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CRA Pipeline Repair Method Development

CRA Pipeline Repair Method Development

Benefits
The key benefit of this novel CRA repair method design is to substantially reduce the cost of CRA pipeline repair by avoiding the need for a pipelay vessel. Atteris’ (and alliance partner Saltel’s) repair method design ultimately received a “Statement of Endorsement” from DNVGL and is (as at Q2 2018) now ready for the next phase of technology qualification - full scale qualification testing.
Background
Currently there are few methods for repair of a damaged subsea CRA-clad / CRA-lined pipeline. Hyperbaric welding of CRA is technically difficult and in various situations may not be possible. Currently available mechanical clamps / connectors cannot maintain continuity of the CRA cladding / liner. Mobilising a pipelay vessel to repair the pipeline may take too long and is expensive.
Atteris and Saltel have formed an alliance to develop a CRA pipeline repair method which utilises Saltel's existing expandable patch technology (which is field-proven for well downhole repair) in combination with commercially available pipeline connectors / couplings.
Work Performed by Atteris

Atteris and Saltel compiled current industry knowledge and published information on the internal patch repair method and its compatibility with pipeline design codes, then defined Woodside’s pipeline design data ranges and other key data (e.g. mechanical connectors, defect properties, etc.) that will affect the repair method. A detailed Failure Mode Effects and Criticality (FMECA) workshop was conducted to identify key risks to the design and then all issues were either designed-out or addressed in the qualification programme scope. The repair method design ultimately received a “Statement of Endorsement” from DNVGL and is (as at Q2 2018) now ready for the next phase of technology qualification – full scale qualification testing.

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