Sea Water Infiltration Eliminated in a Single Tidal Window
Hydro Logic was engaged by the owners corporation of a coastal apartment building to address a significant and ongoing infiltration problem. Sea water was entering the building's sewer system through cracked and misaligned pipe joints, overwhelming the Sydney Water pump system downstream. The presence of sea water in the sewer network was generating methane gas, creating a highly corrosive environment that was accelerating deterioration of the asset infrastructure. A trenchless inversion lining solution was specified to seal the pipeline, eliminate inflow and protect the asset from further chemical attack.
Tidal Scheduling and Same-Night Reinstatement
The coastal location of the asset introduced a constraint not present on standard urban rehabilitation projects. Works could only be safely executed at low tide, requiring precise scheduling around tidal windows to ensure conditions were suitable for access, preparation and lining installation.
The program was structured to complete the full 22 metres of lining in a single continuous operation, allowing the sewer system to be returned to service the same night. Any failure to complete within the tidal window would have required the works to be postponed, leaving the asset exposed and the pump system compromised for a further tidal cycle.
Before — Tidal Infiltration
After — Relined and Sealed
22 Metres in One Hit — Inversion Drum and Boiler System
Hydro Logic relined 22 metres of 100mm and 150mm pipework in a single continuous operation using an inversion drum and boiler system, which significantly accelerated the curing process and allowed the full liner to be installed and cured within the available tidal window. Prior to lining, the pipework was cleaned using high-pressure water jetting to remove debris and prepare the surface.
Three branch line connections from accessible stacks underneath the building were reinstated following the lining installation. While on site, Hydro Logic also inspected other accessible mainlines and identified additional defects for future remediation.
Same-Night Reinstatement. Sea Water Inflow Permanently Closed.
The 22 metres of deteriorated pipework was relined and returned to full service within the same night, meeting Sydney Water's requirements and eliminating sea water inflow at source. All cracked and misaligned joints were sealed, three branch line connections were reinstated and a post-installation report was provided to Sydney Water confirming the condition of the rehabilitated asset. The methane-generating inflow pathway was permanently closed, protecting the remaining infrastructure from ongoing corrosive attack.