the presentation

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WATER LOSS 2010
SAO PAULO, BRAZIL
JUNE 6 TO 9, 2010
PAPER TITLE: CASE STUDY – SYABAS
NRW LOSSES REDUCTION MASTER PLAN
By
Ir. V SUBRAMANIAM
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SUPPLY AREA AND STATUS OF WATER SUPPLY
State of Selangor and Federal
Territories of Kuala Lumpur and
PutraJaya
• Land Area
km
: 8,250 sq
• Population Served: 6.9 million
• 24 hour supply (100% service
coverage in urban areas and
99% service coverage in suburban areas)
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PRIVATISATION PROCESS
All Headworks
privatised from
1994 to 2000
SELANGOR WATER SUPPLY
DEPARTMENT (GOVERNMENT)
CORPORATISED
ON 15TH MARCH 2002
SELANGOR WATER MANAGEMENT
CORPORATION ( PUAS BERHAD )
PRIVATISED
ON 1ST JANUARY 2005
SELANGOR WATER SUPPLY COMPANY PRIVATE
LTD ( SYABAS )
( 30-year Concession Period
- 01.10.2005 to 31.12.2034 )
RESPONSIBILITY OF CONCESSION
COMPANIES
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TREATED WATER
CHANNELLED TO
BALANCING
RESERVOIR
RAW WATER
CHANNELLED TO
INTAKE
DAM
TREATMENT PLANT
TO ENSURE
SUFFICIENT RAW
WATER AT ALL TIMES
FLOCCULATION, COAGULATION &
CHEMICAL DOSING TO PRODUCE
TREATED WATER
BALANCING RESERVOIR
WATER STORED BEFORE
DISTRIBUTION
RESPONSIBILITY OF SYABAS
BULK
METE
R
WATER
DISTRIBUTED AT
SPECIFIED
PRESSURE
WATER
DISTRIBUTED TO
CONSUMERS
SERVICE RESERVOIR
PUMP HOUSE
WATER STORED BEFORE
DISTRIBUTION
BOOST PRESSURE BEFORE
DISTRBUTION
SYABAS OPERATING REGIME/
REGULATORY FRAMEWORK
State
Government
Federal
Government
Privatisation
Concession Agreement
PNSB
ABASS
Ministry of Energy,
Green Technology
and Water
Water Services Industry Act
(WSIA) 2006 & National
Water Services Commission
Act 2006
WTP Operators
SPLASH
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Partial Novation
Agreement to
SYABAS
SYABAS
PNHB : 70%
KDEB : 30%
FEDERAL
GOVT : 1 Golden
Share
Services & Operation
Consumers in
Selangor, KL &
Putrajaya
National
Water Services
Commission
(Regulator)
Chief Executive Officer
Existing staff
100%
PUAS
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OPERATIONAL PERFORMANCE HIGHLIGHTS
•
Distribute treated water to 6.9 million consumers
including factories and commercial buildings in
Selangor, Kuala Lumpur & Putrajaya.
•
Present Consumer Connections is 1.66 million an
average increase of 2.5% p.a. from 1.48 million
recorded in year 2005, comprising 85% domestic
connections and 15% industrial and commercial
connections.
•
Current water demand is 4,064 MLD with an
average growth of 2.0% p.a. over the last 5 years.
•
30.5% supplies for industrial and commercial
consumption and 69.5% supplies for domestic and
other purposes.
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ASSET - DISTRIBUTION
•
SYABAS maintains 25,060km of water pipes
made of mild steel, ductile iron, asbestos cement,
HDPE, uPVC and cast iron of sizes ranging from
2200mm to 100mm in diameter.
•
1240 service reservoirs, balancing reservoirs,
elevated tanks and suction tanks.
•
451 booster pumping stations.
•
53,878 in-line valves of various types and sizes
ranging from 120mm to 2200mm.
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WATER LOSS COMPONENT
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NRW Calculation
NRW is widely measured in percentage (%) as shown below:
NRW(%) =
Qin - Qmetered
x (100)
Qin
Where as:
Qin
= Volume of water supplied within a specific period
Qmetered = Volume of water billed to consumers during the
corresponding period
At SYABAS, International Water Association (IWA) formula
also used to compute NRW in term of ILI (Infrastructure
Leakage Index) and ALI (Apparent Losses Index) as
Performance Indicator for the purpose of analysis.
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MAIN CAUSES FOR HIGH NRW LOSSES
•
About 6,300 km of old Asbestos Cement pipes more than
40 years old susceptible to frequent bursts and leaks;
•
Recurring failure at reticulation mains and communication
pipes even in new development areas due to poor
material and workmanship;
•
Inefficient call centre to receive and record reported pipe
leaks/bursts or overflows;
•
Slow response to reported cases and unnecessary delay
during repair and maintenance works;
•
Lack of community programmes to encourage and create
the public awareness to value water and to report
promptly pipe bursts and leaks;
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MAIN CAUSES FOR HIGH NRW LOSSES (cont.)
•
Inaccurate, incomplete or no records of pipe
interconnectivity in many areas rendering the isolation
process very tedious to facilitate quick repair especially
during major pipe bursts;
•
Lack of discipline in meter readings leading to high
level of estimated bills, reading errors and fraudulent
practice;
•
Very limited enforcement against illegal connections;
•
More than 300,000 aged meters of more than 7 years
old with some even older than 18 years contributing to
significant meter under-registration;
•
Large number of non-working or stuck meters.
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NRW MASTER PLAN
NRW MASTER PLAN
Commercial Loss Reduction
Physical Loss Reduction
Meter Replacement
-Age Meters of 7 years & above
-Stuck Meters
NRW REDUCTION
Date
Installation of AMR
enabled EM flow meters
at large account
Enforcement against
illegal connections
Upgrading of meter reading
& billing process
Target NRW Level
31-12-05
37.78%
31-12-08
27.98%
31-12-11
19.98%
31-12-14
15.48%
31-12-15
and thereafter
15.00%
District Metering Zone
( DMZ ) 1,000 zones by
end of 2013
Pressure Management Zone
( PMZ )
Monitoring of Reservoir
Overflow through SCADA
Pipe Replacement
- Mains (6,000 km) by end of CA
- Comm Pipe (1Million nos) by
end of CA
Active Leak Detection
(trunk & reticulation mains)
Quick & Quality repair of
leak /burst
Supporting Programs
PUSPEL
Development of Water Distribution
& Management System (WDMS)
SCADA & GIS
Training & capacity building
Hydraulic Modeling
Design and specifications for water
infrastructure in New Developments
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DISTRICT
METERING ZONE (DMZ)
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DISTRICT METERING ZONE (DMZ)
•
Total DMZ established as end of 2009 are as follows:
Year
DMZ established
(nos.)
Reduction in DMZ
volume (mld)
2005
222
114.00
2006
139
68.38
2007
43
29.55
2008
318
104.45
2009
251
78.22
Total
973
394.60
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DMZ ZONE PLAN
DMZ METER POINT
DMZ BOUNDARY ZONE
Typical size of DMZ : 1,000 to 1,500 connections or 10km pipe length
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DMZ METERPOINT CHAMBER
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INSTRUMENT INSIDE METERPOINT
Pressure
Reducing
Valves
Meter
T- pot
Strainer
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GSM DATA LOGGER – TO LOG AND RECORD FLOW AND PRESSURE
PROFILE
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DMZ GB.082 Kg Baru Ampang
Group Comprising: GB.082 - Kg Baru Ampang [Net flow], PRV.GB.082 - Kg Baru Ampang [Downstream], Produced by Netbase.
200
34
190
32
180
170
30
160
28
150
26
Pressure Reduction
140
24
130
22
20
110
18
100
90
16
80
14
70
12
60
10
50
8
40
Baseline 1
30
Maximum Pressure = 34mH
20
Total Daily Flow = 5,364 m3/day
10
Minimum Night Flow = 51.9 l/s
leaks found and repaired
0
10/12/09
Thu
11/12/09
Fri
12/12/09
Sat
13/12/09
Sun
14/12/09
Mon
15/12/09
Tue
16/12/09
Wed
17/12/09
Thu
18/12/09
Fri
19/12/09
Sat
20/12/09
Sun
21/12/09
Mon
22/12/09
Tue
23/12/09
Wed
24/12/09
Thu
Baseline 2
6
Maximum Pressure = 22mH
4
Total Daily Flow = 5,015 m3/day
2
Minimum
Night Flow = 43.2 l/s
26/12/09 27/12/09 28/12/09 29/12/09
25/12/09
Fri
Sat
Sun
Mon
Reduction in physical loss of 349 m3/day
Tue
0
30/12/09
Wed
31/12/09
Thu
01/01/10
Fri
02/01/10
Sat
Pressure : (m)
Flow : (l/s)
120
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PRESSURE MANAGEMENT
ZONE (PMZ)
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PRESSURE MANAGEMENT ZONE (PMZ)
• Similar to DMZ but in smaller scale encompassing
250 to 500 connections or 5 km of pipe length.
• Primarily for reducing pipe burst frequency.
• Critical areas not economically viable to set up
DMZ
• Reduction of OPEX in term of burst repair.
• Contribution to leakage savings although not as
much as DMZ
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Initial Pressure = 38 mH (red profile)
800
40
38
750
36
700
34
650
32
600
30
28
550
26
500
22
400
20
18
350
16
300
250
14
Capped Pressure = 15 mH (red profile)
12
200
Capped Pressure = 15 mH (red profile)
150
10
8
6
100
4
50
2
0
17/11/09
Tue
0
18/11/09
Wed
19/11/09
Thu
20/11/09
Fri
21/11/09
Sat
22/11/09
Sun
23/11/09
Mon
24/11/09
Tue
25/11/09
Wed
26/11/09
Thu
Pressure Management Zone at Rawang Tin
27/11/09
Fri
28/11/09
Sat
29/11/09
Sun
30/11/09
Mon
Pressure : (m)
Flow : (m³/d)
24
450
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FURTHER REDUCTION
USING TIMER AND FLOW
MODULATOR AT PRV
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Further Reduction Using Timer and Flow Modulator at PRV
•
During night time, pressure increases due to low demand
leading to higher background leakage.
•
Electronic devices installed at selected DMZ/PMZ to further
control Minimum Night Flow (MNF).
1)
Timer
- Common technique.
- Can be programmed between day and night.
2)
Flow modulator
- More sophisticated.
- Regulate the downstream pressure based on
demand flow into DMZ/PMZ.
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Pressure is maximum at
low flow during night time.
MNF without flow
modulator
Pressure is propotional reduce
accordance to low flow
demand
Reduction in MNF with flow
modulator
Flow and Pressure profile for DMZ installed with flow modulator at PRV
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29
14.5
28
14
25
13.5
27
13.5
24
13
26
13
23
12.5
25
12.5
22
12
24
12
21
23
11.5
20
22
11
21
10.5
20
10
11.5
11
10.5
19
10
18
9.5
18
9
16
8.5
17
8.5
15
8
16
8
14
7.5
15
7.5
13
7
14
7
12
6.5
13
6.5
6
11
6
12
5.5
10
5.5
11
10
5
9
9
4.5
8
8
4
7
7
3.5
6
6
3
5
2.5
4
2
3
1.5
2
1
23/01/09
Fri
24/01/09
Sat
25/01/09
Sun
26/01/09
Mon
27/01/09
Tue
28/01/09
Wed
9
5
4.5
4
3.5
3
5
2.5
4
2
3
1.5
1
2
1
0.5
1
0
0
22/01/09
Thu
Flow : (l/s)
9.5
29/01/09
Thu
0.5
0
30/01/09
Fri
0
31/01/09
Sat
01/02/09
Sun
02/02/09
Mon
03/02/09
Tue
04/02/09
Wed
05/02/09
Thu
DMZ profile without flow modulator.
DMZ profile with flow modulator
Average TDF = 1,650m3/day
Average TDF = 1,356 m3/day
Further reduction in background leakage = 294 m3/day
06/02/09
Fri
Pressure : (m)
19
17
Pressure : (m)
Flow : (l/s)
Comparison profile of flow and pressure after flow modulator installation
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ACTIVE LEAK DETECTION (ALD)
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ACTIVE LEAK DETECTION (ALD)
• Conducted during night time between 2.00am to
4.00am when pressure is high and leak noise could be
heard and detected easily.
• Mechanical listening stick and electronic leak noise
correlator are used to locate invisible leaks.
• Apart from trunk and reticulation mains, ALD is also
carried out to detect leak or burst within DMZ/PMZ with
increasing Total Daily Flow (TDF) and Minimum Night
Flow (MNF).
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Sounding at meter stand
Leak sounding at communication pipe
Visual and sounding activities to detect leak at communication pipe
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Leak sounding activities was carried out during period
from 2.00am to 4.00am
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RESERVOIR LEVEL AND
OVERFLOW MONITORING
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RESERVOIR LEVEL AND OVERFLOW MONITORING
• More than 1,200 reservoirs within SYABAS.
• Depth transducers and sensor loggers installed at
major reservoirs .
• SCADA system also being developed to monitor
reservoir level and pumping operation.
• Operation Command Centre on 24 x 7.
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Overflow detected
Suspected Overflow from 4:30am to 7:00am
Reservoir overflow profile
Period of overflow between
4.00am to 7.00am
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SCADA System at Command Centre
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Other Major NRW Reduction Programmes Implemented
• 812 km AC mains replaced.
• 39,000 communication pipes replaced
• 329 reservoir inlet control valves repaired/replaced.
• 730,000 aged and stuck consumer meters replaced.
• 450 EM flow meters installed for large industrial
consumers.
• 15,600 cases of reported illegal connections
investigated and enforcement action taken on 2,290
cases.
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24 x 7 CUSTOMER SERVICE and TOLL FREE CALL CENTRE
Lucky Draw Prize Giving Ceremony
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QUICK AND QUALITY PIPE BURST AND LEAK RESPONSE
Average time taken to respond and repair pipe bursts under SYABAS:
Size
(inch)
Maximum
(hrs)
Minimum
(hrs)
Average
(hrs)
4
12.00
1.50
4.50
6
11.50
1.25
5.00
8
8.50
1.00
5.25
10
9.50
3.50
5.50
12
8.00
4.00
5.50
18
12.00
6.00
8.00
RESULTS AND ACHIEVEMENT
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Legend:
WL = Water Loses
Ave P = Average Pressure
CARL = Current Annual Real Losses
UARL = Unavoidable Annual Real Losses
UAC = Unbilled Authorized Consumption
Dsty = Density (connection per km)
ILI = Infrastructure Leakage Index (Physical Losses)
(Ratio of CARL to UARL)
ALI = Apparent Losses Index (Apparent Losses)
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NRW REDUCTION PERFORMANCE (JAN 2005 TILL 30 APRIL 2010)
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THANK YOU