.-On steam or motor vessels not specially constructed for the carriage of petroleum-(a)any petroleum shall either be carried in separate compartments which shall be gas-tight and shall be effectively sealed, or in a hold in which there are efficient ventilators in accordance with sub-rule (2) of rule 54 or on deck in accordance with rule 60;(b)petroleum Class A shall be packed in containers complying with the provisions of rules 4 and 5;(c)special precautions shall be taken against smoking and the use of lights or fire of any kind while cargo is being loaded or unloaded or while the hatches are off, or any deck openings are uncovered, before any lights are used in compartment which contains petroleum. Precautions shall also be taken to ensure that the space is clear of vapour and all empty containers which have contained petroleum Class A are kept securely closed.
