Riser Repair - Structural and Pressure Containing
Scope
The repair had the following specifications:
| Structure | Riser |
| Surface Preparation | Sa2.5 |
| Technowrap Fibre |
Carbon (triaxial) Carbon (uniaxial) Glass (triaxial) |
| Design Pressure | 125bar |
| Design Temperature | 80 °C |
| Design Life | 20 years |
| Wrap / Repair Length | 500mm |
| Corrosion Type | External |
| Axial Loading | 331kN |
| Bending Moment | 143kNm |
| Design Code | ISO 24817 & ASME B31.8 |
Overview
A 500mm NB gas riser on an offshore platform had experienced significant wall thinning due to external corrosion below the platform sea deck. A TechnowrapTM solution was provided which met the required standards of ASME B31.8 (gas transmission and distribution, as an AEA class 3 pipe repair) and ISO 24817 with structural loadings for axial and bending moment. The repair documentation included drawings, work method statement, detailed design and the typical ICR.IAS JV quality documentation.
Solution
- Combination of TechnowrapTM fibres to deliver the structural requirements and minimise material and labour costs
- Technowrap 2K™ LT system used to wrap all fibre types
Benefits
- ICR.IAS JV Repair register to track repair details
- Local ICR.IAS JV engineering experience driving the scope
- No hot work required to complete the repair
- No shut-down required, maintaining platform productivity
- Documented QA/QC procedures provide an excellent record of the repair materials and application process for future reference
Image Gallery
Need a solution?
Need a solution?
Leave your contact details along with any relevent project descriptions and photos, and we will get back to you with a solution.