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 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Aberdeen Pupils Peek into Subsea Oil & Gas Technology

Pupils at an Aberdeen primary school were given a rare insight into the depths of the oil and gas industry’s subsea sector after getting to sit in the driving

AVEVA, DNV GL's Sesam Integration Cuts Cost

Integration of Aveva and DNV GL's Sesam Reduces Costs in Maritime and Offshore Engineering. Engineers designing ship hulls and offshore floaters can now save

FORAN for Pertamina's Future Ships

FORAN has been chosen by state-owned company PERTAMINA to review the design of their future oil product carrier ships, under construction in a shipyard with the FORAN System.

Offshore

Aberdeen Pupils Peek into Subsea Oil & Gas Technology

Pupils at an Aberdeen primary school were given a rare insight into the depths of the oil and gas industry’s subsea sector after getting to sit in the driving

Technip Samsung JV Wins 2 FLNG Project Contracts

The Browse project covers the realization and installation of three FLNG units to develop the Brecknock, Calliance and Torosa fields in the Browse Basin, 425 kilometers North of Broome,

Fjords Processing Bags Johan Sverdrup Contracts

Fjords Processing, headquartered in Norway (Fornebu), has won three contracts for the deliveries of process systems for the Johan Sverdrup development in the North Sea.

Salvage

Passenger Ferry Capsizes in the Philippines, Nearly 40 Dead

MBCA Kim Nirvana, a passenger boat carrying 189 people has capsized in the central Philippines, minutes after leaving port, the Philippine Red Cross and coast guard spokesman Cmdr.

New Imagery Allows Viewers to ‘Tour’ WWII Shipwrecks

High-tech underwater cameras help uncovering the secrets of HMAS Sydney   A recent expedition to survey historic World War II shipwrecks has produced a wealth

Philippine Ferry Sinks, 36 Dead

A ferry carrying 189 passengers and crew capsized off the central Philippines in heavy waves on Thursday, killing at least 36 people but the majority of those on board were rescued,

Marine Equipment

FORAN for Pertamina's Future Ships

FORAN has been chosen by state-owned company PERTAMINA to review the design of their future oil product carrier ships, under construction in a shipyard with the FORAN System.

Bestobell Bags HHI's Valve Order

Bestobell Marine, a world leading supplier of cryogenic valves for ships, has won a major new order from Hyundai Heavy Industries (HHI) in South Korea to supply valves for two new vessels.

CNOOC Acquires Asia's 1st LNG Powered Tug

China National Offshore Oil Corporation (CNOOC) has taken delivery of Asia’s first tugboat Hai Yang Shi You 525, designed to operate solely on liquefied natural gas as ship’s fuel.

 
 
Maritime Careers / Shipboard Positions Maritime Security Navigation Offshore Oil Pod Propulsion Port Authority Salvage Ship Electronics 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: 0.2634 sec (4 req/sec)