This year, Fortatech has begun to offer cable pulling hoses for torsionable cables in wind turbines. The tests carried out on the 16-meter-tall Brugg Cables testing facility have verified the unique properties of the cable pulling hoses.
Cable pulling hoses help to lay cables securely and suspend them in a way that relieves strain. The flexible, cylindrical mesh adapts to the diameter of the cable and fixes to the cable coating in a nonslip manner. This ensures that tensile forces are transferred via a frictional connection. The highly flexible cable pulling hoses are designed and manufactured according to customer-specific requirements; they are manually braided from three strands of rustproof wire rope and assembled using a thimble. The 16-meter-tall Brugg Cables testing facility is perfectly suited to testing the hoses as regards torsional movements.
The cable pulling hoses were used in the test tower exactly as they would be in a real-life situation and were tested in 10,000 torsion cycles. A servo drive at the top of the structure rotated the cables enclosed by the cable pulling hoses. The tests confirmed that the pulling hoses can withstand a tensile force of 11.7 kn and a tear-out force of 35.1 kn. The pulling hoses also demonstrate a high temperature resistance and, thanks to their clever design, do not slip off the cables even when torsion is applied.
These test results give fortatech a vital competitive edge and pave the way for drumming up new contracts in the wind power sector.