Overview Removal of approximately 90 tonnes of sludge from a draining tank using vacuum transfer technology whilst the rig was moored in a local shipyard. Harpers Environmental scope of works Provide manpower and equipment for the removal and disposal of more than 90 tonnes of oily sludge from the No9 tank on board the drilling rig by means of vacuum transfer application, then clean the tanks to a standard ready for inspection. Technical Challenge The tank was located at the bottom of the hull and was designed with a double bottom comprising of eight compartments, the dimensions of which were approximately one metre in height and 20 metres in length. Restrictions / Considerations Hazardous Environment – Conned Space Entry Working, access and egress. Design / Layout of Tank Waste containme

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