This case study demonstrates the qualities of Dyneema® rope.
Off the coast of Zeebruggem, Belgium a 60 strong wind farm is being built. It is an enormous and demanding project. The lead contractor is DEME (Dredging, Environmental and Marine Engineering). Here are just some of the facts:
- Each wind tower will be 120 metres high
- Each concrete foundation will be 2800 tons each
- The foundations will be on the seabed at roughly 25 metres underwater
- Initial rope requirement 4 x 500 metres
A critical part of the project plan is the positioning and securing of barge vessels used to handle all the equipment, including the crucial lifting cranes. Dredging International chose mooring ropes made with Dyneema® over the traditional steel wire ropes.
Dredging International had already used Dyneema® in a complex project to dredge a small lake in Sweden. Due to local restrictions and the size of the lake only small boats could be used to position the mooring lines. Steel wire ropes would have been too heavy and bulky for the small boats to handle so they looked at Dyneema®. 12 strand braided ropes made with Dyneema® were used over a 2 month operation and the rope performed. Jorne Beyen, Project Engineer said, “we experienced much easier rope handling and much faster rope positioning.”
One of the biggest advantages of Dyneema® is that they are very light in weight, for example, for the same strength and diameter as a steel wire rope a rope made with Dyneema® will have 1/7 of the weight. This means the rope is easier to handle and ultimately enables people to work faster. This can be critical to the success of a project. Jorne Beyen explains; “The exceptional properties of Dyneema® made it possible for us to reposition the ropes quicker and easier. We were able to save about 30% of the time to reposition, which comes down to 4 to 5 hours of savings per repositioning operation. The rope could be winched with tension ranging from 60 to 90mt, with no issue whatsoever.”
Another major advantage of ropes made with Dyneema® is safety. This is the most important aspect. Ropes made with Dyneema® are:
- Lighter and so ultimately there are fewer injuries to backs, arms and legs.
- Made from a smooth abrasion-resistant fibre. When steel wire ropes fray they can expose sharp edges or hooks.
- Unlikely to snap back, whereas if a wire rope snaps back it can cause nasty injuries.
- Unlike steel, Dyneema® ropes do not require grease or oil which makes for a cleaner and safer working environment.
Invest in Dyneema®
Ropes made with Dyneema® are more expensive than many other synthetic ropes and steel wire rope, but the improved productivity through ease and speed of handling and improved safety more than negate these extra costs. In many cases the period of time to payback the initial investment is surprisingly short.
All of the crew at Dredging International who handled the mooring lines made with Dyneema® were satisfied with the performance and ease of operation.
The advantages of using Dyneema® mooring lines are:
- Faster handling
- Easier to handle and maneuver
- Reduced maintenance
- Improved safety
- Cleaner working environment, as no grease or oil required
To find out more about how ropes made with Dyneema® can help your operation, please contact us.