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Case study - 10 inch HP flare line

Integrity issue

A 10 inch mixed HP flare line was suffering from external corrosion. The external corrosion was so severe in places that the design premise was to assume a through wall defect. It was proposed to use a FutureWrap composite repair to reinstate the integrity of the pipework.

Design

The design of the FutureWrap repair was according to ISO 24817.  The design approach was for pipework strengthening and leak sealing. The design parameters were; internal pressure 8.1 bar, temperature 90⁰C, design lifetime 10 years, through wall defect. The repair design resulted in a thickness of 5 mm (6 layers) of FutureWrap Glass/LT composite repair with an axial length of 5300 mm.

Installation

The installation steps are shown in the photographs. The pipework was depressurised. The surface preparation was to ST3. Full QA/QC measurements were made to demonstrate that the FutureWrap repair was applied in accordance with ISO 24817.

Summary

A 10 inch HP flare line suffering external corrosion was repaired using FutureWrap Glass/LT composite repair.  The repair was completed within 4 days allowing the pipework to be re-pressurised returning the pipework to its original integrity.