Where flammable liquids with a flash point of 60 °C or below are carried, the in- and outlet openings of venting systems are to be fitted with approved flame arresters.
Vents for the discharge of large volumes of air or gas during cargo and ballast handling operations are to be designed in accordance with the following principles:
Depending on the height of the vents, these shall allow the free flow of vapour mixtures or achieve a minimum velocity of 30 m/s.
The vapour mixtures are to be discharged vertically upwards.
The clear section of vents shall be designed in accordance with the maximum loading rate taking into account a gas evolution factor of 1.25.
