Integrity issue 

A 4 inch GRE (Fiberbond 20FR16-C) fire  water main section of pipework was  leaking from two joints. It was proposed to  reinstate the integrity of the pipework and  provide a leak sealing solution by  applying a Futurewrap composite repair.  The leaks were initially sealed using a  water activated temporary repair. 

Design  

The design of the Futurewrap repair was according to ISO 24817. The design  approach was for the composite repair to  strengthen the pipework without  allowance for any remaining GRE material and also seal the through wall (fully  circumferential) defect. The design  parameters were; pipework material GRE,  internal pressure 16 bar, temperature  930C, design lifetime 20 years. The repair  design thickness was 18 mm (22 layers) of  Futurewrap Glass/LT composite repair with  an axial length of 1500 mm. 

Installation 

The installation steps are shown in the  photographs from surface preparation  through to final curing. The surface  preparation was ST3. Full QA/QC  measurements were made to  

demonstrate that the Futurewrap repair  was applied in accordance with ISO  24817. 

Summary 

A 4 inch GRE fire water mains was  suffering from leaking joints was repaired  using a Futurewrap Glass/LT composite  repair. The repair was completed within 6 days.