Exploration • Drilling • Field Services
Fig. 3. Schematic view of radial force.
the plastic-coated core. Plasticisation (in the form of the Plastfill core) causes punctiform pressures to be distributed across larger areas so as to ease the contact pressure per unit area exerted on the wire. Tis in turn alleviates the stress concentration and, as a result, enhances the rope’s service life. Furthermore, the plastic cover envelops the steel
core and thus the special grease contained in it, which is of paramount importance for ropes used in riser tensioner systems: Since flexural loading is concentrated in certain locations (natural even wave motion), the continuous flexural stress generates elevated temperatures in these zones. Special grease reduces fretting corrosion in the core and minimises wear. Teufelberger employs its Pro Active Core Lubrication on all ropes that are exposed to localised high alternating bending loads, for example, when used for active heave compensation or riser tensioner systems.
When analysing the cost-effectiveness of riser
Fig.4. Contact surface in the sheave groove for six-strand and eight-strand structures. Six-strand, compacted (left), QS 814 VG (right).
tensioner systems, wear on sheaves must not be ignored. Compared to six-strand ropes, eight-strand rope designs such as Teufelberger QS 814 VG entail reduced sheave wear. Tis is due to the fact that a compacted, eight-strand rope has a greater contact surface than a compacted six-strand rope. Tis reduces the contact pressure on the sheave and minimises wear. Each of the above factors contributes to the fact that eight-strand ropes such as QS 814 VG, in combination with technologies such as Superfill, Plastfill and Pro Active Core Lubrication, significantly improves the cost-effectiveness and safety on riser tensioner systems. ●
Enter 30 or ✔ at
www.engineerlive.com/iog
Dr Roland Konrad, Managing Director, TEUFELBERGER Seil Ges.m.b.H., Wels, Austria.
www.teufelberger.com
30
www.engineerlive.com
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