Environmental & Cleaning – Maersk FPSOs

The challenge

• Critical path scope to achieve DNV Class certification of COTs.
• Large volume of liquids and solids to be removed.
• Confined space entry, intrusive tank cleaning.
• Transfer of solids 24m vertically and 50m horizontally.
• Heavy hydrocarbon sludge consistency SG 2.
• Limitation on water use to prevent further generation of waste.
• Dispose safely NORM contaminated hazardous waste

The solution

Altrad deployed a team of five fully trained and multiskilled offshore technicians to carry out the scope of works.

• Liquids removed to the slops tank
• Solids transferred to the nominated slops tank
• Deep clean of crude oil tank (COT)
• Transference of solids 24m vertically and 50m horizontally
• Sludge transferred the liquid volume at 81m3 per hour
• Sludge removed 250m3 of hydrocarbon solids at 15 – 20 tonnes per shift
• Hydraulically driven submersible pump
• Continuous high head lift – 40m vertical lift, 81m horizontal flow

The benefits

• Reduced safety risk – reduced manual handling and confined space entry
• Closed loop system – reduces risk of environmental spills
• Capacity to pump 50% dry solids, avoiding manual handling
• Reduced persons on board (POB) thereby reducing the programme
• Reduced water consumption
• Significant reduction in cost