Case study – 8 inch mixed black drain pipework
Integrity issue
An 8 inch mixed Black drain pipework was suffering from internal corrosion. Localised internal corrosion had caused severe pitting which was expected to go through wall within months. 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 and leak sealing. The design parameters were; internal pressure 12.5 bar, temperature 900C, design lifetime 10 years, through wall defect. The repair design resulted in a thickness of 7.6 mm (10 layers) of FutureWrap Glass/LT composite repair with an axial length of 600 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 8 inch mixed black water pipework suffering internal corrosion was repaired using FutureWrap Glass/LT composite repair. The repair was completed within 2 days allowing the pipework to be re-pressurised returning the pipework to its original integrity.
