Pressure Optimisation Introduction Why carry out Pressure - PowerPoint PPT Presentation

Pressure Optimisation

Introduction • Why carry out Pressure Optimisation • How and Who – Methodology • Modelling input • Leakage saving assessment • Scope of the project • Case Study – Sale Manchester

Why pressure Optimisation – Financial Implication £35,000,000 Year Active leak detection Leak repair Total 2012 ‐ 13 £7,001,760 £7,999,361 £15,001,121 £30,000,000 2011 ‐ 12 £7,460,985 £7,142,379 £14,603,364 2010 ‐ 11 £8,772,037 £16,521,899 £25,293,936 £25,000,000 Capex- Inf £20,000,000 Capex-Non Inf Opex £15,000,000 Total £10,000,000 £5,000,000 £0 2010/11 2011/12 2012/13 2010/11 2011/12 2012/13 Capex ‐ Inf £3,089,174 £4,312,230 £6,685,031 Capex ‐ Non Inf £2,129,364 £1,994,217 £1,441,168 Opex £25,293,936 £14,603,363 £15,001,120 Total £30,512,474 £20,909,810 £23,127,319

Why Pressure Optimisation - Leakage • Reduction in pressure = leakage reduction • Reduction in pressure = burst frequency reduction • Reduction in pressure variations = reduction in leakage and burst frequency How does pressure reduction reduce burst frequency ? D.Pearson, M.Fantozzi, D.Soares, T.Waldron

Methodology • Model Outputs • DMA redesign – Elevation – Boundary changes – Mains replacement • New PRV’s • Adjustment and Optimisation of existing PRV control • To reduce and “smooth” pressures in our network

DMA design – Mains replacement

Adjustment and control of PRV’s Flow Modulation • A flow modulated PRV will increase the pressure as the flow increases • This will overcome the pressure loss across the area, resulting in a more constant pressure at the CMP • A constant pressure as opposed to a fluctuation pressure may help to reduce leakage levels • Most customers would prefer steady pressure • Fire Fighting flows will be maintained

Flow Modulation vs Fixed outlet control Advanced Pressure Management via Flow Modulation; the Dartmouth Central PMA Carl D. Yates, P.Eng., Halifax Regional Water Commission, P.O. Box 8388, Stn. A, Halifax, Nova Scotia, Canada B3K 5M1 carly@hrwc.ca Graham D. MacDonald, Halifax Regional Water Commission, P.O. Box 8388, Stn. A, Halifax, Nova Scotia, Canada B3K 5M1 grahamm@hrwc.ca

Pressure reduction and mains bursts PRESSURE MANAGEMENT TO REDUCE WATER DEMAND & LEAKAGE Pank Mistry Principal Officer Water Demand Management & Leakage Control Wide Bay Water Corporation

Reports

Leakage savings Vs Cost of schemes

Project scope • First stage carried out in West Cumbria covering four WSZ’s • Second stage covered 20 WSZ’s predominantly in the Greater Manchester area. • Third Stage covers the rest of United Utilities region – 200 plus WSZ – Modelling work carried out in partnership with MWH and Atkins.

Case Study WSZ 302 • Fed from the MRM • Covers Sale and part of Altrincham • Approximately 16000 props • Fed via two trunk mains – 12” CICL – 18” CI

Lessons learnt • Leakage does change • Monitor benefits over “reasonably” long period of time • Daily input and Nightlines • Burst frequency