NATURE OF DEFECT
The 8” H2S line had suffered from internal erosion. This resulted in a through wall defect close to the weld on the flange. The client required a composite repair to seal the leak location and to bring the line back up to its full design specification.
SOLUTION
Metalyte Pipeworks produced a repair method using Herculyte epoxies to seal the defects with a minimum overwrap of 4 layers of Dragon X composite system.
Repair method
Herculyte epoxies were fully mixed and inserted over the defected area. The surface was be prepared (excluding the identified defect area) using an MBX machine to gain a surface profile to SSP.SP11
A minimum of 500 microns of Dragon resin was applied as a bonding coat to the entire repair area prior to application of the Dragon composite. The repair area was wrapped in a minimum of 4 layers of Engineered Dragon-X composite.
The composite repair was then cured until a minimum of 74.5 Shore D hardness was achieved.
