DNV issues standard for deepwater thermoplastic flexible risers

May 9, 2024
DNV has published its latest standard for hybrid thermoplastic composite flexible pipes (TCPs).

Offshore staff

OSLO, NorwayDNV has published its latest standard for hybrid thermoplastic composite flexible pipes (TCPs).

This addresses issues with conventional risers in deep water, such as high top tension and corrosive environments.

TCPs, developed as an alternative to steel risers, are said to provide a light, ductile, spoolable and corrosion-free option for transportation of liquids and gases. 

The main goal of the DNV-ST-F207 standard is to support integration of technologies such as carbon fiber armor into flexible riser designs.

Qualifying these technologies and ensuring they comply with recognized international standards, such as API Spec 17J and DNV-ST-F119, should lead to safer and more efficient deepwater developments, DNV added.

The new standard combines different design methods (working stress design and load and resistance factor design, or partial safety factor) into a unified approach. Under this standard, components should be manufactured to withstand different kinds of stresses, with extensive tests applied to ensure they meet safety standards under specific conditions.

By incorporating carbon fiber armor elements for deepwater projects, DNV added, risers should become lighter, resulting in lower top tension.  Also, carbon fiber exhibits superior resistance to degradation in aggressive environments.


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