NATURE OF DEFECT
The 12” line had suffered from a crack spreading 180°C across the pipe at the bottom of the line which is 100mm from the floor. This resulted in a large crack tracking around the pipe very close to the ground. The client required a composite repair to seal the leak locations and to bring the line back up to its full design specification and prevent a shutdown of the unit.
SOLUTION
Metalyte Pipeworks produced a repair method using a high tensile leak sealing composite to arrest the leak with a minimum overwrap of 6 layers of Sea Dragon composite system.
REPAIR METHOD
Low profile clamps were used to steam the leak and reduce the volume of water. Once tightened and secure, a high strength injectable composite was be applied over the leak. The substrate surface was prepared (excluding the identified defect area) using an MBX machine to gain a surface profile to SSP.SP11.
Surface defects within the immediate repair area were repaired using Herculyte resins and 500 microns of Dragon resin was applied as a bonding coat to the entire repair area prior to application of the Sea Dragon composite. The repair was wrapped in 6 layers of Engineered Sea Dragon composite and applied onto the concrete and allowed to cure until a minimum of 74.5 “Shore D” hardness was achieved.
