.-The following provisions shall apply for the transport of petroleum other than petroleum Class C in ships or other vessels, namely:-(a)all tanks shall be fitted with independent approved filling and suction pipes and valves, or with stand pipes with blank flanges, all pipes being carried down nearly to the bottom of the tanks, and no petroleum in bulk shall be taken on board or discharged except through such pipes and valves, unless otherwise permitted by the Chief Controller in writing;(b)all tanks shall be fitted with manholes having screw-down cover with petroleum-tight joints and, in the case of tanks intended for use with petroleum Class A, with ventilators or relief valves of approved pattern properly protected with wire gauge of a mesh not less than 11 meshes to linear centimetre; and(c)ventilators similarly protected shall be fitted to all spaces, around tanks.
