10in laminar defect repair on refined products pipeline case study canada

7/25/2019 10in Laminar Defect Repair on Refined Products Pipeline Case Study Canada

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Canada 12 Refined Products Pipeline

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Customer: Liquids Pipeline Operator

Location: Canada

Pipe Diameter: 10

Design Pressure: 1440 psi

Pipe Contents:Refined Products (Gasoline, Diesel, Jet Fuel, etc.)

Pipe Defect: Laminar Manufacturing Defect

Development:

This regulated, refined products pipeline developed a laminar flaw during the manufacturing ofthe pipe. Cut out and replacement was not an option, as customers in the province required the

refined products that were flowing through the pipeline. Lamination was found in closeproximity to a nearby girth weld, limiting the potential use of other traditional repair methods

such as a welded sleeve or a rigid composite repair. Shutdown would have cost the company

thousands of dollars. Following are pictures of the damaged pipe.

Design:

Citadel Technologies team of project engineers designed a repair for the laminar defect

according to ASME PCC-2 Article 4.1, and recommended a DiamondWrap HPTM

repairsolution. 6 layers of DiamondWrap HP

TMwere required to repair the defect, even with the

high design pressure.


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Installation:

Citadel teamed with an experienced group of trained installers that worked for the companyperforming the digs. The pipeline operator saved considerable amounts of money because the

digging company was able to employ non-welding labor to complete the install. Additionally,the pipeline operator did not have to call out two separate companies to complete the digging and

the installation, as the contractor was able to safely complete both operations. The highcompressive modulus filler putty was installed in the defect areas and around the welds to

transfer the load to the carbon fiber repair system. The primer was installed next to increase thebond between the repair and the pipe. 6 layers of carbon fiber were installed over a 1.5 meter

repair length to repair the lamination defect.

The actual installation time was approximately 1.5 hours, with just two trained technicians. Noheavy equipment or hot work was required for the installation, and the line remained in operation

with no disruption to production. The repair was installed and cured in the same day, allowingthe inspector and digging crew to move on to the next anomaly. Below are photos of the

completed repair.


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Conclusion:

This pipeline was able to maintain full operation throughout the installation of the repair with no

need to shut down or reduce capacity. The pipeline operator was able to save time and money bychoosing to use DiamondWrap HP

TMto repair this pipeline defect. Citadel Technologies

successfully partnered with its Canadian partner to successfully design, install, and cure thisengineered repair.

10in laminar defect repair on refined products pipeline case study canada

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