Utility service provider P.N. Daly has reduced water leakage to an all-time low in south London with the aid of HWM’s leak detection equipment. In a separate project in Guildford, HWM noise loggers have helped P.N. Daly to save 5Ml of water a day.

“HWM’s kit has helped us to achieve a record reduction in water leakage in the south London area,” said Tony Gwynne, national manager at P.N. Daly.

P.N. Daly carried out a year-long project on behalf of Thames Water in London and Guildford. Focusing mainly on areas with cast iron pipes, the company used 580 Permalog®+ noise loggers from HWM in a lift-and-shift data collection mode to enable rapid deployment.

On average, HWM’s equipment enabled the six-person noise-logging team to identify 299 leaks a month, of which 232 proved genuine, a 78 per cent conversion rate.

“We had a choice of suppliers, but we decided that for our process in south London we really wanted the Permalog+ equipment,” Tony explained. “We knew that it was a reliable piece of kit and that it would give us what we needed as an acoustic logging technique.”

As part of an improvement programme in Guildford, Permalog+ helped to reduce leakage from 17 Ml to 12 Ml a day, the lowest target Guildford has achieved for several years.

P.N. Daly is currently using Permalog+ in Birmingham, with encouraging results.