NATURE OF DEFECT
The 12” line had suffered from internal corrosion. This resulted in a through wall defect. The client required a composite repair to seal the leak locations and to bring the line back up to its full design specification.
SOLUTION
Metalyte Pipework’s produced a repair method using a bespoke leak sealing composite to seal the leaks with a minimum overwrap of 4 layers of Dragon-Q-STD composite system.
REPAIR METHOD
A high strength leak sealing composite was used to seal the leaks live creating a full composite enclosure. The substrate was prepared (excluding the identified defect area) using an MBX machine to gain a surface profile to SSP.SP11. The geometry of the flange / valve faces were profiled and 2 layers of Herculyte LV impregnated cloth was applied as a bonding coat to the entire repair area prior to application of the Dragon composite. Once the Herculyte LV was fully cured, the repair area was wrapped in 4 layers of Engineered Dragon-Q-STD composite and allowed to cure until a minimum of 74.5 “Shore D” hardness was achieved.
