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

News

HCI Capital Renamed Ernst Russ AG

A vote was passed at the ordinary shareholders’ meeting of HCI Capital AG yesterday to change the company’s name to Ernst Russ AG. The Executive Board and Supervisory

ABP orders Two Gottwald cranes

Terex Port Solutions (TPS) has received an order from Associated British Ports (ABP) for two electric Terex Gottwald Model 8 portal harbour cranes in the G HSK 8424 B four-rope grab variant.

Traffic Separation Schemes off Western Australia

On 1 December 2016 two new Traffic Separation Schemes (TSS) will come into effect off the south-west coast of Western Australia. Australia’s proposal to establish

Offshore Energy

POSH Bags Shell FLNG Contract

Singapore’s offshore marine services provider PACC Offshore Services Holdings Ltd. (POSH) has been awarded a contract to support Shell’s Prelude floating liquefied

US Oil Drillers Cut Rigs after 3 Weeks of Additions

U.S. oil drillers cut rigs this week for a 20th week this year after three weeks of additions, according to a closely followed report on Friday, as crude prices

Ulstein Delivers for BS Offshore

The first of two service operation vessels (SOV) ordered in 2015 by Bernhard Schulte Offshore (BS Offshore) and its client Siemens from Ulstein Verft in is now completed,

Underwater Engineering

UK First to Accept Marine Geoengineering Amendments

The United Kingdom has become the first State to formally accept the 2013 marine geoengineering amendments to the 1996 “London Protocol”, the treaty covering dumping of wastes at sea.

Orca Energy ESS to Power Fish Farm Support Vessel

Grovfjord Mek. Verksted AS (GMV) has selected Corvus Energy as the supplier of the lithium ion based energy storage system (ESS) for a fish farm support vessel called GMV ZERO.

Viscometer Helps Coating Process

Oxfordshire based Chiltern Connections specialist is a provider of conformal coating machines and associated solutions for a wide range of industrial customers.

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Pipelines Pod Propulsion Port Authority Ship Electronics Ship Simulators 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: 0.1084 sec (9 req/sec)