Case study 48 – 6 inch drains caisson nozzle
A 6 inch drains caisson nozzle had an expired composite repair applied. The integrity of the drain line was restored using a FutureWrap Glass/LT composite repair.
Integrity issue
A 6 inch drains caisson nozzle had previously been repaired using an engineered composite repair. The design lifetime of the existing repair had expired. It was proposed to use a FutureWrap composite repair to overwrap the existing repair to reinstate the pipework integrity.
Design
The design of the Futurewrap repair was according to ISO 24817. The design approach was for the composite repair to strengthen and seal (assuming that the existing repair would fail) The design parameters were; internal pressure 3.5 bar, temperature 600C, design lifetime 10 years. The repair design resulted in a thickness of 5 mm (6 layers) of FutureWrap Glass/LT composite repair with an axial length of 1300 mm.
Installation
The installation steps are shown in the photographs from surface preparation through to final curing of the 6 layers of the FutureWrap Glass/LT repair. The surface preparation was ST2. Full QA/QC measurements were made to demonstrate that the FutureWrap repair was applied in accordance with ISO 24817.
Summary
A 6 inch drains caisson nozzle had an expired composite repair applied. The integrity of the drain line was restored using a FutureWrap Glass/LT composite repair.
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Initial condition of pipework and repair
After surface preparation
During repair installation
