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

£0 £5,000,000 £10,000,000 £15,000,000 £20,000,000 £25,000,000 £30,000,000 £35,000,000 2010/11 2011/12 2012/13 Capex- Inf Capex-Non Inf Opex Total

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 Year Active leak detection Leak repair Total 2012‐13 £7,001,760 £7,999,361 £15,001,121 2011‐12 £7,460,985 £7,142,379 £14,603,364 2010‐11 £8,772,037 £16,521,899 £25,293,936

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