Tank Roof – Surface refresh & pressure containing repairs
Scope
The repair had the following specifications:
| Structure | Tank Roof |
| Scope | Technowrap pressure containment repairs and protective coating refresh |
| Surface Preparation | Sa2.5 |
| Technowrap Fibre | Carbon (triaxial) Glass (triaxial) |
| Design Pressure | 0.14 bar |
| Design Temperature | 75°C |
| Design Life | 20 years |
| Wrap /Repair Length | 500 mm square patches |
| Number of Patches | 18 |
| Defect Diameter | 50mm |
| Defect Type | Multiple through wall defects |
| Design Code | ISO 24817 |
Overview
The roof of a 14m diameter Ammonia Tank had experienced significant wall thinning due to external corrosion and coating breakdown. TechnowrapTM patches were applied in accordance with ISO 24817 to defect locations requiring pressure containment and the whole tank roof coating was refreshed. ICR.IAS JV supplied a 4 man multi-skilled team able to perform “low dust” blasting surface preparation, coating and TechnowrapTM repairs.
Solution
- Combination of TechnowrapTM fibre types used to deliver the pressure containment and structural requirements, minimizing material and labour costs
- A multi-skilled integrated site team to reduce costs
- SpongeJetTM low dust dry abrasive blasting
- Over coated existing paint and TechnowrapTM repairs for continuous high performance coating system
Benefits
- Pressure containing patch repairs that do not corrode
- High QA/QC delivered through NACE 2 & 3 team
- No hot work required to complete the repair
- No shut-down required, maintaining platform productivity
- 20 year TechnowrapTM patch repair warranty
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