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Floating vessel to use Dyneema DM20 fibre for riser tether

10 Apr '15

2 min read

Petrojarl Knarr, the first floating production, storage and offloading vessel (FPSO) is set to use Lankoforce riser tethers made with Dyneema DM20 fibre.

The production unit is present at 120 kilometres off the coast of Norway. Lankoforce is made by Lankhorst Ropes, the largest company within the Lankhorst group, and a world leading rope manufacturer. 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. Lamkoforce 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, Dyneema said in a press release.

Dyneema DM20 builds on the strength and weight advantages of other Dyneema fibre grades like SK78. However the difference is its long term performance under permanent loads. 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.

Sérgio Leite, sales director, Lankhorst Ropes Offshore Division said, “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.”

Jorn Boesten, segment manager offshore DSM Dyneema said, “Our latest grade, Dyneema DM20 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.” (GK)

Fibre2fashion News Desk - India