DSM has engineered Dyneema SK78 fiber in such way that it offers at least 3x the fatigue performance of generic HMPE fibers. The rope temperature models developed by DSM allow for accurate prediction of rope core temperatures in static and dynamic conditions. Thanks to this model, ropes made with Dyneema® SK78 can be used at higher operating temperatures then generic HMPE, without the danger of line failure due to tension fatigue.
Not only is the fiber designed in such a way that is more than 3x more resilient to fatigue, DSM has developed a tool to predict line behavior and inform maintenance. Using information such as rope diameter, rope construction, minimum breaking load, and metocean data, DSM’s accurate modelling can better predict the fatigue life of mooring rope under varying conditions – reducing the chance of dangerous line failures.
Because of factors like wind, waves and passing vessels, a vessel will move constantly at its berth. This movement is translated into tensions in the moorings lines. The line tensions can go from slack, having no tension at all, to high loads and vise versa within seconds. This leads to axial compression fatigue in the fibers. Dyneema® is the only HMPE fiber that is engineered to withstand the tension differences that can damage generic HMPE fibers and lead to premature failure.
Lines made with Dyneema® SK78 have proven 4x longer abrasion lifetime than HMPE in relevant application testing.
While Dyneema® SK78 delivers exceptional abrasion resistance when used in an unjacketed line, it can also be used to offer additional protection when used as a cover in a jacketed line, or as a dedicated chafe protection sleeve. In most applications, the use of DSM’s proprietary abrasion resistance coatings will further enhance the resistance to both external and internal abrasion.
Mooring lines made with Dyneema® SK78 offer at least 4x longer creep lifetime than any HMPE fiber – helping to keep mooring ropes and lines in service for longer.
he creep life of HMPE fibers is influenced by the ambient temperature and the applied load. Very high loads or a high temperature will accelerate the creep process. Those made by DSM offer the highest creep life and the lowest rope weight.
Dyneema® fiber is scientifically proven to perform very well from -40°C to 70°C, with short-term exposure up to 100°C not causing any serious loss in performance. This is well within the operating temperatures of vessel mooring lines
While individual fibers lose some strength at elevated temperatures, line strength does not deteriorate to the same degree.
DSM has invested in a temperature model that can predict rope core temperatures as a function of ambient temperature and load conditions. Contact us for further details.
Moisture does not affect rope stiffness or strength of Dyneema® fiber – making it suitable for use in cryogenic temperatures. For this reason, Dyneema® fiber is used in hoses designed for liquefied natural gas (LNG) transfer at -162°C.