Assessing Water Loss in Plastic Pipes In Water Distribution ...Assessing Water Loss in Plastic Pipes...
Transcript of Assessing Water Loss in Plastic Pipes In Water Distribution ...Assessing Water Loss in Plastic Pipes...
Assessing Water Loss in Plastic Pipes In Water
Distribution & Transmission Systems
Tuesday, December 5, 2017 at 7:35AM PDT
Carissa Boudwin, Dir. Marketing, Electro Scan Inc., [email protected]
BOOTH #502
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Agenda
1. Plastic Pipes & Acoustic Sensors
2. What is Low Voltage Conductivity?
3. Manuals & Standards
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Low Voltage Conductivity
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Leaks In Plastic Pipes
1. PVC & HDPE
2. Acoustic Sensors in Plastic Pipes
1
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PVC
PVC
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HDPE
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Good Fusion Joint – Fully Acceptable
Melt Out Unacceptable – Possible Causes: Pipe Ovality, Flat Spots,
Undersized Pipe and Binding
HDPE
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“Tried-and-True” Method
External AcousticSounding
Listeners
Correlators
Leak Loggers
Permanent Leak Detection
Non-AcousticGas Tracer
GPR
Themography
Satellite
Low-Voltage Conductivity
Typical Frequency Ranges
• Human male voice 125 – 2000 Hz
• Human female voice 250 – 5000 Hz
• Fran Drescher’s Voice 5000 - 7000Hz
• Typical 6” cast iron pipe 200 – 800 Hz
• Typical 6” PVC pipe 5 – 30 Hz
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Sound Velocity Travels at Different Rates When Water is Under Pressure, Depending on Pipe Material and Size
How Far Can General Distance Sounds
Travel? 2 GPM Leak at 60 PSI
PVC and HDPE
Acoustic Inspection
• Takes Much Longer to Complete.
• Multiple trials at different filter settings to
dial in the most accurate setting.
• Plastic pipe frequencies are extremely
low and in a narrow band.
• Cost can be higher with plastic than iron
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Low Voltage Conductivity
1. How Does Low Voltage
Conductivity Work?
2. Results
2
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Low Voltage Conductivity
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WRONG DISTANCE
RIG
HT
DIS
TAN
CE
RIGHT DISTANCE
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“If a Pipe Leaks Electricity,It Leaks Water.”
- Elementary Geophysics
E
I R
Ohm's LawE = IR ; I = E/R ; R = E/I
Where:“E” volts“I” amps“R” ohms
Torricelli’s Law
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Electro Scan’s Tri-Electrode Array in a Water Main.
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Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Low Voltage Conductivity
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Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Low VoltageByPipeMaterial
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Low Voltage Conductivity
Standards & Manuals
1. AWWA M77
2. ASTM
3. O&M Manual
3
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AWWA M77
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c. Low Voltage Conductivity method
AWWA M77
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