Hornsey 20” Pipe Bridge Replacement

Barhale, through Optimise, were instructed to isolate and repair a burst
section of a 20” water main, as it crossed over the New River aqueduct,
close to the Hornsey WTW. The Emergency works carried out for
Thames Water were completed in 2 phases.

Phase 1 consisted of isolating the water main 500m away from
the damaged section, using a linestop and installing a valve
arrangement.

Phase 2 of the works included; twice daily infusion works to
maintain pressure in the live network behind the newly installed
valves, investigative works including boreholes and NDTs and the
replacement of the damaged section of the pipebridge.