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Production Starts at First FPSO to Use Riser Tethers Made with Dyneema®

02 April 2015 - Petrojarl Knarr, the first floating production, storage and offloading vessel (FPSO) to employ Lanko®force riser tethers made with Dyneema® DM20 fiber has gone into production, 120 kilometers off the coast of Norway.

The riser tethers, made with Dyneema® DM20, provide permanent subsea anchoring of the risers between seabed and vessel. Each of the riser tethers comprises two tethers made with Dyneema® DM20 connected to hold-down clamp with an anchor. This allows for rotation around two axes.Lanko®force riser tethers with Dyneema® DM20 are designed to hold risers and umbilicals in position and are connected to subsea production systems such as well manifolds, wellheads, Christmas trees, and well jumpers. Please read more in the Offshore magazine.

Meeting the deepwater challenge

Dyneema® DM20 builds on the strength and weight advantages of other Dyneema® fiber grades like SK78. However the difference is its long term performance under permanent loads (also known as creep performance). Through its exceptionally low and predictable creep characteristics, Dyneema® DM20 extends the range of Dyneema® applications in offshore to long-term permanently loaded systems. The result of this is that offshore operators are increasingly considering switching to ropes made with DM20 to anchor their Floating Production Units, typically in a combination with polyester. There are several reasons why: Ropes with Dyneema® are 3 times stiffer than ropes from Polyester which reduced the offset. Ropes made with Dyneema® have a much smaller diameter and lower weight than polyester ropes which facilitates installation. They also show high fatigue resistance and are weightless in water.

“Riser and umbilical tethers are very technical products that demand the highest levels of mechanical and fatigue performance over many years. The strength and durability of Lankoforce Dyneema® DM20 makes it ideal for just this type of application,” says Sérgio Leite, sales director, Lankhorst Ropes Offshore Division.

Jorn Boesten, Segment Manager Offshore DSM Dyneema says “Our latest grade, Dyneema® DM20 (Dyneema® Max Technology) builds on the strong performance of our well known Dyneema® SK78 and other grades. The use by NOV in this challenging offshore environment shows the trust the industry has in Lankhorst Ropes, DSM Dyneema and its products. This only strengthens our commitment to the offshore industry.''

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