D2.2.1.2 Continuously monitor Flows. Pipe failure Review flow measurements from rate higher network model Pipe failure Pressures. treatment plants and than average to optimise or Frequency reservoirs. expected pressure and accidental and location of from pipe flow. penetration. Set maximum response pipe failures. condition. times to customer complaints and failures, quality. and have procedures in number of place to isolate failures to breaks minimise their impacts. because underground Establish and publicise protocol not phone followed. line. E. coli Identify critical areas of detected in poor quality pipe. 100 ml water Define a protocol for Revise sample. contractors doing contractor underground work on protocol. other services, and check that it is being adhered to. Develop and adhere to programmed annual work as per Asset Plan. Develop pressure control programme for whole system, or selected zones, including use of: ancillary sources eg, – pressure valves and pressure sustaining valves reservoir levels, etc. Undertake an annual leak detection programme on the whole system or selected zones. Ensure suitable materials are used for network construction (see Guide D2.1). Event: INTRODUCTION OF CONTAMINATION BY PRESSURE FLUCTUATIONS cont’d D2.2.1.3 Regularly check that air Reservoir Pressure Re-examine valves are working levels. outside network model Unpredicted effectively. normal to determine event such Pressure. range. ways of as a major Undertake immediate Consumer sustaining fire. investigation of Consumers complaints. pressure water complaints. complain under these about dirty Locate reservoirs at quality. water and elevations that minimise lack of pressure pressure. Make sure recommended E. coli or fire-fighting reserves of coliforms water are maintained. detected in Use a pressure booster, if 100 ml water ancillary sources are sample after available. the event.
D2.2.1.2 Pipe failure or accidental penetration. Continuously monitor flow measurements from treatment plants and reservoirs. Set maximum response times to customer complaints and failures, and have procedures in place to isolate failures to minimise their impacts. Establish and publicise phone line. Identify critical areas of poor quality pipe. Flows. Pressures. Frequency and location of pipe failures. quality. Pipe failure rate higher than average expected from pipe condition. number of breaks because underground protocol not followed. E. coli detected in 100 ml water sample. Review network model to optimise pressure and flow. Define a protocol for contractors doing underground work on other services, and check that it is being adhered to. Develop and adhere to programmed annual work as per Asset Plan. Develop pressure control programme for whole system, or selected zones, including use of: ancillary sources – eg, pressure valves and pressure sustaining valves reservoir levels, etc. Undertake an annual leak detection programme on the whole system or selected zones. Ensure suitable materials are used for network construction (see Guide D2.1). Revise contractor protocol. Event: INTRODUCTION OF CONTAMINATION BY PRESSURE FLUCTUATIONS cont’d D2.2.1.3 Unpredicted event such as a major fire. Regularly check that air valves are working effectively. Undertake immediate investigation of water complaints. Locate reservoirs at elevations that minimise pressure Make sure recommended fire-fighting reserves of water are maintained. Use a pressure booster, if ancillary sources are available. Reservoir levels. Pressure. Consumer complaints. quality. Pressure outside normal range. Consumers complain about dirty water and lack of pressure. E. coli or coliforms detected in 100 ml water sample after the event. Re-examine network model to determine ways of sustaining pressure under these
distribution-system-pressure-feb14-v2.docx