Current flow around a pipeline can result in vibration due to vortex shedding. The frequency of this vibration can become close to the natural frequency of the pipe, which could cause catastrophic fatigue or damage the pipeline. Trelleborg Offshore offer PU VIV strakes to suppress Vortex Induced Vibration (VIV).
Polyurethane strakes offer the benefits of traditional cable and flowline impact and abrasion protection with a helical profile for effective VIV suppression. The product is manufactured in marine grade polyurethane (PU).
PU VIV suppression strakes can accommodate high installation loads encountered during S-lay or J-lay. Strake design can be a triangular or trapezoidal profile to offer varying degrees of flexibility during installation.
Proven strake geometries include 16-17.5D pitch x 0.25D fin height or 5D pitch x 0.14D fin height. Computational fluid dynamics has been undertaken to gain a clear understanding of the most effective geometries for effective VIV suppression.
PU VIV strakes can be designed to suit specific customer requirements. Previous designs include one piece ‘wrap around’ mouldings with castellated or socket/spigot ends or interlocking half shells.
View PU Tri-Strakes® S