US Patent 10473131 Helical strakes and collar

A vortex-induced vibration (VIV) suppression system including a strake having a cylindrical body portion dimensioned to encircle an underlying tubular and having opposing ends that form at least one gap extending from a top end to a bottom end of the body portion, a fin portion extending radially outward from the body portion and helically positioned around the body portion, and a connecting member dimensioned to secure the opposing ends of the body portion in a fixed position with respect to one another; and a collar dimensioned to encircle the underlying tubular and position the strake at a fixed axial location along the underlying tubular.