When a sluice gate failed 24 metres below the water’s surface at Thames Water’s Queen Mother reservoir near London’s Heathrow airport, there were no easy fixes available. Emptying 37m cubic metres (1,307m cu ft) of water was not an option, meaning that helmeted divers were limited to 98-minute stints in the high-pressure environment.
The risky project required a team on a floating platform with a crane to cut out the broken equipment with thermal lances, bolt a plate on to the reservoir wall, and install the new equipment. It took more than a year until last October to complete, according to Glenfield Invicta, the contractor that carried out the work for Thames Water.
