of subdivision shall be unity.

#### DIVISION IV

##### Flooding Curves and Tables

**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.

##### Definitions and Notes

**11**In this Division,(a) except where otherwise stated,

(i) all linear measurements shall be in metres,

(ii) all area measurements shall be in square metres, and

(iii) all volumes shall be in cubic metres and calculated to moulded lines;

(b) the

*load waterplane*is that used in determining the subdivision of the ship, and is drawn parallel to the keel;(c) the

*margin line*for a ship of standard form consists of two ordinary parabolas, each with apex at amidships and axis vertical, passing, at amidships and at the ends, through points 76 mm below the surface of the bulkhead deck at side;(d) the

*corrected margin line*, if the actual margin line either forward or aft is not of ordinary parabolic formFootnote^{*}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);(e) the

*perpendiculars*are taken at the extreme ends of the subdivision load water line;(f)

*amidships*is the middle of the length between the perpendiculars;(g) the

*mean waterplane*is midway between the load water plane and that drawn parallel thereto touching the lowest point of the margin line;(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;(i) the

*breadth of the ship*(B) is the greatest moulded breadth at or below the ship’s deepest subdivision load water line, (section 2);(j) the

*draught*(d) is the vertical distance from the moulded base line amidships to a subdivision load water line, (section 2);(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.);(m) the

*freeboard ratio*(f ÷ d) is the ratio between the freeboard (f) and the draught (d);(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;(o) the

*mean waterplane area coefficient*(a) is the actual area of mean waterplane divided by L × B;(p) the

*mean waterplane moment of inertia coefficient*(n) is the actual moment of inertia of mean waterplane about a transverse axis through its centre of flotation divided by L^{3}× B;(q) the

*sectional area coefficient*(ß) for any transverse section is the actual area of that section up to the margin line divided by B × d;(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.

Return to footnote

^{*}A margin or ordinary parabolic form is one in which the sheer forward and aft measured at points 1/8, 1/4 and 3/8 of the length of the ship from the perpendicular is 9/16, 1/4 and 1/16 respectively of the sheer at the perpendicular.

##### General Description of Method

**12**(a) 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 :

(i) the machinery space,

(ii) the portion forward of the machinery space, and

(iii) the portion abaft the machinery space;

(b) the assumptions of permeability appropriate to each Class of ship, which shall be taken into account for each of the above portions of the ship, are laid down in sections 3 and 8 of this Schedule;

(c) for a given ship, therefore, three flooding curves must in general be drawn more or less completely, corresponding to the three different permeabilities, the significant part of each curve depending on the position of the bulkheads bounding the machinery space;

(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:

if 1

_{1}be the floodable length at the point considered for permeability 100 per cent and 1_{2}be the floodable length at the point considered for permeability 60 per cent then the floodable length 1_{3}at that point for a permeability µ will be given by1

_{3}= 1_{1}+ 3 ÷ 2 (1_{2}- 1_{1}) (100 ÷ µ - 1)(f) a convenient method of arranging the work to obtain the required curves is indicated in Specimen 2;

(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:

let A, Fig. 1, mark the fore-and-aft position of the centre of flotation of mean waterplane of the standard form, and A

_{1}, that of the corresponding point for the ship under consideration, the horizontal distance between them being mL; take any point P on the standard form curve, distant χ from A, the ratio(χ ÷ L)

being represented by p, so that the value of p varies according to the position of P; the longitudinal position of the point P

_{1}, on the new curve, corresponding to the point P on the old, is given byχ

_{1}= χ × n_{1}÷ n × a ÷ a_{1}÷ (1 ± m ap ÷ n)where n and n

_{1}are the moment of inertia coefficients of the mean water plane of the standard form and the new form respectively; the length of the ordinate M_{1}p_{1}is given byM

_{1}P_{1}= MP × a_{1}÷ a x ß ÷ ß_{1}x (1 ± m ap ÷ n)where a and a

_{1}are the area coefficients of the mean water planes of the standard form and the new form respectively and ß and ß_{1}are the sectional area coefficients of the standard form and the new form respectively at MP and M_{1}P_{1}; 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;GRAPHIC IS NOT DISPLAYED, SEE C.R.C., C. 1431, P. 12150 AND 12151

(h) the coefficients required for a new ship may be conveniently recorded as indicated in Specimen 1, while the similar information for standard form is given on Plates XXVI and XXVII;

(i) it may be noted that, if the longitudinal position of the centre of flotation of mean water plane does not materially differ from that of the corresponding standard form, the factor

(1 ± m ap ÷ n)

may without material error be omitted for both length of ordinate and its position;

(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.

### Ships to which Part I of the Hull Construction Regulations applies, other than ships to which Division III of Schedule I of those Regulations applies.

#### Criterion Numeral (C_{S})

m^{3} | |||||

Subdivision Length (L)= | m | From summary | Volume of Ship (V) = | ||

No. of Passengers (N)= | Volume of Machinery Space (M) = | ||||

P_{1} = 0.056LN = | m^{3} | Volume of Passenger and Crew Space (P) = | |||

(1) P_{1} greater than P | (2) P_{1} not greater than P | ||||

C_{s} = 72 | ((M + 2P | = | C_{s} = 72 | ((M + 2P | = |

section 5Footnote for ^{*} |

Return to footnote

^{ *}The sections referred to above are those of Schedule I to the Hull Construction Regulations.

#### Factor of Subdivision (F)

(1) L = 131 m and upwards. |

Factor from Curve A : A = 58.2 ÷ (L - 60) + 0.18 = |

Factor from Curve B : B = 30.3 ÷ (L - 42) + 0.18 = |

Required Factor : F = A - ((A - B) (C |

subsection 4(1)Footnote for ^{*} |

(2) L = Less than 131 m and not less than 79 m (C_{s} not less than S) |

S = (3574 - 25L) ÷ 13 = Required Factor: F = 1 - ((1 - B) (C |

subsection 4(2)Footnote for ^{*} |

When C_{s} is less than S and in all ships less than 79 m in length the subdivision is to be governed by the factor unity. |

subsection 4(3)Footnote for ^{*} |

(3) In the case of a ship, of any length, that is intended to carry a number of passengers exceeding 12 but not exceeding L |

subsection 4(4)Footnote for ^{*} |

Return to footnote

^{ *}The sections referred to above are those of Schedule I to the Hull Construction Regulations.

#### Average Permeability (M) of After End

Passenger Spaces and Crew Spaces | (a) Footnote for ^{†} Footnote for ^{‡‡} | Whole Volume of | ||||

or Other Spaces | (b) Footnote for ^{‡} | after End | ||||

Compartment | Identification Measurements | Volume m^{3} | Longitudinal Extent | Volume m^{3} | ||

Length | Breadth | Depth | ||||

Abaft Bulkhead | ||||||

No | ||||||

(1) Total (V) = | ||||||

µ = 63+35a ÷ vFootnote for | ||||||

Footnote for ^{‡‡} = | ||||||

or 95-35 b ÷ vFootnote for | ||||||

(a) Footnote for ^{†} | ||||||

(4) Total or | Footnote for ^{‡‡} = | F.P.= (100 - µ) ÷ µ x 1.5 = | ||||

(b) Footnote for ^{‡} |

Return to footnote

^{†}Ships to which Part I of the Hull Construction Regulations applies other than ships to which Division III of Schedule I to those Regulations applies.Return to footnote

^{‡}Ships to which Division III of Schedule I to the Hull Construction Regulations applies.Return to footnote

^{‡‡}Delete parts not required.

#### Average Permeability (M) of Forward End

Passenger Spaces and Crew Spaces | (a) Footnote for ^{†} Footnote for ^{‡‡} | Whole Volume of | ||||

or Other Spaces | (b) Footnote for ^{‡} | forward End | ||||

Compartment | Identification Measurements | Volume m^{3} | Longitudinal Extent | Volume m^{3} | ||

Length | Breadth | Depth | ||||

Abaft Bulkhead | ||||||

No | ||||||

(2) Total (V) = | ||||||

µ = 63+35a ÷ vFootnote for | ||||||

Footnote for ^{‡‡} = | ||||||

or 95-35 b ÷ vFootnote for | ||||||

(a) Footnote for ^{†} | ||||||

(5) Total or | Footnote for ^{‡‡} = | F.P.= (100 - µ) ÷ µ x 1.5 = | ||||

(b) Footnote for ^{‡} |

Return to footnote

^{†}Ships to which Part I of the Hull Construction Regulations applies other than ships to which Division III of Schedule I to those Regulations applies.Return to footnote

^{‡}Ships to which Division III of Schedule I to the Hull Construction Regulations applies.Return to footnote

^{‡‡}Delete parts not required.

#### Average Permeability (M) of Machinery Space

Passenger Spaces and Crew Spaces | (a) Footnote for ^{†} Footnote for ^{‡‡} | Whole Volume of | ||||

Space for Cargo, Coal or Stores | (c) Footnote for ^{‡} | Machinery Space | ||||

Compartment | Identification Measurements | Volume m^{3} | Longitudinal Extent | Volume m^{3} | ||

Length | Breadth | Depth | ||||

Between Bulkheads | ||||||

No | ||||||

(3) Total (V) = | ||||||

µ = 80 + 12.5a ÷ v | ||||||

{To be increased by 5 when ship is propelled by internal combustion engines} | ||||||

(6) Total (a) = | F.P.= (100 - µ) ÷ µ x 1.5 = | |||||

Volume (c) = |

Return to footnote

^{†}Applicable to all ships to which Part I of the Hull Construction Regulations applies.Return to footnote

^{‡}Applicable to all ships to which Division III of Schedule I to the Hull Construction Regulations applies.Return to footnote

^{‡‡}Omit parts not required

#### Volumes for Criterion Numeral

##### Permanent Oil Fuel Bunkers Before and Abaft the Machinery Space

Compartment | Volume above Inner Bottom or Line of Floors | Compartment | Volume above Inner Bottom or Line of Floors | |||

m^{3} | m^{3} | |||||

Brought Forward | ||||||

Carried Forward | (7) Total | = |

#### Summary

Whole Volume (V) | Machinery Space (M) | Passenger Spaces and Crew Spaces (P) | ||||||

After End | (1) | m^{3} | Machinery Space | (3) | m^{3} | After End | (4) | m^{3} |

Forward End | (2) | Oil Fuel Bunkers | (7) | Forward End | (5) | |||

Machinery Space | (3) | Machinery Space | (6) | |||||

Total (V) = | Total (M) = | Total (P) = |

### Ships of Class II and Class III to Which Division III of Schedule I to the Hull Construction Regulations Applies

#### Criterion Numeral (C_{S})

C_{s} to be determined in accordance with the criterion numeral formula except that | |

No. of berthed passengers x 0.056L, or 3.55, whichever is greater = | m^{3} |

P_{1} = | |

No. of unberthed passengers x 3.55 = | m^{3} |

#### Factor of Subdivision (F)

(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) |

subsection 9(1)Footnote for ^{*} |

(2) L = 131 m and upwards |

Factor from Curve A : A = 58.2 ÷ (L - 60)+ 0.18 = |

Factor from Curve BB : BB = 17.6 ÷ (L - 33)+ 0.20 = |

Required Factor : F = A - ((A - BB) (C |

paragraph 9(2)(a)Footnote for ^{*} |

(3) L = Less than 131 m and not less than 55 m (C_{s} not less than S_{1}) |

S |

paragraph 9(2)(b)Footnote for ^{*} |

When C_{s} is less than S_{1} and in all ships less than 55 m in length the subdivision is to be governed by the factor unity. |

paragraph 9(2)(b)Footnote for ^{*} |

Details of any claim for local subdivision under subsection 6(7) should be submitted with this form. |

subsection 4(4)Footnote for ^{*} |

Return to footnote

^{*}The sections referred to above are those of Schedule I to the Hull Construction Regulations.

#### Inspector’s Report

I have checked the Builders’ calculations that are required for the purpose of ascertaining the criterion numeral, factor of subdivision and permeabilities, and am satisfied that the results shown on this form are correct.

Signature of Inspector

Port

Date

## FORM B.H.2

**FLOODING CALCULATION**Dimensions, Coefficients of Form

Name of ShipBuilders and No. of Ship | ||||||||||||||

Subdivision Length (L) = m | Freeboard to Margin Line†(f) = m | Freeboard Ratio (f) ÷ (d) = | Average Permeability (µ) | |||||||||||

Subdivision Breadth(B) = m | Subdivision Draft(d) = m | After End | Machinery Space | Forward End | ||||||||||

Moulded Depth(D) = m | Sheer of Margin Line Forward† (Sf) = m | Sheer Ratio Forward (Sf) ÷ (d) = | ||||||||||||

Subdivision Depth(d+f) = m | Sheer of Margin Line Aft† (Sa) = m | |||||||||||||

Fall in Sheer (if any) = m | Criterion Numeral (B.H.2A)(Cs) = m | Sheer Ratio Aft (Sa) ÷ (d) = | ||||||||||||

Thickness of Bulkhead Deck = m | ||||||||||||||

Factor of Subdivision (F) = | ||||||||||||||

Block Coefficient | Coefficient of Mean Waterplane | |||||||||||||

*Volume of Displacement ÷ (L × B ×d) = | a | n | Centre of Flotation Forward ÷ Aft of Amidships = m | |||||||||||

= per cent of L | ||||||||||||||

Sectional Area Coefficients(ß_{1}) Area of Section to Corrected Margin Line* ÷ (B × d) | ||||||||||||||

Ordinate from After Perpendicular (per cent of L): | 0 | 10 | 15 | 20 | 30 | 40 | 45 | 50 | 60 | 70 | 80 | 85 | 90 | |

Coefficient | ||||||||||||||

* Inclusive of shaft bossing. | INSPECTOR’S REPORT | |||||||||||||

† As corrected. | I have carefully checked the Builders calculations and am satisfied that the particulars shown on this Form are correct. | |||||||||||||

Note: - For definitions, see section 2 of the Hull Construction Regulations and Divisions I and IV of Schedule I. | Signature of Inspector | |||||||||||||

SISTER SHIPS (IF ANY) | Port | |||||||||||||

Name of Ship | Builders and No. of Ship | Date | ||||||||||||

GRAPHICS NOT DISPLAYED, SEE C.R.C., C. 1431, P. 12158, 12160, 12162, 12166 to 12169; SOR/95-254, s. 29.

- SOR/78-128, s. 1
- 1987, c. 7, s. 84(F)
- SOR/95-254, ss. 27 to 29, 33
- SOR/2002-220, s. 9

- Date modified: