Integrity issue

A 20 inch tee with a hydrocarbon export pipework was suffering from internal corrosion. Further internal corrosion was expected to occur and therefore a composite repair solution was sought. To reinstate the integrity of this section of pipework it was proposed to use a Futurewrap Carbon/HT composite repair.

Design 

The design of the Futurewrap Carbon/HT repair was to strengthen the pipework assuming the internal corrosion rate was 2 mm/year. The design parameters were; pressure 100 bar, temperature 2000C, design lifetime 2 years. It was assumed that the remaining wall thickness at the end of design life was 10 mm. The repair design resulted in a thickness of 18.9 mm (16 layers) of Futurewrap Carbon/HT composite repair with an axial length of 1190 mm.

Installation

The installation steps are shown in the photographs. The surface preparation was to ST3. Rapid resin curing was controlled. Full QA/QC measurements were made to demonstrate that the Futurewrap repair was applied in accordance with ISO 24817.

Summary

A 20 inch tee section of export pipework system suffering internal corrosion was repaired using Futurewrap Carbon/HT composite repair.  The repair was