NATURE OF DEFECT
The 30” line had suffered from internal corrosion. This resulted in through wall defects. The client required a composite repair to bring the line back up to its full design specification.
SOLUTION
Metalyte Pipeworks produced a repair method using Herculyte epoxies to cover the defects with a minimum overwrap of 16 layers and 36 layers of Cayman composite system.
REPAIR METHOD
The substrate was prepared using an MBX machine to gain a surface profile to SSP.SP11. Steel plates were preformed to fit half the circumference of the pipe with the underside of the plate prepped using an MBX machine. Herculyte epoxies were fully mixed and applied to the prepped side of the plates and these were cold bonded over the defects. Herculyte LV resin was applied as a bonding coat to the entire repair areas prior to application of the Cayman composite. Once the Herculyte LV was part cured, the repair areas were wrapped in 16 layers and 36 layers of Engineered Cayman composite and cured until a minimum of 72 Shore D hardness was achieved.
