Perenco 49/23A Integrity Improvement Project

16th May 2016

Our client made the decision to undertake an extensive program of integrity improvement to the Inde 49/23 Alpha Platform located in the SNS South utilizing a jack up accommodation barge – Sea Fox 1.

The Inde 49/23 Alpha was installed over 40 years ago and has gone beyond its intended field life of circa 25 years, and is in need of extensive integrity remedial works.

Market forecasts suggest that a further ‘life’ of 10-15 years will be required from this Platform due to new Hydro-Carbon retrieval technology. To meet this requirement the platform structural & pipe-work integrity was to be brought up to a standard to ensure that future major works will be unnecessary, also to avoid the possibility of constraining or restricting production from the platform, due to integrity issues.

The 23 Alpha installation comprises of a three jacket single platform arrangement, located approximately off the coast of East Anglia in the SNS. The oldest part of the asset was installed in 1972 and additions in 1979 and 1980.

DSL (UK) Ltd were awarded the contract to carry out various fabric maintenance and construction related scopes on the Inde 49/23 Alpha and these will include removal of redundant equipment, steelwork and vessels, installation of new structural steel work, modifications and repairs as detailed below.

DSL completed in excess of 130,000 man hours in total without Incident on this project, over 4500 of these hours were actual On-rope hours also without incident

  • Client: Perenco UK Ltd
  • Contract completion: May 2016
  • Value: £4,700,000


Project description

The work scope involved numerous work tasks in what were challenging conditions  spanning;

  • Onshore Project Management
  • Engineering & Fabrication
  • Redundant equipment removal
  • Structural & Piping Modifications
  • Rationalisation of Utilities
  • Redundant Caisson Removal
  • E&I Support Personnel
  • Comms Tower Removal
  • Offshore Construction Services
  • Rope Access Personnel (Welders, Platers, Pipe-fitters, Riggers, E&I)

Benefits to the client

  • Multi-disciplined personnel on the asset creating efficiencies
  • Collaborative approach between Client, Construction Contractor and other project contractors
  • Open discussions between all contractors leading to innovative ideas resulting in cost and time efficiencies
  • Open sharing of Information between all parties
  • Labour sharing between contractors when work-fronts unavailable

Services provided

  • Comprehensive Survey Services
  • Project Planning and Management
  • Design, Engineering and Fabrication
  • Rope access Personnel and Equipment
  • Offshore Construction Services
  • Offshore Decommissioning Services
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