assessing water loss in plastic pipes in water distribution ...assessing water loss in plastic pipes...
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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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Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
Agenda
1. Plastic Pipes & Acoustic Sensors
2. What is Low Voltage Conductivity?
3. Manuals & Standards
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Electro Scan Inc. | Copyright © 2017. All Rights Reserved.
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
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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
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External AcousticSounding
Listeners
Correlators
Leak Loggers
Permanent Leak Detection
Non-AcousticGas Tracer
GPR
Themography
Satellite
Low-Voltage Conductivity
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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
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How Far Can General Distance Sounds
Travel? 2 GPM Leak at 60 PSI
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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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Low Voltage Conductivity
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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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