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 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Salvage

Stranded Virginia Beach Bulker Salvage Plan Set

The Coast Guard advises it is in the final stages of reviewing a salvage plan that is scheduled to begin Friday morning to move the 751-foot bulk carrier, 'Ornak',

Obama Offers US Aid to S.Korea Following Ferry Accident

U.S. President Barack Obama on Thursday expressed condolences to the families of the victims of the South Korean ferry sinking and said the U.S. military will provide

USCG Responds to Vessel Fire

The U.S. Coast Guard (USCG) reported it is responding to a report of a vessel that caught fire and became disabled with two men and a dog aboard south of the McCormick

News

Saudi SABIC Q1 Profit Falls 1.8 % On Product Prices

Profit at Saudi Basic Industries Corp (SABIC), one of the world's biggest petrochemical firms, slipped 1.8 percent in the first quarter of this year as lower

Korean Ferry Captain's Detention Could Extend As Death Toll Mounts

South Korean prosecutors investigating a ferry disaster said on Sunday they would seek to extend the detention of the ship's captain and two other crew by 10

First Bodies Recoved From Sunken Ferry

South Korean divers retrieved three bodies from inside a sunken ferry overnight, officials said on Sunday, the first time they have been able to gain entry to the passenger section of the ship.

Offshore Energy

Shell Commited To Russia Expansion Despite Sanctions

Royal Dutch Shell is committed to expansion in Russia, Chief Executive Ben van Beurden told Russian President Vladimir Putin at a meeting on Friday amid sanctions

Russia Ships First Oil From Offshore Arctic Platform

President Vladimir Putin hailed Russia's first shipment of Arctic offshore oil on Friday, saying the platform decried by environmentalists will help Moscow expand its global energy markets share.

Years After BP U.S.Oil Spill: Compensation Battle Rages

Four years after the Deepwater Horizon spill, oil is still washing up on the long sandy beaches of Grand Isle, Louisiana, and some islanders are fed up with hearing from BP that the crisis is over.

Underwater Engineering

Ultra-deepwater Drillship 'Maersk Valiant' Delivered

Maersk Drilling advises that its second new drillship, 'Maersk Valiant', has been delivered from the Samsung Heavy Industries (SHI) shipyard in Geoje-Si, South-Korea.

BOEM gives more time to submit plans OCS

The Bureau of Ocean Energy Management (BOEM) announced today the publication of its Final Rule to extend time requirements for submitting a Site Assessment Plan

Three European firms win Angola deepwater deals

Three European companies have won contracts for almost half the value of Angola's $16 billion ultra-deepwater Kaombo oil project, confirming a trend toward bigger

Subsea Salvage

When Will Deep Sea Mining Commence? The Robot is Ready

The world's first deep sea mining robot sits idle on a British factory floor, waiting to claw up high grade copper and gold from the seabed off Papua New Guinea

KVH Precision Sensors for Geodetics' Inertial Navigation Systems

KVH Industries entered into a strategic partnership with Geodetics Inc., a leader in the development of real-time, high-precision position and navigation solutions.

Wreck-Removal Convention to Enter into Force

Shipowner liability on the horizon as Denmark ratifies international instrument The Nairobi International Convention on the Removal Wrecks will enter into force on April 14,

 
 
Maritime Careers / Shipboard Positions Maritime Standards Navigation Offshore Oil Pipelines Salvage Ship Repair Shipbuilding / Vessel Construction Sonar 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: 0.1174 sec (9 req/sec)