Case Study: Kuito FPSO Phased Decommissioning Project

Location: Offshore Angola

Sureclean was initially contracted to carry out essential tank cleaning onboard the Kuito FPSO offshore Angola, as part of a phased decommissioning project.

Sureclean Scope

The scope then extended to NORM descaling of contaminated oil process equipment, spools and pipework using water jetting techniques and tank cleaning using confined space entry.

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Technical Challenge

  • Timeline - critical path project
  • Project management, resourcing, planning and scheduling
  • Conflicting activities
  • Hazardous waste – removal of NORM, oil and hazardous chemicals
  • Working at height and confined space working


  • Hazardous environment
  • Security restrictions, ongoing visa complications
  • Complex local legislation
  • Co-ordinating and scheduling of works to meet the requirements of the overall programme

Key Facts

  • Vacuum transfer used to remove materials over 100m horizontally and 30m vertically using a typical removal rate of 8-12m³/h and a suction capacity up to 9400m³/h
  • Over 600 tonnes of crude oil and hydrocarbon sludge with a specific gravity (SG) of up to 3 removed from Cargo Oil Tanks and Topside Vessels
  • Project completed in a controlled and professional manner without safety or environmental incident
  • Commendations received from the client
  • Involved Sureclean personnel providing project management and supervision and engineers alongside local employees
  • Project duration: 8 months