New DNV standard for hybrid TCPs targets improved reliability of deepwater projects

Independent energy expert and assurance provider DNV has released its latest standard for hybrid thermoplastic composite flexible pipes (TCPs) intending to facilitate the integration of innovative technologies, such as carbon fiber armor, into flexible riser designs.

DNV’s latest standard, DNV-ST-F207 for hybrid TCPs, addresses the challenges faced by conventional risers in deepwater applications, where high-top tension and corrosive environments are common.

By qualifying these technologies and ensuring their adherence to recognized international standards, specifically API Spec 17J and DNV-ST-F119, DNV aims to enhance the safety, efficiency, and sustainability of deepwater projects. 

The implementation of the new standard is expected to have significant consequences for deepwater projects, including risers becoming lighter by incorporating carbon fiber armor elements, resulting in lower top tension, and this solution provides a more sustainable and reliable option for deepwater applications. Furthermore, carbon fiber exhibits superior resistance to degradation in aggressive environments, showcasing excellent fatigue performance.

The new standard is said to combine different design methods – Working Stress Design and Load and Resistance Factor Design or partial safety factor – into a unified approach. According to DNV, through this consolidated method, components are made to withstand different kinds of stresses, and extensive tests will ensure they meet safety standards under specific conditions.

“Overall, this initiative reflects a commitment to advancing technology in the offshore industry, ensuring the highest standards of safety, efficiency, and sustainability in deepwater projects thanks to our expertise and the dedication of our global teams of specialized experts,” said Prajeev Rasiah, Executive Vice President & Regional Director Northern Europe, Energy Systems at DNV.

Last year, DNV awarded Dutch TCP technology player Strohm with a qualification for its deepwater TCP flowline, representing the first accreditation of this kind from the verification body.