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High Temperature (HT) Steam Line Repair
Overview
A weld crack was found in a pump room steam line on an FPSO. This line required an in service repair without the use of hot work, met the design temperature of 1830C, and a defect modelled as a circumferential loss of 5mm was required to meet ABS class approval.
The line had the following specifications:
| Structure | Steam Line |
| Surface Preparation | Sa 2.5 |
| Class Approval | ABS |
| Design Pressure | 970 kPa |
| Design Temperature | 1380C |
| Application Temperature | 500C |
| Design Life | 2 years |
| Wrap Length | 1,000 mm |
| Pipe Diameter | 200 mm NB |
| Corrosion Type | Cracking |
| Defect Details | Circumferential through wall |
| Post Cure | Yes - heat tapes |
Solution
- Technowrap™ 2K HT system with temperature capability up to 220°C
- Heat tapes used to provided post cure temperature of 60°C - 80°C
- Crack modelled as complete section loss over weld section
- Sponge-Jet TM surface preparation used for surface preparation
Benefits
- Sponge-JetTM fully recyclable system reduced equipment and materials footprint led to improve freight costs
- Start-up design was used to bring line back on line two days quicker
- ABS approved repair
- TechnowrapTM provided both structural loads and pressure containing requirements
