63. Conditions relating to lids, etc. during pumping operations
(1) The Master of an oil vessel must ensure that while pumping is in progress the lids, screw caps, or other removable coverings of the tanks must be kept securely fastened or screwed down, except so far as may be necessary to enable discharge of flammable liquid to proceed, and where it is necessary to remove any lid, screw cap, or other coverings, safety wire gauzes must immediately be properly fitted, or other effective measures immediately taken, by the Master to prevent the ignition of the flammable liquid or vapours.
(2) If any leakage occurs while flammable liquid is being loaded onto or discharged from an oil vessel, the Master of the oil vessel must forthwith cause the loading or discharging to cease.
(3) A Master of an oil vessel who contravenes this by-law commits an offence.