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 Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter May 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Energy

Statoil Says Sees European Gas Prices Bottoming Out

Norway's Statoil does not expect European gas prices to fall much further as rising demand from the power generation sector would offset an expected increase in liquefied natural gas (LNG) supply,

Technip Bags Statoil's Umbilical Supply Contract

Technip’s wholly-owned subsidiary Technip Umbilicals Ltd.(1) has been awarded a contract by Statoil ASA to supply the umbilical(2) to the Oseberg Vestflanken 2 field offshore Norway.

Wood Group Bags Statoil MSA

Wood Group has been awarded an evergreen master services agreement (MSA) by Statoil to support the life cycles of its offshore  and onshore facilities. Work and

Salvage

Returning to the Scene of the Shipwrecks

A participant in a diving field school last fall, graduate student Tori Kiefer is back to help a new set of students learn the joy of surveying shipwrecks.   Last fall,

Grounded Bulker Repaired, Heads for Japan

The Captain of the Port for Oregon and southern Washington canceled the captain of the port order on the motor vessel Sparna allowing the vessel to leave its mooring at Kalama, Wash.

Ardent Earns ISO 9001:2015 Certification

Ardent, formed just over a year ago as a merger of A.P. Moller-Maersk’s Svitzer Salvage and Crowley’s Titan Salvage, has been issued the ISO 9001:2015 Certification

News

Guinean Sailors Arrested after Clash with Sierra Leone Navy

Sierra Leone was holding 11 Guineans including military personnel in custody on Wednesday following a confrontation at sea involving the two West African neighbours' navies,

Fleet Week Underway in New York

Parade of ships signals start of Fleet Week New York 2016   Now in its 28th year, New York Fleet Week has commenced, with ships from the U.S. Navy, U.S. Coast

Davie Begins First Resolve-Class AOR Conversion

Davie Shipbuilding has cut first steel for the Resolve Class Auxiliary Oiler Replenishment vessel.   The project consists of converting a containership into an

Offshore Energy

Technip Bags Statoil's Umbilical Supply Contract

Technip’s wholly-owned subsidiary Technip Umbilicals Ltd.(1) has been awarded a contract by Statoil ASA to supply the umbilical(2) to the Oseberg Vestflanken 2 field offshore Norway.

Damen Unveils Multi-role Utility Vessel

Work is due to start shortly on the first of a new class of Damen utility vessel UV2410.   This multi-role platform is the result of extensive consultation with

Olympic Pact with Canyon Offshore

Norwegian offshore shipping company Olympic Shipping has entered into a frame agreement with Canyon Offshore for the joint marketing and subsequent operation of

Underwater Engineering

Technip Bags Statoil's Umbilical Supply Contract

Technip’s wholly-owned subsidiary Technip Umbilicals Ltd.(1) has been awarded a contract by Statoil ASA to supply the umbilical(2) to the Oseberg Vestflanken 2 field offshore Norway.

Damen Unveils Multi-role Utility Vessel

Work is due to start shortly on the first of a new class of Damen utility vessel UV2410.   This multi-role platform is the result of extensive consultation with

Wood Group Bags Statoil MSA

Wood Group has been awarded an evergreen master services agreement (MSA) by Statoil to support the life cycles of its offshore  and onshore facilities. Work and

Subsea Salvage

Technip Bags Statoil's Umbilical Supply Contract

Technip’s wholly-owned subsidiary Technip Umbilicals Ltd.(1) has been awarded a contract by Statoil ASA to supply the umbilical(2) to the Oseberg Vestflanken 2 field offshore Norway.

Returning to the Scene of the Shipwrecks

A participant in a diving field school last fall, graduate student Tori Kiefer is back to help a new set of students learn the joy of surveying shipwrecks.   Last fall,

Aquabotix Debuts Mini Inspection Class ROV - The Endura

Aquabotix, a marine technology company delivering the accessibility of today’s electronics products to underwater ROVs, announces the immediate availability of the Endura.

 
 
Maritime Security Maritime Standards Navigation Offshore Oil Pod Propulsion Port Authority Salvage Ship Electronics Ship Repair Winch
rss | archive | history | articles | privacy | 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: 0.1116 sec (9 req/sec)