Lankhorst VIV Strakes
Lankhorst VIV Strakes are typically recognized for their perpendicular intermittent vanes, wound around the pipe in a triple helix. The pitch of these helices is equal to 16 times the pipe OD, however alternative pitches are possible. The standard Lankhorst vane height will deliver a suppression efficiency that is well beyond the generally required 90% compared to bare pipe. The drag increase is relatively low.
VIV suppression solutions optimized for installation
Lankhorst VIV suppression strakes have been designed with ease and speed of installation as a key design feature in order to minimize the expense of offshore installation time. By using the tri-shell concept, strakes are light and installation speed is optimized. Tri-shells also have a high packing density, so that the number of supply barge movements offshore and needed deck space can be kept to a minimum.
In case of installation with heavy loads, such as by roller boxes on a J-lay tower or an S-lay stinger, Lankhorst can provide VIV suppression solutions with materials that have proven to withstand the loads. Further load and impact testing can be done in-house by the Lankhorst stinger roller test rig or the impact tower.