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


Energy

Are We on the Crest of an Offshore Wind Wave?

This time last year, when we were preparing to host ABN AMRO’s inaugural international seminar on offshore wind the imminent Borssele offshore wind tender in the Netherlands was a hot topic.

US Oil Output Seen on the Rise

Large U.S. shale oil companies, flush with cash raised through stock offerings, are gobbling up properties in the Permian Basin straddling Texas and New Mexico, a trend that could boost U.

Global Maritime Completes Njord A Disconnection and Tow to Shore

Global Maritime Consultancy & Engineering, a provider of marine warranty, dynamic positioning and engineering services to the offshore sector, has successfully

News

VLCC Delivered to Gener8 Maritime

Gener8 Maritime, Inc., a U.S.-based provider of international seaborne crude oil transportation services, announced that it has taken delivery of the ECO VLCC the Gener8 Macedon on August 30,

Grand Bahama Shipyard Expands Sales Team

Grand Bahama Shipyard Limited (GBSL) has added three regional sales directors to its Marketing and Sales Division, with posts in the Americas, Europe and Asia/Middle East.

NYC Ferry Strikes a Group of Kayakers

A New York Waterways ferry struck a group of kayakers on the Hudson River Tuesday afternoon, according to the U.S. Coast Guard.   Five of the 11 kayakers were

Offshore Energy

Are We on the Crest of an Offshore Wind Wave?

This time last year, when we were preparing to host ABN AMRO’s inaugural international seminar on offshore wind the imminent Borssele offshore wind tender in the Netherlands was a hot topic.

Brazil May Open Petrobras Subsalt Area to Other Companies

Brazil may allow companies besides Petrobras to bid for the right to produce extra oil from areas it sold to the state-led oil company in 2010, the head of the

Arctic Sea Ice Melt Continues

As of August 14, Arctic sea ice extent is tracking third lowest in the satellite record, according to the National Snow & Ice Data Center (NSIDC). The southern

Subsea Salvage

Esvagt Makes Vestdavit MissionEase First Choice for Mission Bay

Norway-based boat system and davit-handling specialist Vestdavit has secured a breakthrough order for its unique MissionEase multi-boat handling solution for mission bays,

Researchers to Visit ‘Battle of the Atlantic’ Wreckage

Researchers from the U.S. National Oceanic and Atmospheric Administration (NOAA) and its partners are set to visit what remains of two ships—a German U-boat and

Submarine Found in North Sea

The Danish Maritime Authority confirms having received a report on the finding of a wreck off the west coast of Jutland. The report also states that there are

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Navigation Pipelines Pod Propulsion Salvage Ship Repair Shipbuilding / Vessel Construction 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: 0.1107 sec (9 req/sec)