GORE™ OMNIBEND™ Fiber – Consistently Enhancing the Bend–Fatigue Life of Synthetic-fibre Ropes
counterparts. In fact, HMPE ropes with GORE OMNIBEND Fiber are the first synthetic ropes that are able to surpass the bending performance of steel wire ropes.
Applications such as pipe laying, installation of subsea equipment and anchor placement and
retrieval all require sophisticated lowering and lifting equipment.
Lifting Liquid Crystal Polymer
LCP fibre has characteristics that are generally desirable in ropes – it is strong, has a high modulus, is creep-resistant and is chemically inert. In addition, LCP fibre is relatively cut-resistant, but its toughness also makes it extremely self-abrasive. This, combined with its strength loss at elevated temperatures, has kept LCP fibre from being a top choice for use in ropes subjected to cyclic bending. When OMNIBEND Fiber is combined with LCP fibre, the bend–fatigue life of the resulting rope increases by an order of magnitude. As with the HMPE ropes, the ePTFE fibre forms a protective barrier between rope strands, and greatly reduces inter-strand abrasion. As there is less abrasion, more individual LCP filaments survive for a longer time and the rope’s strength is maintained.
More significant is the reduction in the rope-operating temperature provided by the addition of OMNIBEND Fiber – a point well illustrated in Figure 3, which shows the surface temperatures of the LCP rope and the LCP/ePTFE rope as a function of CBOS cycles. It is worth pointing out that internal rope temperatures in both are considerably higher.
The temperature of the LCP rope climbs rapidly through the course of the CBOS test, eventually reaching a critical temperature. With the addition of ePTFE fibre, the rope temperature increases initially, quickly reaching a stable, less damaging operating temperature. This is evidence of a shift in failure mechanism away from thermal damage to long-term self-abrasion.
Included in Figure 3 are infrared images of each rope passing over the sheave near the end of each rope’s life. These images are on the same temperature scale and are intended to help visualise the discrepancy between the operating temperatures of ropes with and without OMNIBEND Fiber.
While LCP fibre ropes have not been a top choice for bend–fatigue applications, the addition of OMNIBEND Fiber allows these ropes to be a competitive option. In fact, 19mm-diameter LCP fibre ropes have shown as much as a 10–20 times improvement when constructed with OMNIBEND Fiber. This technology allows LCP fibre ropes to be competitive in bend–fatigue performance with other rope constructions, while preserving the low-creep, high-modulus characteristics intrinsic to LCP fibre.
Alternators ExNIIT3 Zone 2 Totally Enclosed IP54/65
2X30 KVA 100 KVA
GENCOEEC LTD
Pit Lane, Ketton/UK PE9 3SZ t: 44 (0) 1780 721619 f: 44 (0) 1780 721385 e:
generators@gencoeec.co.uk w: www.touchoilandgas.com
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