Transmission Main Leak Detection and Condition Assessment:

Transmission Main Leak Detection and Condition Assessment: Transmission Main Leak Detection and Condition Assessment: - Start

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Transmission Main Leak Detection and Condition Assessment: - Description

Brazil . Trade Mission 2012. Corporate Overview. Formed in 2003.. Based in Toronto.. Original . focus was on . correlation based Leak . Detection Equipment, specifically for PVC.. Developed Non Destructive pipe condition assessment technology. ID: 137581 Download Presentation

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Transmission Main Leak Detection and Condition Assessment:




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Presentations text content in Transmission Main Leak Detection and Condition Assessment:

Slide1

Transmission Main Leak Detection and Condition Assessment:

Brazil

Trade Mission 2012

Slide2

Corporate Overview

Formed in 2003.

Based in Toronto.

Original

focus was on

correlation based Leak

Detection Equipment, specifically for PVC.

Developed Non Destructive pipe condition assessment technology

Changed focus to service offerings:

Leak detection for Large diameter mains

Condition assessment for ferrous and asbestos cement mains

Slide3

Agenda

Correlation Theory Review

Echologics

Key Advantages

Leak Detection Case Studies

Condition Assessment Background

Condition Assessment Case Studies

Summary

Slide4

Correlation Theory

Slide5

Correlation: a Review

Old technology: proven on metallic distribution mains

Manufacturer’s began to work on plastic and other types of pipes: made claims that could not be consistently achieved!

Required a different approach to:

Sensors

Signal Processing

Amplifiers

Echologics achieved some extraordinary success, other manufacturers immediately introduced ‘trunk main

correlators

, but have never achieved our level of success

Development continues; now on our 5

th

generation of hardware

Slide6

Correlation Theory

Leaks make noiseTime of flight technologyCorrelation function:Leak bracketed with 2 SensorsLeak noise takes longer to arrive at Sensor 1 than Sensor 2Correlator measures time difference to identify exact leak location

Slide7

Why is Echologics Successful

Advances in sensor design, signal processing, correlation algorithms

Advances in post processing of data

Advances in field techniques

It is as much about the people, as it is about the equipment

Slide8

Sensor development

We have done extensive R&D into plastic and transmission main sensor requirements, developed both hydrophones and accelerometers for large diameter

The People

We have an intense training program and detailed field / data analysis processes

We have a young, passionate team of engineers

Slide9

Echologics

Correlation

Advantages

Slide10

Advantage and Disadvantages

Advantages:

Easily implemented with existing fittings

No requirement to close service take offs or laterals

No requirement to alter the flow in the pipe

Can ‘see’ leaks many km away; will

find largest leaks first

Will find small leaks (typical results 2 LPM on 1500mm pipe at 3.5 bar, 1100m)

Disadvantages:

Will not find very small leaks (<1LPM)

Accuracy of location needs to be carefully verified

Slide11

Technology Comparison

Technology

Pros

Cons

Traditional Correlation

Non-Intrusive and Non-destructive

Poor performance on PVC and Large Diameter (LD) mains

Echologics Correlation

Same as above

Works on PVC and LD mains

Cost Effective

Cannot find small leaks (<1

lpm

)

‘Averaged’ condition assessment results

In-Pipe

Tethered and Free Swimming

Can find small leaks

Works on long sections of pipe with minimal access

Intrusive

Special Insertion Points are required

Isolation of all laterals is required

Slide12

Leak Detection Case

Studies

Slide13

Case Study: SABESP

Leak discovered by Smart Ball PilotDry hole had been dug based on Smartball locationRequested by Genival Abdias to try and pinpoint the leakEchologics correlated the leak to within <1m accuracy

13

Slide14

Site Location

Slide15

Leak Location Excavation

Slide16

Successful Leak Location

Slide17

Echologics performed a transmission main leak detection pilot survey on 8km of UWNJ transmission mains24” to 42” diameterTesting revealed 5 leaksOne major leak discovered on a pipeline section outside of the boundaries of the original test planWe first saw this leak 3 km from the eventual location

Case Study: United

Water New Jersey

Slide18

Out of Bracket Leak Detected

Correlations provided evidence of leakage outside the current test area

Slide19

Isolated

Leak Under a Stream

Correlation across the river crossing revealing a prominent peak 40m east of fitting on the main

Slide20

UWNJ 42” RCP Repair Pictures

Slide21

Other Examples:

Thames Water, England

Bristol Water, England

Las Vegas Valley Water Department

Springfield, Massachusetts

Echologics

confirmed 2 leaks

that was already discovered by expensive in-pipe technologies - 36

”(915mm) and 48” (1200mm) main

Sydney, Australia

Barrie, Ontario

New Orleans

Slide22

Condition

Assessment Background

Slide23

Remaining Pipe Wall Thickness Measurement

Metallic pipes lose thickness from internal and external corrosion

Asbestos cement pipes lose

effective thickness

from aggressive waters leaching calcium out of cement and weakening walls

Physical wall thickness doesn’t change, but the pipe loses structural stiffness and strength

Slide24

Velocity Measurement

Wave propagation velocity (v) = D/ΔT, where ΔT is time delay between signals 1 and 2

Noise Source

Measure the sound velocity

Slide25

Minimum1 Average2 Wall Thickness

Minimum around the circumference

Averaged along the length

Slide26

Las Vegas, NV: LVVWD Pilot

Two sections of 6

AC pipe tested

.73” remaining structural thickness was measured by Echologics

Results indicated that pipe met requirements of PC200

Excavated pipe to confirm results

Testing confirmed that our results accurately represented the remaining structural thickness of the pipe

Slide27

Las Vegas: Velocity Measurement & Results

Slide28

Las Vegas, NV: Excavated Pipe

Slide29

Results of 14” lab testing

Slide30

White area has lost structural integrity

Pink area represents structurally sound concrete

Slide31

Newark, NJ: Pilot on cast iron pipe

Pilot study on cast iron pipe installed in 1910

Pipe had been chosen for cement mortar lining as a rehabilitation technique

Our study determined that it was highly degraded and required a structural lining

We also found a leak during the study, losing about $20,000 worth of water a year

Slide32

Newark, New Jersey

32

Pit #1 - Valve

Pit #2

Pit #3

Fire Hydrant

Service Leak at House #195

Average Pipe Wall Thickness of 0.18

, 63.9% loss

Slide33

Newark, New Jersey

33

ConfidentialUse pursuant to Company instructions

This is the remaining structural thickness!

Slide34

Dayton, OhioSweetwater, CaliforniaHamilton, OntarioChicago, IllinoisSuccessfully identified 3000ft section of reinforced concrete cylinder pipe with a significant number of wire breaksCalgary, AlbertaMaple Ridge, British ColumbiaBloemfontein, South Africa

Other Examples:

Slide35

Summary

Echologics has pioneered the effective use of

correlators

on large diameter pipe, and continues to develop the technology

In North America, we are now considered a viable alternative to insertion technologies: numerous successful studies have been completed

Claims made by other manufacturers continue to throw the technology into doubt

In several projects we have been directly compared to Sahara and have found the same leaks

Our condition assessment technology can accurately determine the remaining structural wall thickness of pipes

There is return on investment from:

Prioritizing which pipes require rehab or replacement

Performing leak detection simultaneously

Ensuring the correct decision is made

with respect to

rehab or replacement


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