Integrity issue 

A 42 inch hot air line was suffering from  both external corrosion. Close to a  flange face over time the external  corrosion had created a through wall  defect. A long term solution was sought  and therefore an engineered  Futurewrap repair was proposed. To  reinstate the integrity of this section of this elevated 42 inch line, it was  proposed to use a Futurewrap Glass/HT  composite repair. 

Design  

The design of the Futurewrap Glass/HT repair was to strengthen the pipework  and seal the through wall defect. The design parameters were; pressure 3 bar,  temperature 1400C, design lifetime 20 years. It was assumed that the  composite repair would carry all the  applied load. The repair design resulted  in a thickness of 4.8 mm (6 layers) of  Futurewrap Glass/HT composite repair  with an axial length of 300 mm. 

Installation 

The installation steps are shown in the  photographs. The repair was applied off  ropes as the pipework is elevated. The  surface preparation was to Sa2.5. Full  QA/QC measurements were made to  demonstrate that the Futurewrap repair  was applied in accordance with ISO  24817. 

Summary 

A 42 inch air line suffering external  corrosion was repaired using Futurewrap  Glass/HT composite repair. The repair  was completed within 1 days reinstating the integrity of the pipework.