Pipeline Isolation, Integrity, Testing, Connection, Repair & Maintenance

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PROCESS & PIPELINE REPAIR
> Caisson Repair
> Caisson Liners
 

Due to their harsh environment, caissons can experience severe external corrosion at the waterline and galvanic corrosion / erosion at the pump string location. This can result in a lack of integrity, and occasionally result in part, or all of the caisson becoming detached and lost to the seabed. Should a caisson become detached this would pose a serious safety concern for a platform and risk damage to subsea pipelines and equipment, impacting on production and reputation.

External repair is often complicated by pipe supports and safe access close to the waterline. Caissons however, often offer direct bore access to the defect. Liners can be used to provide a solution to the above integrity issues and can reinforce the caisson. The liners can be designed to seal over / around a defect area, and can also mechanically grip the caisson above and below the defect / fracture / thinning therefore restoring structural integrity.

More Information > Case Study
 
Caisson Liner - Trial
Lower section of 95 meter liner showing mechanical locks & dual compression seals
 
Key Features:  
Inserted into bore to support & repair damaged section
Liners are preferable to external clamps due to easier access to bore than pipe OD
Liner limitations are due to bore restriction of caisson at defect area
Bore restriction will depend on caisson diameter, clearance diameter on liner to pass bore restrictions and reinforcement requirements of defect
Caisson liners available to suit application.
Compression elastomer seals compliant to poor bore surfaces
Liner positioned and activated by removable tooling
Designed to minimise bore restriction