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

Application of Part

• 101 (1) Subject to this section, this Part applies to a ship that is a steamship of more than five tons gross tonnage, built or converted for the purpose of towing, but does not apply to such a ship that, when used for towing, is used only for salvaging logs.

• (2) Sections 115 to 132, 138 to 141 and 143 do not apply to an existing ship until

  • (a) in the case of a ship for which on April 1, 1972 there is a certificate in force, the first day on which the certificate is due for renewal; or

  • (b) in the case of a ship for which on April 1, 1972 there is no certificate in force, April 1, 1972.

• (3) Where an existing ship requires modification to comply with any of sections 115 to 132, 138 to 141 or 143, the modification work shall

  • (a) begin on or before the date on which those sections come into force with respect to the ship;

  • (b) if not completed at the time those sections come into force with respect to the ship, be resumed at intervals, not exceeding one year, that are satisfactory to a steamship inspector; and

  • (c) be completed by April 1, 1976.

• (4) Where the modification work referred to in subsection (3) does not begin on or before the date required by that subsection or where at any time after that date the proportion of that work completed is less than a proportion that is satisfactory to a steamship inspector, the ship shall not be used for towing until the proportion of that work completed is a proportion that is satisfactory to a steamship inspector.

102 Where an existing ship is modified and the modification work begins on or after October 1, 1971 and if, in the opinion of the Board, it is reasonable and practicable for the ship to comply with all of this Part, the Board may declare the ship to be a new ship.

Equivalents

103 Upon consideration of the class of voyage and type of operation on which an existing ship is engaged, the Board may, if it is satisfied that the standard of safety required by this Part is not lowered thereby, accept any constructional arrangement on that ship as complying with these Regulations.

Stability

104 Every new ship with openings in the main deck aft of the engine room that are capable of causing down flooding shall be designed and constructed so that, in any operating condition, positive buoyancy and stability are retained and no part of the main deck is submerged when any one watertight compartment aft of the engine room is flooded.

105 Subject to section 107, no ship shall be used for towing until its stability characteristics have been approved by the Board.

• 106 (1) Subject to section 107, the owner of a ship shall

  • (a) arrange for an inclining experiment to be conducted on the ship in the presence of and to the satisfaction of a steamship inspector;

  • (b) submit to the Board in respect of the ship the following basic stability data:

    • (i) hydrostatic curves,

    • (ii) cross curves of stability,

    • (iii) a capacity plan showing the capacities of all tanks and cargo spaces and the related vertical and longitudinal centres of gravity,

    • (iv) tank sounding tables,

    • (v) draught mark locations, and

    • (vi) the results of the inclining experiment referred to in paragraph (a); and

  • (c) submit to the Board, in respect of the ship, the developed stability data computed for each of the following conditions:

    • (i) light ship condition,

    • (ii) departure from port with 100 per cent fuel, fresh water and stores,

    • (iii) worst intact stability condition, and

    • (iv) arrival in port with 10 per cent fuel, fresh water and stores.

• (2) The results of the experiment referred to in paragraph (1)(a) shall be taken into account when computing

  • (a) the developed stability data referred to in paragraph (c) of that subsection; and

  • (b) the stability data referred to in subsection 108(1) in the case of a new ship.

• (3) The free surface effect of liquid in tanks shall be taken into account when computing a righting lever curve or a metacentric height for the purposes of

  • (a) the developed stability data referred to in paragraph (1)(c); and

  • (b) the flooded conditions referred to in paragraphs 108(1)(b) and (c).

• (4) Every righting lever curve shall show the angle at which the edge of the main deck submerges.

• (5) Subject to the approval of the Board,

  • (a) the immersed volume of any structure provided with weathertight closing appliances, or

  • (b) the immersed volume of any structure up to the level of the bottom of the lowest exterior opening not closed by a weathertight closing appliance,

  may be taken into account when computing a righting lever curve.

• (6) The owner of a ship shall provide on the ship, for the use of the master, stability information in respect of the ship in the form of a booklet approved by the Board.

• (7) The Board may, on application by the owner of a ship, dispense with the inclining experiment referred to in paragraph (1)(a) in respect of the ship if the stability characteristics of a sister ship have been approved as required by section 105.

• 107 (1) Sections 105 and 106 do not apply to an existing ship unless

  • (a) the main propelling machinery of the ship is changed for machinery developing greater brake power;

  • (b) the main propelling machinery of the ship is changed and the difference in weight between the new and the old installation is, in the opinion of the Board, sufficient to adversely affect the stability of the ship; or

  • (c) the ship is modified to such an extent that, in the opinion of the Board, its stability is adversely affected.

• (2) Where the Board is of the opinion that modifications made to a ship adversely affect its stability within the meaning of paragraph (1)(c), the owner of that ship shall submit such of the stability data described in section 106 as the Board may request.

• 108 (1) In the case of a new ship, the owner shall, subject to subsection (2), submit to the Board in respect of the ship the following stability data:

  • (a) the forward and aft draughts when the watertight compartment aft of the engine room that would cause the greatest reduction in freeboard is completely flooded;

  • (b) the metacentric height when the watertight compartment aft of the engine room that would cause the greatest reduction in the metacentric height is completely flooded; and

  • (c) the metacentric height when the watertight compartment aft of the engine room that would cause the greatest reduction in the metacentric height in a partly flooded condition is flooded to that condition.

• (2) Subsections 106(2) to (5) apply when computing the stability data referred to in subsection (1).

Subdivision of the Hull

• 109 (1) In the case of a new ship, the ship shall be fitted with

  • (a) a collision bulkhead in an approved location; and

  • (b) a watertight bulkhead at the forward end and at the aft end of the main propelling machinery placed as close together as is practicable.

• (2) Where the forward bulkhead of the engine room of any ship is fitted in an approved location, it may be approved as the collision bulkhead.

• (3) Where, in the opinion of the Board, it is reasonable and practicable, every new ship that is propelled by steam engines shall be fitted with a watertight bulkhead between the boilers and the main engines.

Openings in Watertight Bulkheads

110 In the case of a new ship, where an access opening is fitted in the watertight boundary bulkhead of a watertight compartment referred to in section 104 or in any bulkhead referred to in section 109, the access opening shall, unless it is a tank manhole, be

• (a) made as small as practicable;

• (b) placed as near to the top of the bulkhead as is practicable, except in the case of an access opening between machinery spaces or to a shaft tunnel;

• (c) reinforced so that the strength of the bulkhead is not reduced by the opening; and

• (d) fitted with a watertight closing appliance that conforms to the requirements of section 111.

111 The watertight closing appliance required by paragraph 110(d) shall

• (a) be an approved watertight closing appliance;

• (b) in combination with the reinforcing of the opening, be at least as strong as the unpierced bulkhead;

• (c) be capable of being opened and closed watertight from each side of the bulkhead and, in the case of a ship of 24.1 m in length or over, capable of being closed watertight from a position above the main deck; and

• (d) be provided with a position indicator light in the wheelhouse that is

  • (i) actuated by the closing appliance,

  • (ii) lighted when the closing appliance is open,

  • (iii) serviced by a standby circuit and lamp that are automatically brought into operation when the normal circuit or lamp fails, and

  • (iv) visible by the helmsman at the main steering position.

112 The collision bulkhead of a ship of 15 tons, gross tonnage, or less may be fitted with a drain cock that

• (a) has a straight through bore of not more than 38 mm in diameter;

• (b) is self-closing;

• (c) is attached directly to the collision bulkhead; and

• (d) drains directly into the bilge without the addition of any piping.

113 Every closing appliance fitted in a watertight boundary bulkhead of a watertight compartment referred to in section 104 or in any bulkhead referred to in section 109 shall

• (a) when the ship is underway except when the appliance is in use, be kept closed and fully secured;

• (b) unless it is a tank manhole closure, be provided with a notice on each side of the appliance stating that the appliance is to be kept closed and fully secured when the ship is underway except when the appliance is in use; and

• (c) be provided with a notice, adjacent to the position indicator light in the wheelhouse, stating that every closing appliance fitted in a watertight boundary bulkhead of a watertight compartment referred to in section 104 or in any bulkhead referred to in section 109 shall be kept closed and fully secured when the ship is underway except when the appliance is in use.

Crew Access Openings

• 114 (1) In the case of a new ship of 13.7 m in length or over, every crew access opening that gives direct access to a space below the main deck shall be an interior opening.

• (2) Notwithstanding subsection (1), a crew access opening provided for emergency escape or any other crew access opening not used in the usual daily routine of the ship may be an exterior opening.

• 115 (1) Subject to subsection (3), every space usually occupied by crew when a ship is under way,

  • (a) in the case of a compartment below the main deck of the ship shall be provided with two crew access openings, or

  • (b) in the case of a structure on or above the main deck where the ship is a new ship, shall be provided with two exterior crew access openings,

  and to both of such crew access openings there shall be ready access from anywhere inside the compartment or structure.

• (2) The openings referred to in subsection (1) shall be so located that

  • (a) a single incident occurring inside or outside the compartment or structure, or

  • (b) a list to either side of the ship

  will not prevent the use of both openings at the same time.

• (3) Where the provision of two exterior crew access openings for a structure on or above the main deck of a new ship is impracticable because of the structure’s small size, the structure may, subject to approval, be provided with a single exterior crew access opening.