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4 Inch Natural Gas Vent Line

The 4” Natural Gas vent line has suffered from external corrosion

Nature of Defect

The 4” Natural Gas vent line has suffered from external corrosion. Inspection reports show RWT of 0.3mm at the 6 o clock position adjacent to the weld. The client requires a composite repair to halt any further corrosion and to bring the line back up to full design.

Solution

Metalyte Pipeworks solution was to apply 18 layers of their bespoke field applied composite system. This would halt any further corrosion issues and build the strength back in to the line for full operational requirements.

Repair Method

The full length of the repair area was shot blasted to Sa 2.5 to remove all corrosion and gain the surface profile required for the composite to adhere to.
The corrosion pit was built up using a high compression load transfer material. Once fully cured, the pipe surface then had a resin bond coat applied prior to the application of the composite. The line was then wrapped in 18 layers of composite and allowed to cure.