Synthetic Tethers

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Synthetic Tethers

Synthetic Tethers

Secure tethering

With growing consolidation of offshore oil and gas fields, through longer tie backs, the integrity and reliability of synthetic fibre tethers are crucial in ensuring the smooth flow of oil to surface processing facilities. Lankhorst Offshore’s high performance tethers provide an effective method of securing risers, umbilicals and mooring mid-water arches connected to subsea production systems such as well manifolds, wellheads, Christmas trees and well jumpers.

Lankhorst deepwater tethers are project specific and engineered to withstand the prevailing subsea conditions. Rope construction and performance that has set the standard for deepwater moorings provides the strength and mechanical performance expected of these long-term tethers.

The synthetic tethers are available as either a LANKO®FORCE or GAMA 98® rope construction in Dyneema®. The high modulus polyethylene core provides the strength and mechanical performance expected of these subsea tethers. The entire rope core is protected by a braided jacket and polyurethane coating and includes ROV handling points for ease of installation and maximum service life.

All riser, umbilical and mid-water arch tethers are manufactured at the Lankhorst Offshore deepwater rope production facility in Portugal. In addition to industry leading, rope manufacture and test facilities, the company’s rope engineering team is able to provide comprehensive technical support at every stage of tether production. During tether installation, Lankhorst is able to ensure that experienced service engineers are on hand to monitor on-site handling and installation, as required.

Lankhorst synthetic tethers are highly technical products that provide the highest levels of mechanical and fatigue performance for production critical risers, umbilicals and midwater arches over many years.

Why Lankhorst Offshore?

Lankhorst Offshore synthetic fibre tethers have a proven track in demanding offshore applications such as riser and umbilical tethers and mooring mid-water arches. The use of synthetic fibre tethers such as the LANKO®FORCE and GAMA98® with Dyneema® has significant performance advantages over chain and steel wire tethers. In addition to being lighter and with almost neutral buoyancy, synthetic fibre tethers offer reduced cost of buoyancy elements, no corrosion, no fatigue issues and easy system installation.

LANKO®FORCE and GAMA98® Dyneema® ropes has the same (or lower) diameter as a conventional steel wire rope yet the corresponding weight is 7 times lower. In water, it has negligible weight. The stiffness is similar to steel wire. Filter elements are included between jacket and sub-rope cores. They are effective in filtering out particles greater than 5 microns whilst allowing free flooding of the rope. Under constant loading, the LANKO®FORCE and GAMA98® Dyneema® rope can show an irreversible deformation that will depend on the time, load and temperature. For 25 years and for normal water temperatures, the irreversible elongation (creep) is null. The fatigue life of synthetic ropes is typically quoted as being at least 80 decades superior to steel wire rope.

Lankhorst Offshore has a dedicated rope test machine for loads up to 1,200 tonnes. It can also conduct tension-tension fatigue testing of ropes to any fatigue regime specified by clients and certified verification authorities. The test facility can be used for proof loading and length verification of tethers up to 25m in accordance with various industry standards such as ABS, BV and DNV GL rules.

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12 strand braided

LANKO®FORCE WITH POLYESTER JACKET R30

12 strand braided

LANKO®FORCE WITH TIPTO® JACKET R31

12 strand braided

LANKO®FORCE WITH DYNEEMA® JACKET R32

parallel

Gama98® with Dyneema®

rope selection

highly technical products

Lankhorst synthetic tethers are highly technical products that provide the highest levels of mechanical and fatigue performance for production critical risers, umbilicals and midwater arches over many years.

The synthetic tethers are available as either a LANKO®FORCE or GAMA 98® rope construction in Dyneema®. The high modulus polyethylene core provides the strength and mechanical performance expected of these subsea tethers. The entire rope core is protected by a braided jacket and polyurethane coating and includes ROV handling points for ease of installation and maximum service life.

All riser, umbilical and mid-water arch tethers are manufactured at the Lankhorst Offshore deepwater rope production facility in Portugal. In addition to industry leading, rope manufacture and test facilities, the company’s rope engineering team is able to provide comprehensive technical support at every stage of tether production. During tether installation, Lankhorst is able to ensure that experienced service engineers are on hand to monitor on-site handling and installation, as required.