Method for sealing the end of a thermoplastic composite pipe and pipe obtained

The method uses dynamic gas spraying of semi-crystalline and amorphous thermoplastics to seal thermoplastic composite pipes, addressing fluid diffusion and mechanical stress challenges, ensuring effective sealing and easy connection.

WO2026120094A1 Publication Date: 2026-06-11TECHNIPFMC SUBSEA FRANCE
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TECHNIPFMC SUBSEA FRANCE
Filing Date
2025-12-04
Publication Date
2026-06-11

AI Technical Summary

⚠Technical Problem

Existing thermoplastic composite pipes face challenges in sealing their ends to prevent fluid diffusion, which can lead to mechanical stress, corrosion, and complex installation, especially when integrated into hybrid flexible pipes.

⚗Method used

A method involving dynamic gas spraying of high-performance semi-crystalline and amorphous thermoplastics onto the ends of thermoplastic composite pipes to form a sealing layer, with an amorphous polymer junction layer to enhance adhesion without compromising mechanical properties.

🎯Benefits of technology

The method effectively seals the ends of thermoplastic composite pipes, preventing fluid diffusion and ensuring easy connection while maintaining mechanical and chemical resistance under harsh conditions.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to a method for sealing an end of a thermoplastic composite pipe, comprising steps of: - providing a thermoplastic composite pipe comprising a tubular inner sheath and a reinforcing composite structure comprising a semi-crystalline thermoplastic high-performance polymer Psc1 having a melting temperature Tf1, - depositing by dynamic gas spraying, on a portion of the reinforcing composite structure located at one of the ends of the thermoplastic composite pipe, a powder of an amorphous thermoplastic high-performance polymer Pam, whereby a bonding layer is formed - depositing by dynamic gas spraying, on at least one portion of the bonding layer, a powder of a semi-crystalline thermoplastic high-performance polymer Psc2, whereby a sealing layer is formed, and to the thermoplastic composite pipe obtained and to a flexible line comprising same.
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