Internal joint sealing closes a leaking pipe joint from within the pipe, typically using a packer and either a hydrophilic seal, an elastomeric compression seal or an injected silicate or polyurethane grout. The technique is used where CCTV identifies a single open joint as the source of root ingress, infiltration during rainfall or leakage of foul flows into the ground. Works are usually completed in two to four hours per joint, including pre-clean, installation and a post-works CCTV verification. Joint sealing is appropriate for sound clay or concrete pipes with localised joint failure and is not a remedy for structural breakage, which requires lining or replacement. Materials should be selected for compatibility with foul or surface water service in accordance with BS EN ISO 11296.
Joint sealing (drain)
Internal sealing of leaking pipe joints to stop infiltration or exfiltration.
