Epoxy Repair Sleeves from 4" (100mm) to 48" (1220mm)
Designed to suit all National Grid Gas Pipe lines in the UK. Both welded type (which are welded on site) and Flanged type (which are bolted on site –no welding)
Features & Benefits:
The epoxy grout compound forms an excellent bond at both steel interfaces, providing both axial and circumferential support. The combination of the steel outer shell and the epoxy grout provides significant bulging restraint, thus removing or significantly reducing the failure mechanism of defects.
Welding is not required, and the process can be performed without product interruption. ESR is probably the most technically validated method, having undergone numerous tests to simulate full pipeline life scenarios in terms of internal pressure loading and fatigue cycles. ESR has been in use on major pipeline networks for more than 16 years.
The two sleeve halves are joined by welding (to normal pipeline welding and welding inspection codes) or bolted flange. Both methods can be used to repair all types of non-leaking defects, including cracks, girth welds, seam welds, dents, gouges, corrosion and manufacturing defects, and bring the pipeline back to full working parameters. Recent developments prove that ESR can also repair internal corrosion and small leaking defects. In most cases, the repaired area is stronger than the adjacent "good" pipe.
Aggressive internal corrosion eventually perforates the pipewall, but if there is an ESR over the defect when this happens, the excellent bond between the steel and the epoxy does not allow migration of the product along the interfaces.
Small pinhole leaks can also be repaired using the ESR. However, there must be no leakage of product during the installation or cure period of the epoxy (24 hours). To ensure this, there is a patented method of stopping the leak while the ESR is installed.
Frequently Asked Questions
Specification:
- National Grid T/SP/F/15 7-100 BAR