Integrity issue 

A 24 inch manifold section of 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 these sections 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  1 mm/year. The design parameters were;  pressure 154 bar, temperature 1000C,  design lifetime 2 years. It was assumed  that the remaining wall thickness at the  end of design life was 15 mm. An HT  repair was used as the pipework surface  temperature during application would  be 700C implying that rapid curing of the  repair during installation would be an  issue. The repair design resulted in a  thickness of 18.9 mm (16 layers) of  Futurewrap Carbon/HT composite repair  with an axial length of 1050 mm. 

Installation 

The installation steps are shown in the  photographs. The surface preparation  was to Sa2.5. 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 24 inch manifold section of export  pipework system suffering internal  corrosion was repaired using Futurewrap  Carbon/HT composite repair. The repair