Case study – 2 inch high pressure hydrocarbon line
Integrity issue
A 2 inch high pressure hydrocarbon line was suffering from external corrosion. The external corrosion was sufficiently severe in places that remaining wall thickness would not provide sufficient strength to withstand the high design pressure. It was proposed to use a Futurewrap composite repair to reinstate the integrity of the pipework.
Design
The design of the Futurewrap repair was according to ISO 24817. The design approach was for pipework strengthening only. The design parameters were; internal pressure 248 bar, temperature 400C, design lifetime 20 years, through wall defect. The repair design resulted in a thickness of 19 mm (23 layers) of Futurewrap Glass/LT composite repair with an axial length of 2100 mm.
Installation
The installation steps are shown in the photographs. The pipework was depressurised. 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 2 inch high pressure hydrocarbon line suffering external corrosion was repaired using Futurewrap Glass/LT composite repair. The repair was completed within 3 days allowing the pipework to be re-pressurised returning the pipework to its original integrity.
