(we have celebrated our Centenary) Established in 1907

Transcription

1 EXPERIANCES GAINED AND RESULTS ACCHIEVED THROUGH VARIABLE SPEED DRIVE PUMP IN THE LOWER PRESSURE ZONE AND ACTIVE LEAKAGE CONTROL AND PRESSURE MANAGEMENT IN PARTICULAR DMA IN THE CITY OF SKOPJE, MACEDONIA Bojan Ristovski P.E. Water Supply and Sewerage Skopje Quality Management Representative Director of Leak Detection Department, On-Duty Center and Call Center

2 Company data Established in 1907 (we have celebrated our Centenary) Number of employees: 1150 Population served: Annual water input: around 100 millions m 3 Number of consumers: households, 4000 industrial, small business Price of water; Industry / Household: 1,069 / 0, hours/day, 365 days/year continuous supply Water sources: Rasce Spring capacity avg. 4.7 m³/s Nerezi and Lepenec Wells 7 / 1420 l/s Length of Mains without CP: 960 km (68 % cast iron) Diameter of Mains: ø50mm ø1.600 mm ISO and HACCP certificated by SGS

3 Supplied Water 80 Billed Water Supplied and billed water for the period Millions m 3 /year Year

4 Strategy for water loss reduction Addresses the causes for those losses Suggests recommendation for reducing the real losses Suggests recommendation for reducing the apparent losses

5 Water sources, main pipes and PSt. Before VSDP project implementation Two constant speed pumps of 75 kw (500 l/s) take hold of water from capping Rasce 2 and pump it to the pipe of 1600 mm and Chlorination St. Kondovo One pump is always running with full capacity as well during the night hours Second pump is ON when there is enough water in the capping and when the pressure in Cl. St. Kondovo is below target The communication between operators in PSt Rasce 2 and Cl. St. Kondovo is perform through voice radio The operator in Cl. St. Kondovo monitor the pressure, and based on it level, issue a radio voice command to switch OF or ON the second pump in PSt Rasce 2

6 System management and costs are highly depended of the skills of operators and their engagement. When the target pressure in Cl. St. Kondovo is grater than optimal, water loss is increased. During the night hours, the system is feed with exceed quantity of water and therefore, the pressure during the night is exceed too.

7 Variable Speed Drive Regulation Pressure(H) Nominal pressure P ~Q x H A Energy Usage n n 100% Nominal flow Flow (Q)

8 Variable Speed Drive Regulation Pressure (H) Nominal pressure A n n C n 1 < n n 70% 100% Flow (Q)

9 Variable Speed Drive Regulation Pressure(H) Δp Energy Saved A n n C Energy Usage n 1 < n n 70% 100% Flow(Q)

10 After VSDP project implementation P. St. Rasce 2. Installation of a VSD and a soft starter with two line switch (working and backup pump) Installation of water level and water overflow level transmitter in the Capping Rasce 2 Cl. St. Kondovo Installation of PLC devices in P.St, Rasce 2 and Cl.St. Kondovo for system management and GPRS communications between them Installation of HMI Touch panel in P.St, Rasce 2 and Cl.St. Kondovo for system control and setting parameters Designed and implemented a complex algorithm management system

11 Skopje Low Pressure Zone Case Skeleton system Const of 75 HP VSPs of 75 HP Control node J- 29 Kondovo PLC on PS Rasce 2 automatically changes speed pump, which is controlled by frequency regulator and when needed, turn OFF/ON the second pump managed by the soft starter in order to : 310 Ml/day Energy cost: 36 k Euro/year Recorded daily energy cost: 100 Euro Modeled daily energy cost: 108 Euro held on the target pressure in Cl. St. Kondovo, until there is enough water in the Capping

12 Current situation The current hydrological situation is such that the water source Rasce is plentiful There is no need the to run the PS Rasce 2 Capping Rasce 1 Inflow in the main 1600 mm pipe by gravity

13 Expected water loss and energy savings Possibility to run VDSP on minimal frequency (35 Hz, or 70%) Minimum water savings of around 4600 m 3 /day, or 1.7 million m 3 /year. Power consumption will be around 35 % of that if the pump works at 100 % speed, which means savings of around 40 kwh per hour Maximize the use of the supply via gravity source Ensure safe and efficient water supply Optimal control of PS Rasce 2 Energy efficient pump operation leads low carbon footprint

14 Layout of Case water Study-DMA supply system Lisiche of city of Skopje Lisiche Implemented strategies: PRM and ALC

15 DMA 500-Lisice Number of households:4150 Number of water meters:4639 Total length of pipes: 33 km Number of connections:3450 Without buildings, only houses

16 Phase 1 Pressure Reduction Management

17 DMA 500-Lisice Sub DMA 502 Sub DMA 501 Sub DMA 503

18 Calculated nodal pressures in the DMA Lisice before and after installation of PRV Before installation of PRV After installation of PRV

19 Flow meter and PRV chamber Electromagnetic battery operated flow meter DN 200 PRV DN 200 Battery powered PRV controller Remote data monitoring (GSM)

20 No control Flow modulation Average before PRM l/s Average after PRM l/s After add. setting of PRM l/s

21 Pressure data before PRM Pressure data after PRM Pressure measurement point /Period ( ) Max. (bar) Min. (bar) Avg. (bar) Gornovranovska Todor Cangov 22/ Lisec Todor Cangov 21/ Dimitar Makedonski (Morski) Pressure measurement point /Period ( ) Max. (bar) Min. um (bar) Avg. (bar) Gornovranovska Todor Cangov 22/ Lisec Todor Cangov 21/ Dimitar Makedonski (Morski)

22 MNF measurements MNF data before PRV avg, MNF (l/s) avg MNF (m 3 /h) sub DMA sub DMA sub DMA DMA MNF data after PRV avg, MNF (l/s) avg MNF (m 3 /h) sub DMA sub DMA sub DMA DMA Calculated NDF for DMA 500 Lisiche: avg, MNF (l/s) avg MNF (m 3 /h) % of MNF Approx. Daily savings (m 3 ) DMA

23 Phase 2 Active Leakage Control

24 Water loss methodology DMA Design Network modeling Repair, Analyze Detection Activities Effectiveness On Site Measurement of Pressure and Flow Leak Location Analyze the Data AZNP and MNF Acoustic Sounding Survey Visual inspection of Water and Sewerage System, On Site Survey for Illegal Connections

25 Detected leakage nodes using the Darwin Calibrator Detected leakage nodes in the DMA, considering the generated Emitter coefficient, using the Darwin Calibrator

26 Pressure inlet, pressure outlet, DMA - Lisice bar 8.0 Line Statistic Mean Site Name Lisice Lisice Lisice Measurand Outlet Inlet Flow Units bar {m} bar {m} l/s {cum/hr} l/s Average after ALC l/s :00 18:00 00:00 06:00 12:00 18:00 00:00 06:00 12:00 18:00 00:00 06:00 12:00 18:00 00:00 06:00 12:00 18:00 00:00 06:00 12:00 Mon 17 May :00 (hour:min) 10

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28 Results obtained DMA 500 Lisice avg, MNF (l/s) avg MNF (m 3 /h) Before project implementation After PRM After ALC DMA 500 Lisiche avg, MNF (l/s) avg MNF (m 3 /h) Approx. Daily savings (m 3 ) Total Savings We are expecting additional decreasing of water loss in DMA Lisice through replacement programme (existing galvanized pipes with ductile iron pipes as main pipes and existing galvanized house connections with PE). Almost 3500 m in subdma 502 and 3000 m in subdma 503 of ductile iron pipes have been already installed, as well as PE house connections. We are currently connecting the new PE connection pipes with the water meters and internal pipes, and excluding the old pipes from the network water meters (around 30 % of all ) have been replaced with new one C class with AMR

29 THANK YOU Bojan Ristovski P.E. Water Supply and Sewerage Skopje e mail: bojan.ristovski@vodovod skopje.com.mk