page_title: Wire rope spooling technology
section_title: System advantages
hierarchical_section_title: Wire rope spooling technology / System advantages
caption_attribution_description: Deutsch: Prinzip Mehrlagen-Seilspulung Abb.3 English: Principle of multilayer wire rope spooling #3
context_page_description: Wire rope spooling-Technology is the technology to prevent wire rope getting snagged when spooled especially in multiple layers on a drum.
context_section_description: With the parallel groove system, rope wear is considerably reduced in multilayer spooling. 
  When the first layer has filled the drum, the second layer then travels back across the drum with each wrap of rope sitting precisely along the groove of two wraps of the first layer.
  With parallel grooving it is possible to calculate the exact forces that the rope imposes on the drum because the spooling is controlled. 
  Cross winding is reduced to approximately 20% of the circumference of the drum, and 80% remains parallel to the flanges in the inner layer rope groove.
  This parallel grooving evenly distributes the load between the individual layers and has been shown to increase substantially – by more than 500%, tests have shown – the life of the wire rope. The system has been used to mount ropes up. 
  In offshore applications, huge lengths of rope are often housed on drums. The anchor winches on Saipem's Semac 1 pipe laying barge, for example, each hold 2,800 metres of 76mm (3 inch) diameter wire rope in 14 layers. Saipem's Castorone, the world's largest pipe laying vessel uses a wire rope that is 3,850m long and 152mm in diameter. It weighs 420t.  The rope is pulled by capstan and stored on a massive Rema traction winches that feature the parallel grooving system, with an approximately back tension of 40t on the capstan.
caption: Multilayer wire rope Spooling Pic 3
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