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

189. (1) Subject to subsection (2), every ventilation inlet and outlet in a superstructure or deckhouse or leading to or from a machinery space shall be located as far aft as is practicable.

(2) Where a ship is designed to load or discharge cargo at the stern, every ventilation inlet and outlet of the ship referred to in subsection (1) shall be located in a place satisfactory to the Board.

190. (1) Every cargo pump room shall be fitted with a suction type mechanical ventilation system that

• (a) has a capacity sufficient to provide at least 20 air changes per hour based on the gross volume of the space of the room and sufficient to minimize the possibility of flammable vapours accumulating in the room;

• (b) is arranged so as to effectively ventilate the complete space of the room and to permit extraction of air from the vicinity of the pump room bilges immediately above the transverse floor plates or bottom longitudinals;

• (c) has an emergency intake that is

  • (i) placed in the ventilation ducting at a height of approximately 2 m above the lower platform of the room, and

  • (ii) fitted with a fire damper that is capable of being opened and closed from the weather deck or the lower platform of the room;

• (d) provides a means of ensuring a free flow of gases through the lower platform of the room to the ventilation ducting intakes; and

• (e) is constructed and arranged so as to prevent the risk of sparks.

(2) The air, gases and vapours extracted from the cargo pump room by the ventilation system referred to in subsection (1) shall be discharged from the system at a safe place on an open deck.

191. (1) Any opening in the cargo tank deck from which gas emission can occur shall be arranged and positioned in a manner that minimizes the possibility of

• (a) gas being collected in the vicinity of deck machinery and equipment that may constitute an ignition hazard; and

• (b) gas being admitted into enclosed spaces that contain a source of ignition.

(2) For the purposes of subsection (1), the height of the opening above the deck and the discharge velocity of the gas shall be determined having regard to the distance of any outlet from any deckhouse opening or source of ignition.

192. (1) Pipes that penetrate ‘A’ Class divisions or ‘B’ Class divisions and pipes through which combustible liquids flow shall be made of steel or an equivalent material.

(2) Pipes that are used for overboard discharges or sanitary discharges and outlets that are close to the waterline shall be made of materials that are not readily rendered ineffective by heat and that will not give rise to the danger of flooding upon failure of the pipe or outlet in the event of fire.