Dyneema: Making Light Work of Ultra-Deep Sea Recovery Operation

Tuesday, August 16, 2011
Dyneema Salvage Operation

A salvage operation on a ship wreck 3200 meters below the surface of the South Atlantic has been successfully carried out thanks to the use of lightweight ropes made with Dyneema ultra-high molecular weight polyethylene fiber.

Dyneema fiber, the world’s strongest fiber, is manufactured by DSM Dyneema. It is used by Hampidjan, one of the largest fishing gear and “super rope” manufacturers in the world, to make Dynex Warp, an advanced patent-pending winch line for deep sea lifting and lowering as well as for towing fishing trawls. The Dynex Warp rope was used over several months on the MV Seabed Worker in a salvage operation to rescue valuable cargo from a sunken ship.


The depth of the wreck meant that use of steel rope would have been virtually impossible, since it would have had a weight in the water of over 35 tonnes. By contrast, the Dynex Warp rope containing Dyneema fiber weighed a mere 740 kg, thanks to its relative density of 1.1. (Out of the water, 4.2 km of the Dynex Warp rope weighs 6.5 tonnes, against around 50 tonnes for the same length of steel rope with the same strength).

This reduced weight affects not only the lifting operation but also the stability of the vessel and its deck load capacity. In fact, the MV Seabed Worker holds a 6000-meter long Dynex Warp rope for future operations, without needing to switch to a larger winch which would require a larger and thus more expensive vessel.

 

The ship is operated by the Norwegian Seabed Group, a long-established company equipped with ultra-modern equipment for deep-sea operations including wreck salvage. Seabed says that over the several months it has been using the Dynex Warp rope for the current operation, on a standard drum winch with an electronically controlled spooling system, it has experienced no problems at all with the spooling, even though the rope has a high number of layers on the drum.

The version of Dynex Warp used in this operation is a 12-strand braided rope with a diameter of 46 mm. It has the same strength as a steel rope with the same diameter. Even pulling up heavy loads from over 3 km below, it shows very little elongation. The rope consists of six different layers that together provide very high cross-sectional stability and axial stiffness. In addition to their extreme strength-to-weight ratio, ropes containing Dyneema fiber are also very durable, with excellent resistance to abrasion and also to weathering. They require very little maintenance, and so help reduce operating costs and increase safety.

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

People & Company News

QinetiQ Signs Contract with ASV

QinetiQ, as part of a new Marine Surface Target Service, has signed a contract with Autonomous Surface Vehicles (ASV) for the supply and operational support of autonomous surface target vessels.

GTT Wins DSME Order for 9 More Icebreaking LNGCs

Gaztransport & Technigaz (GTT), a designer of membrane containment systems for the maritime transportation and storage of Liquefied Natural Gas (LNG), announced

Bollinger to Build 6 More FRCs for the USCG

Bollinger Shipyards, Inc., Lockport, Louisiana, announced the award of six additional USCG Sentinel Class Fast Response Cutters (FRCs). The U. S. Coast Guard

Offshore

New Crewboat Design for Offshore O&G Market

Upgraded crewboat design employs carbon-reinforced composite materials and is lighter, faster and more fuel-efficient than alternatives. Marine Oil Transportation

2,545 Candidates Vie for 11 Positions at Maersk Drilling

Maersk Drilling reported 2,545 applicants for the 11 MITAS engineer positions available within the company in 2014. The Maersk International Technology and Science Program,

GDI Awards N-KOM US$110-M Contracts

Gulf Drilling International (GDI) Limited, a subsidiary of Gulf International Services (GIS), the largest oilfield service company in Qatar, has awarded two contracts

Salvage

Concordia Tow Update: Smooth Sailing

The Costa Concordia wreck removal team reported this morning at 10:30 a.m. that after 22 hours of navigation, the convoy was over 50 miles off Giglio Island with about 140 miles from Genoa Prà-Voltri.

Legislation Grants Funding for EU's EMSA

EU Council Adopts Regulation on EMSA Funding The European Union Council adopted a regulation yesterday to finance the actions of the European Maritime Safety

Concordia Expected to Reach Genoa Saturday

The Crowley Maritime Corp. subsidiary TITAN Salvage and partner Micoperi have confirmed that the Costa Concordia – the Concordia class cruise ship that wrecked along shores of Giglio Island,

Marine Equipment

QinetiQ Signs Contract with ASV

QinetiQ, as part of a new Marine Surface Target Service, has signed a contract with Autonomous Surface Vehicles (ASV) for the supply and operational support of autonomous surface target vessels.

Volvo Penta Diesel Sterndrives for Metal Shark Patrol Boats

Metal Shark now offers Volvo Penta diesel sterndrives in its 29 Defiant patrol boats for customers requiring optimum performance, durability and maneuverability.

More VDR Orders for Danelec in China

Danelec Marine has received orders to supply Voyage Data Recorders (VDRs) and Electronic Chart Display and Information Systems (ECDIS) for 18 offshore support vessels in China.

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Pipelines Salvage Ship Electronics Ship Simulators
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: 0.2364 sec (4 req/sec)