VortexVines™ are the new generation of helical strakes offered exclusively by VIV Solutions®. Helical strakes are a tried-and-true solution for suppressing vortex-induced vibration (VIV) of subsea tubulars such as risers, tendons, and pipelines. Helical strakes are also a popular choice for structures in wind such as industrial chimney stacks and even car antennas.
Traditional helical strakes for subsea use consist of a cylindrical shell having three (3) fins protruding from the surface. These fins extend helically around the shell and are circumferentially equidistant from each other. While most helical strakes are quite effective at suppressing VIV, the presence of the shell causes increased weight, increased use of plastic, and increased cost.
VortexVines eliminate the shell associated with traditional helical strakes and, instead, consist only of fins. These fins still extend helically around the shell and are installed to be circumferentially equidistant from each other. VortexVines are designed for safe, efficient handling and are manufactured from virgin grade, UV-stabilized high-density polyethylene (HDPE). Each strake assembly typically includes three (3) strake fins and three (3) strapping bands, however other band densities and number of fins can be used. VortexVines are unique in that the three (3) fins are not physically connected by a plastic body, or shell, but rather they are integrated with the strapping bands to form a single assembly.
Technical Specificatoins
VortexVines Helical Strakes
for Subsea Applications
- Triple start helix
- Fin height = 0.15-0.25D
- Pitch = 12-18D
- Cd ~ 1.3-1.8
- Efficiency ≥ 95%
VortexVines Helical Strakes for
Wind Applications
- Triple start helix
- Fin height = 0.03-0.12D
- Pitch = 3-6D
- Cd ~ 1.0-1.3
- Efficiency ≥ 90%
D = outer shell diameter