Bojan Ristovski P.E. “Water Supply and Sewerage” – · PDF fileBojan...
Transcript of Bojan Ristovski P.E. “Water Supply and Sewerage” – · PDF fileBojan...
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” – SkopjeQuality Management Representative
Director of Leak Detection Department,
On-Duty Center and Call Center
Company data
Established in 1907 Number of employees: 1150Population served: 550000Annual water input: around 100 millions m3
Number of consumers:185000 households, 4000 industrial, 12000 small business
Price of water; Industry / Household: 1,069 € / 0,477 €24 hours/day, 365 days/year continuous supply Water sources:
Rasce Spring capacity avg. 4.7 m³/sNerezi and LepenecWells 7 / 1420 l/s
Length of Mains without CP: 960 km (68 % cast iron)Diameter of Mains: ø50mm ‐ ø1.600 mmISO and HACCP certificated by SGS
(we have celebrated our Centenary)
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Supplied Water
Billed Water
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Supplied and billed water for the period 1946 - 2008
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
Water sources, main pipes and PSt.
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
Before VSDP project implementation
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.
Variable Speed Drive Regulation
A
Energy Usagenn
100%
Nominal pressure
P ~ Q x H
Nominal flowFlow (Q)
Pressure(H)
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nn
70% 100%
Nominal pressure
n1< nn
Flow (Q)
Pressure (H)
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Variable Speed Drive Regulation
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nn
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Energy Usage
Flow(Q)
Pressure(H)
Δp
Variable Speed Drive Regulation
After VSDP project implementation
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
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
Cl. St. Kondovo
P. St. Rasce 2.
Skopje – Low Pressure Zone Case
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 :
‐ held on the target pressure in Cl. St. Kondovo, until there is enough water in theCapping
VSPs of 75 HP
Const of 75 HP
Control node J-29 Kondovo
• Skeleton system
• 310 Ml/day
• Energy cost: 36 k Euro/year
• Recorded daily energy cost: 100 Euro
• Modeled daily energy cost: 108 Euro
Current situationThe 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
Expected water loss and energy savings
Possibility to run VDSP on minimal frequency (35 Hz, or 70%)
Minimum water savings of around 4600 m3 /day, or 1.7 million m3 /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
Lisiche
Implemented strategies:PRM and ALC
Layout of water supply system of city of SkopjeCase Study-DMA Lisiche
DMA 500-Lisice
Number of households:4150Number of water meters:4639Total length of pipes: 33 kmNumber of connections:3450Without buildings, only houses
Phase 1Pressure Reduction Management
Sub DMA 501
Sub DMA 502
Sub DMA 503
DMA 500-Lisice
Calculated nodal pressures in the DMA Lisice before and after installation of PRV
Before installation of PRV
After installation of PRV
Flow meter and PRV chamber
Electromagnetic battery operated flow meter DN 200PRV DN 200Battery powered PRV controllerRemote data monitoring (GSM)
Average before PRM28.50 l/s Average after PRM
21.40 l/sAfter add. setting of PRM
18.90 l/s
No control Flow modulation
Pressure measurement point
/Period(30.03‐03.04.2010)
Max.(bar)
Min.(bar)
Avg.(bar)
Gornovranovska 24 4.745 1.441 3.139
Todor Cangov 22/14 4.784 1.578 3.197
Lisec 37 4.657 1.951 3.315
Todor Cangov 21/12 5.431 2.520 3.959
Dimitar Makedonski(Morski) 4.745 3.127 3.899
Pressure measurement point
/Period(05.05‐07.05.2010)
Max.(bar)
Min. um(bar)
Avg.(bar)
Gornovranovska 24 2.824 1.255 1.982
Todor Cangov 22/14 2.647 1.637 2.203
Lisec 37 2.696 1.716 2.144
Todor Cangov 21/12 3.294 2.235 2.830
Dimitar Makedonski(Morski) 3.431 1.745 2.606
Pressure data before PRM Pressure data after PRM
MNF measurementsMNF data before PRV MNF data after PRV
avg, MNF(l/s)
avg MNF(m3/h)
sub DMA 501 16.09 57.92
sub DMA 502 8.11 29.2
sub DMA 503 4.30 15.48
DMA 500 28.50 102.6
avg, MNF(l/s)
avg MNF(m3/h)
sub DMA 501 10.62 38.23
sub DMA 502 5.70 20.52
sub DMA 503 2.48 8.93
DMA 500 18.90 68.04
avg, MNF(l/s)
avg MNF(m3/h) % of MNF
Approx. Daily savings (m3)
DMA 500 9.60 34.56 33.68 884.39
Calculated NDF for DMA 500‐Lisiche: 25.59
Phase 2Active Leakage Control
Water loss methodologyDMA Design
Network modeling
On Site Measurement of Pressure and Flow
Analyze the DataAZNP and MNF
Visual inspection of Water and Sewerage
System, On Site Survey for Illegal
Connections
Acoustic Sounding Survey
Leak Location
Repair,Analyze Detection
Activities Effectiveness
Detected leakage nodes using the Darwin Calibrator
Detected leakage nodes in the DMA, considering the generated Emitter coefficient, using the Darwin Calibrator
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Pressure inlet, pressure outlet, DMA - Lisice
Line StatisticMean
Site NameLisiceLisiceLisice
MeasurandOutletInletFlow
Unitsbar {m}bar {m}l/s {cum/hr}
Average after ALC 17.65 l/s
Results obtainedDMA 500 Lisice avg, MNF (l/s) avg MNF
(m3/h)
Before project implementation 28.50 102.6
After PRM 18.90 68.04
After ALC 17.65 63.54
DMA 500Lisiche
avg, MNF(l/s)
avg MNF(m3/h)
Approx. Daily savings (m3)
Total Savings 10.85 39.06 999.55
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.
1400 water meters (around 30 % of all ) have been replaced with new one C class with AMR
THANK YOU
Bojan RistovskiP.E. Water Supply and Sewerage‐Skopje
e‐mail: bojan.ristovski@vodovod‐skopje.com.mk