Seaflex Aids Underwater FPSO Mooring Retrieval

Posted by Eric Haun
Wednesday, January 29, 2014
Photo: Unique Seaflex

Unique Seaflex, a Unique Maritime Group company which is an integrated turnkey subsea and offshore solution providers, has facilitated a complex underwater lift project carried out for Lundin Tunisia BV in approximately 300m of water.

Lundin Tunisia BV is a 40% stakeholder in and operator of the Oudna field 80km offshore Tunisia.

Abandoned by Shell in the mid-80s when relatively small discoveries in relatively deep water were still considered unviable due to lack of pipeline infrastructure, with the advent of the FPSO came a new way to make such fields viable.  Oudna was accordingly de-mothballed a decade or so ago, and serviced until recently by the FPSO Ikdam.

At end of the field’s viable lifecycle, the problem arose of how best to decommission the FPSO - and in particular how to take care of the delicate operation of disconnecting several hundred tons’ worth of moorings without incident.

After a series of technical discussions between Lundin and Unique Seaflex, it was determined that a combination of 41 different-sized parachute-style Air Lift Bags (ALBs) up to 50t in size were needed to be installed on the moorings to reduce their tension to a manageable level.  The deck-mounted linear winch was rated to 450t, but because the three mooring anchors were extremely well embedded in the sandy seabed, the effective tension on the chafe chain would have increased by an estimated 1.5 to 2 times the original 400t. 

The use of Unique Seaflex ALBs allowed the deck-mounted linear winch to pull on the chafe chain so as to slacken the connection to the Ikdam deck hook.  The connecting shaft was then pulled out from the wren hook and by doing so, freed the chafe chain thus allowing the mooring system to gently be lowered on a wire, thereby de-tensioning the system.Once released, the chafe chain was transferred to a nearby AHTV which held the de-tensioned mooring system whilst the Ikdam FPSO disconnected.

Along with the fleet of ALBs, Unique Seaflex also supplied all the heavy duty shackles and lifting slings as well as an air inflation/deflation system and a topside technician to oversee the operation and ensure the safest and most efficient use of the package of equipment.

Commenting on this occasion, Graham Brading, Managing Director at Unique Seaflexwho was instrumental in leading the Unique Seaflex effort on this project proudly said, “Whilst we do supply standard buoyancy products to solve standard buoyancy problems, Unique Seaflex is always dedicated to bring out world-class solutions when clients describe their operational challenges and ask us to work with them to develop methods which will deliver them the best possible technical, operational and commercial outcome.”

seaflex.co.uk
 

  • Photo: Unique Seaflex

    Photo: Unique Seaflex

Maritime Reporter March 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Energy

World's Largest Ship: Pioneering Spirit Awaits Completion

Final construction aboard the world’s largest vessel, Pioneering Spirit (formerly named Pieter Schelte), is wrapping up in the Port of Rotterdam before the vessel

U.S. Submits Formal Plan for Paris Climate Talks

The United States on Tuesday formally submitted its climate change strategy to the United Nations, outlining domestic measures it is taking to achieve up to a 28

India Halts Iran oil Imports Under U.S. Pressure

Oil imports from Iran at 220,000 bpd in year to March 31. U.S. pressured India not to raise annual Iran oil imports. India halted oil imports from Iran for the

News

U.S. DoI Upholds 2008 Shell Arctic Lease

The U.S. Interior Department on Tuesday upheld a 2008 lease sale in the Chukchi Sea off Alaska, moving Royal Dutch Shell a step closer to returning to oil and gas

All American Marine Delivers Ferry to Seattle

All American Marine, Inc. (AAM) today announced the delivery of a new passenger ferry that will serve the city of Seattle.    The vessel, MV Sally Fox, was dedicated

HEADHUNTER Marine Sewage Treatment Systems

Headhunter’s team of engineers, fabricators, and wastewater specialists work together to provide innovative and efficient sewage treatment solutions.   Offering systems in three categories; STP,

Offshore Energy

U.S. DoI Upholds 2008 Shell Arctic Lease

The U.S. Interior Department on Tuesday upheld a 2008 lease sale in the Chukchi Sea off Alaska, moving Royal Dutch Shell a step closer to returning to oil and gas

Japan, U.S. Look to Expand Naval Cooperation

Japanese Prime Minister Shinzo Abe's push to allow Tokyo to come to the aid of an ally under attack will pave the way for closer cooperation between U.S. and Japanese forces across Asia, a top U.

BP Terminates GoM Rig Contracts

BP terminated contracts for two deepwater oil drilling rigs in the Gulf of Mexico as the British oil company slashes its exploration budget due to fallen oil prices.

Underwater Engineering

Keppel FELS Delivers 11th Jackup to Mexico

Keppel FELS Limited (Keppel FELS), a wholly owned subsidiary of Keppel Offshore & Marine Ltd (Keppel O&M), has delivered a KFELS B Class jackup rig to Mexican national oil company,

US Navy to Roll out Underwater Spy Satellites

The robotic series that remade crusade in skies will shortly extend to a low sea, with underwater view “satellites,” drone-launching pods on a sea building and unmanned ships sport submarines,

Statoil: Polarled Pipe-Laying Kicks Off

On 26 March, the Solitaire pipe-laying vessel started on the first stage of the Polarled installation project. The 482-kilometre long pipeline will transport gas

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Navigation Pipelines Port Authority Salvage Ship Repair Ship Simulators Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1717 sec (6 req/sec)