Corrosion is one of the most common challenges affecting metallic pipelines. When corrosion reduces the wall thickness of a pipe, the remaining material may no longer provide the required structural capacity.
A half pipe sleeve can be considered as a reinforcement solution for certain corrosion-related defects.
How Does Corrosion Affect a Pipeline?
Corrosion can gradually remove material from the pipe wall.
External corrosion
May result from:
- Moisture
- Soil conditions
- Coating deterioration
- Chemicals
- Environmental exposure
Internal corrosion
Depends on the fluid and operation
Internal corrosion can be influenced by the characteristics of the transported fluid and operating conditions.
How Does a Half Pipe Sleeve Help?
A sleeve is installed around the affected pipe section.
When properly designed, the sleeve provides additional structural material around the weakened area. The objective is to support the damaged section and restore the required level of structural performance according to the repair design.
What Information Is Needed?
Selecting a sleeve for corrosion repair requires more than knowing the pipe diameter. Important information may include:
- Original wall thickness
- Minimum remaining wall thickness
- Corrosion dimensions
- Pipe grade
- Operating pressure
- Operating temperature
- Defect location
- Corrosion growth rate
- Service conditions
Why Sleeve Thickness Matters
A thicker sleeve is not automatically the correct sleeve.
The sleeve thickness must be appropriate for the engineering requirements. The design needs to account for:
- Loads
- Pipe geometry
- Material properties
- The nature of the defect
Pipeline Products Inc. states that its half pipe sleeves are available in various wall thicknesses and ASTM-grade steel plate options.
Does a Sleeve Stop Corrosion?
A reinforcement sleeve primarily addresses the structural aspect of a damaged section. It should not automatically be considered a replacement for a corrosion-control strategy.
The underlying cause of corrosion should also be investigated.
Depending on the pipeline, operators may need to consider:
- Coating condition
- Cathodic protection
- Drainage
- Inspection frequency
- Corrosion monitoring
- Material selection
Conclusion
A half pipe sleeve can be an important option when corrosion has weakened a pipeline and reinforcement is appropriate.
The best results come from combining accurate inspection, engineering assessment, appropriate sleeve design and long-term corrosion management.
Dealing with pipeline corrosion?
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