.-(1) No person shall cause to be repaired or repair by the use of hot work any tank or container which had petroleum unless it has been thoroughly cleaned and freed from petroleum and petroleum vapour or otherwise prepared for safely carrying out such hot repair and certified, in writing, by a competent person to have been so repaired.(2)The certificate required under sub-rule (1) shall be preserved by the repairer for a period of at least three months and produced to an inspector on demand.
