Ventilation of pump rooms and other enclosed spaces
(1) (a) Cargo pump rooms and pump rooms having a similar hazard shall be mechanically ventilated and discharges from the exhaust fans shall be led to a safe place on the open deck.
(b) The ventilation of these rooms shall have sufficient capacity to minimize the possibility of accumulation of flammable vapours.
(c) The number of changes of air shall be at least 20 per hour, based upon the gross volume of the space.
(d) The air ducts shall be arranged so that all of the space is effectively ventilated.
(e) The ventilation system shall be of the exhaust type, using fans of the non-sparking type.
(2) Ventilation inlets and outlets and other deckhouse and superstructure boundary space openings shall be located clear of the cargo pump room openings and openings for machinery space ventilation shall be located as far aft as practicable taking into consideration the location of any stern loading and discharging facilities provided.
Additional requirements for tankers constructed on or after 1 September 1984
(3) (a) The cargo spaces and their adjacent enclosed spaces in combination carriers shall be capable of being ventilated by permanently installed or portable fans.
(b) A fixed gas detection system shall be provided in cargo pump rooms, pipe ducts and the cofferdams adjacent to slop tanks.
(c) Arrangements shall be provided to detect the presence of flammable vapours in all other spaces within the cargo tank area from the open deck or other easily accessible positions.
Additional requirements for tankers constructed on or after 1 July 2002