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Radio Tower Repair
Overview
A braced circular column of a Radio Tower suffered significant section loss due to external corrosion. Due to its location on an offshore platform, no hot works were permitted during completion of the repair.
TechnowrapTM Structural Rehabilitation System (SRS) was used to provide structural reinstatement of the column.
Scope
The line had the following specifications:
| Structure | Radio Tower column & bracing member |
| Surface Preparation | St3 |
| Class Approval | N/A |
| Design Load | 750 kN |
| Design Temperature | 800C |
| Application Temperature | 200C |
| Design Life | 20 years |
| Wrap Length | 800 mm |
| Pipe Diameter | 150 mm |
| Geometry | Bracing joint / cluster |
| Corrosion Type | External |
| Defect Details | Hole (through-wall) |
Solution
The solution to this project was:
- Rope access used to complete surface preparation, application of repair and coating
- Bristle blasters used to prepare the surface to St3 and a surface profile of between 65 and 130 microns
- The large through-wall defects covered with pre-cured sections of TechnowrapTM and bonded in place to act as a former for the TechnowrapTM SRS
Benefits
The benefits of executing this solution were:
- No hot work required to complete the repair
- No shut-down required, maintaining platform productivity
- Technowrap™ SRS flexibility in application allowed the rope accessed repair works to be stopped and started as required due to weather conditions on the platform
- Documented QA/QC procedures provide an complete record of the repair materials and application process for future reference
