Assessing Water Loss in Plastic Pipes In Water Distribution ...Assessing Water Loss in Plastic Pipes In Water Distribution & Transmission Systems Tuesday, December 5, 2017 at 7:35AM

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

Electro Scan Inc. | Copyright © 2017. All Rights Reserved.

Agenda

1. Plastic Pipes & Acoustic Sensors

2. What is Low Voltage Conductivity?

3. Manuals & Standards


Low Voltage Conductivity


Leaks In Plastic Pipes

1. PVC & HDPE

2. Acoustic Sensors in Plastic Pipes

1


PVC

PVC


HDPE


Good Fusion Joint – Fully Acceptable

Melt Out Unacceptable – Possible Causes: Pipe Ovality, Flat Spots,

Undersized Pipe and Binding

HDPE


“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


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



1. How Does Low Voltage

Conductivity Work?

2. Results

2




WRONG DISTANCE

RIG

HT

DIS

TAN

CE

RIGHT DISTANCE


“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






Electro Scan’s Tri-Electrode Array in a Water Main.

















Low VoltageByPipeMaterial



Standards & Manuals

1. AWWA M77

2. ASTM

3. O&M Manual

3


AWWA M77


c. Low Voltage Conductivity method

AWWA M77



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Assessing Water Loss in Plastic Pipes In Water Distribution ...Assessing Water Loss in Plastic Pipes In Water Distribution & Transmission Systems Tuesday, December 5, 2017 at 7:35AM