T-Strake™ - VIV Suppression Strakes - Trelleborg Offshore

Trelleborg Launches New Subsea Vibration Suppression System
Trelleborg’s offshore operation has launched an innovative new vortex induced vibration (VIV) system. The high performance T-Strake™ features a unique modular design enabling more efficient transportation and installation. 

Jonathan Fox, senior product development engineer for Trelleborg’s offshore operation, says: “Pipelines unsupported over free spans, such as steel catenary risers and rigid steel flowlines, are prone to VIV fatigue, which can lead to serious issues such as pipe girth weld failure or premature pipe malfunction. To combat this, the T-Strake™ comprises interlocking moldings, with three-start helical strakes.”

Trelleborg utilized its vast offshore and VIV knowledge in the design of the T-Strake™ and carried out extensive computational analysis and physical testing. The system has a high temperature resistance, is capable of withstanding installation loads and is available in a wide choice of colors.

Host of benefits
Each section of the system has been designed as a single component, ensuring it is quick and easy to pre-install onshore or install offshore. The design enables the system to be stacked during shipping, ensuring more efficient and cost effective transportation.

Trelleborg’s innovative manufacturing process also means that the T-Strake™ can be produced up to six times faster than systems manufactured using traditional techniques, ensuring short order times.

Response to demand
Austin Harbison, new product development manager, for Trelleborg’s offshore operation, added: “The T-Strake™ was developed in response to market demand for a high quality, cost-effective VIV suppression solution. We utilized an innovative manufacturing technique enabling rapid manufacture, reduced transportation costs and quick installation.

“Working with polymers across a number of technologies and industries, we were able to use our insight and innovation to improve VIV suppression performance using best-value engineered solutions.”