.-(1) No tank which has carried petroleum shall be repaired by welding, brazing, soldering or hot-riveting unless it has been examined by a competent responsible person and certified in writing by such person to be free from inflammable vapours or oil.(2)The certificate issued by the competent and responsible person under sub-rule (1) shall be preserved by the repairer for a period of at least three months and shall be produced for examination on demand by an Inspector.(3)All repairs to tanks which have contained petroleum shall be carried out by qualified and experienced persons.(4)All the compartments of the tank shall be tested after each repair in the manner laid down in para 5 of the Third Schedule.
