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Our Experience in Reducing Water Losses by Regulating Pressure in Water Supply Systems. Prof. Dr. Dipl .- E ng . Gancho Dimitrov Head of Department: Water Supply, Sewage and Purification of Water at at the University of Architecture, Civil Engineering and Geodesy, Sofia, Bulgaria.

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our experience in reducing water losses by regulating pressure in water supply systems

Our Experience in Reducing Water Losses by Regulating Pressure in Water Supply Systems

Prof. Dr. Dipl.-Eng. GanchoDimitrov

Head of Department: Water Supply, Sewage and Purification of Water at at the University of Architecture, Civil Engineering and Geodesy,

Sofia, Bulgaria

November 2011, Dubai, UAE

pressure reduction

Pressure Reduction

  • the reduction of water loss and water consumption
  • the reduction of the accident rate
  • abolition of restrictions on traffic in the streets
  • the reduction of operating costs
  • the substantial reduction in investment
  • the removal of less amounts of water from the water sources
  • providing the necessary ecological balance of ecosystems

In our experience pressure control in water supply networks is an effective measure for :

types of pressure control and our research results
Types of pressure control, and our research results
  • By maintaining constant pressure after the control valve
  • By maintaining constant pressure after the control valve through water consumption or for specific periods of time;
  • Maintaining a minimum pressure through the critical point of the water supply network.
  • individual zones in 45 residences, 120 control valves
  • reduction of water losses from 15% to 50% of the average water consumption
  • success in reducing accidents by 50% to 90%
case studies pressure management

Case Studies: Pressure Management

  • Total length of water network: 38 127 m
  • House connections:1 327
  • Number of people: 23 209
  • Maximum pressure: 9.1 bar
  • Pressure regulator: DN 300
  • Output pressure: 5 bar

DMA 1, 2009

slide5

Results

Fig.1 Change in water consumption at the beginning of the zone

b) period from 14-22 June after adjusting pressure.

a) period from 12-19 January 2007 before installing the pressure valve;

dma 2 2007

Case Studies: Pressure Management

  • Total length of water network: 75 834 m
  • House connections: 6 550
  • Number of people: 27 400
  • Pressure regulator: DN 600
  • Outlet pressure by night: 3,5 bar
  • Outlet pressure by day: 5,0 bar

DMA 2, 2007

slide7

Results

Fig. 2 Change in water consumption at the beginning of the zone for the period from 10-15 August 2007

Fig. 3 Change in water pressure at the beginning of the zone for the period from 10-15 August 2007

slide8

Results

Fig. 4 shaft with valves and pressure reducing valve with a diameter of DN 600 with two operation modes (with 5 bar pressure and 3,5 bar)

Effect:

  • Reduction:
  • Water losses by 20%
  • Number of accidents by 75%
  • Investment recovery period –
  • 1 year
case studies pressure management9

Case Studies: Pressure Management

  • Total length of water mains: 104 818 m
  • Number of people: 100 000
  • Pressure regulators: DN 600 and DN 400
  • Input pressure: 4,7 bar
  • Output pressure: 3,7 bar

DMA 3, 2010

slide10

Results

Fig. 5

Installation - Main control valve with DN600 with a bypass line

Effects

  • Reduction:
  • Water loss reduction 1,2 mln m3/ per year
  • Number of accidents by 50%
  • Investment recovery period - 1 year
conclusions

CONCLUSIONS

  • Pressure control is a relatively efficient way to reduce water losses and especially the number of accidents.
  • Investment recovery period for pressure regulating is very short (from a few months to 1 year).
  • Reduction of water losses by pressure control has a multiplier effect. It reduces operational costs and investments for new pipelines, pumping stations, treatment plants, and natural wastewater.
slide12

Thank you for your attention!

for questions and contact:

Prof. Dr. Dipl.-Eng. GantchoDimitrov

E-Mail: info@wato.bg

Mobile: +359 888 305525

Web: www.WATO.bg