Integrity issue 

A 14 inch section of duplex pipework  containing gas had mechanical  cracking at one of the welds. An  engineered Futurewrap repair was  sought to both strengthen the pipework  as well as prevent the external  atmosphere attacking the weld. To  reinstate the integrity of this section of this 14 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. The design parameters were; pressure 10 bar, temperature 1450C, design lifetime  10 years. It was assumed that the  composite repair would withstand the  applied load without any allowance for  remaining steel. The design resulted in a  thickness of 7 mm (9 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 ST3. Full  QA/QC measurements were made to  demonstrate that the Futurewrap repair  was applied in accordance with ISO  24817. 

Summary 

A 14 inch diameter production line suffering mechanical cracking at a weld was repaired using Futurewrap Glass/HT composite repair. The repair was  completed within 3 days reinstating the integrity of the pipework.