VIV Shedding Strakes

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The petroleum industry has been doing increasing amounts of development in deepwater areas. Drilling and production pipes used in deepwater applications are subject to a phenomenon known as Vortex Induced Vibrations (VIVs). When water flows around a cylinder, small vortices are formed on the leeward side, exciting vibrations within the pipeline. Since a deepwater pipeline is long and unsupported over most of its length, these vibrations significantly reduce its fatigue life.

APP has developed a unique system of helical strakes, which shed the vortices away from the pipeline, thereby minimizing VIVs. Our unique system has been developed through strict analysis and testing by our engineering staff. Through input from major gas and oil companies, engineering firms, and pipeline installation companies, APP has developed a strake system that not only efficiently shed vortices, but is also extremely durable. APP's strake system has the following benefits:

  • Extremely durable polyurethane system, utilizing materials used in the offshore industry for over 15 years
  • Ease of installation - we have worked with installation contractors to optimize installation time and cost
  • Anti-fouling agents prevent marine growth from growing between and on strakes
  • Structural testing in excess of 30,000 pounds (as shown in these images) have been performed on our strake system with ZERO FAILURES.

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