epulse Acoustic Pipe Condition Assessment Director, Business Development

Transcription

1 epulse Acoustic Pipe Condition Assessment Iain Davies: Matti Andersin: Director, Business Development Director Saint-Gobain Pipe Systems

2 Echologics Technologies and Services for Leakage Reduction and Asset Management Owned by Mueller Co - $1.5Bn company on NYSE HQ Toronto - offices in US, Europe, Asia, Australia Award winning acoustic technology Over 5,000km of pipeline surveyed to date 2

3 Echologics Core Offerings 1 Pipe Condition Assessment 2 3 DX Pipeline Condition Monitoring Monitoring for Critical Pipelines, Distribution TX Trunk Main Leak Detection Transmission Main Leak Detection 4 Leakage Monitoring Networks Permanent Distribution Main Leak Detection 3

4 epulse Acoustic Pipe Condition Assessment Non-destructive & Non-invasive Determines average remaining wall thickness between two points on the pipeline Effective on all Metallic and AC pipe Effective on any Diameter Direct indication of The current structural strength of the pipe The state of degradation of the pipe Can be used to evaluate The fitness for service of the line The remaining useful life 4

5 Condition Assessment Methods In general we have found Companies use a replacement programs based on desk top models. Desktop study Survey level inspection (epulse) Detailed NDT inspection Destructive testing Total Replacement Selective Replacement Selective Refurbishment No Action Lowering of Risk Deferral of Capital 5

6 epulse Method Summary Method Requirements Pressure >15 psi No air in pipe Contact points every 100m to 200m Diameter : Thickness ratio of 30:1 or less Pipe information (maps, as-builts, repair sections, etc.) Deliverables For Each Test Segment Leak locations and estimated sizes Average structural wall thickness Percentage loss Qualitative condition Remaining service life also available for AC and iron mains 6

7 Structural Thickness in Cast Iron Tuberculation and graphitic material not adding to strength Remaining structural thickness Cast iron Graphitisation is a weakness on the pipe and does not add strength, it has no impact on improving the hoop stiffness. (The ability for the pipe to deal with expansions and contractions.)

8 Structural Thickness in AC Calcium leaches out of cement in reaction to aggressive waters Remaining material cannot bear structural load Phenolphthalein dye reveals remaining thickness but samples are required Remaining structural thickness 8

9 Acoustic Methodology A low frequency acoustic pressure wave (Sound) is induced Causes the pipe wall to flex on a microscopic level Thicker (and therefore stiffer) pipe walls are more resistant to this flexing causing the wave to travel faster Measuring this phenomenon allows calculation of remaining wall thickness Graphitized material: Tuberculation: Not structural, not measured Not structural, not measured Longitudinal Crack Reduces structural thickness Structural Wall Thickness 9

10 Measurements on each Pipe Segment Sensor Connection Valve/Hydrant for sensor connection Leak Detect on each segment Velocity measurement per segment of pipe OOB signal induced by flow or tapping on pipe Measurements cleaned using sound editing software to eliminate background noise Analysis to choose most accurate velocity value Optimum velocity value used in calculations 10

11 Hardware LeakFinderST Correlator 11

12 Software Interface 12

13 Innovation Awards 13

14 Why Echologics? Proprietary technology designed by our own acoustics engineers and ST Highly sensitive noise sensors Advanced signal processing Windows based interface High resolution soundcard records and playbacks signals Enhanced cross correlation and velocity measurement in the frequency domain 14

15 Sensor Connection 15

16 Velocity Measurement Noise Source Periods coming through the pipe, sound systems pressure waves Sound is traveling down the pipe is expanding and contracting. The stiffer the pipe the more remaining wall stiffness and strength. 16

17 Example Velocity Plot 17

18 Equation 18

19 Interpretation of Results AC Mains Metallic Mains CCP Lost Wall Thickness Condition Colour Code Description Minor levels of uniform interior or Less than 10% Good Green Minor levels of degradation and/or isolated areas with minor loss of structural thickness Minor levels of uniform corrosion or some localized areas with pitting corrosion. exterior concrete degradation or localized areas with severe degradation. Minor possibility of corrosion of steel cylinder or reinforcement. 10% to 30% Moderate Yellow Considerable degradation and loss of structural thickness. Moderate levels of cement leeched away from asbestos matrix. Considerate levels of uniform surface or internal corrosion and/or localized areas of pitting corrosion. Considerate levels of degradation and loss of wall stiffness. Some corrosion of steel cylinder and reinforcement. Significant degradation and loss Significant uniform Significant degradation and loss Greater than 30% Poor Red of structural thickness. Substantial levels of cement corrosion and/or numerous areas of of wall stiffness and corrosion of steel cylinder and leeched from asbestos matrix. localized pitting corrosion. reinforcement. 19

20 Example Results 250mm AC Pipe - PWN, Netherlands 20

21 Example: Pipe Comparison Pipeline 1 Pipeline 2 Installed 1860 Installed 1860 Brown sandy soil Moderate soil corrosivity Echologics Results: 31% thickness loss Condition Prediction: Poor Brown clay soil Moderate soil corrosivity Echologics Results: 1% thickness loss Condition Prediction: Good 21

22 Project Example 1 Las Vegas Initial pilot study successful, now 5 year renewable contract Majority of AC assessed to be in excellent condition therefore identified mains that did not require rehab or replacement Also identified several areas of degradation on large diameter pipe Example: 1 section of 24 pipe assessed to be 38% degraded Also saved on replacement of 2.5 miles of 16 to 36 bar-wrapped steel cylinder transmission main (for 10 miles surveyed) Reduced overall rehabilitation budget by $2,000,000 22

23 Project Example 2 Newark New Jersey Problem: City relining water pipe in high-traffic road Estimated project cost more than $60,000 Results: ¼ service leak immediately located (annual marginal cost of water lost > $20,000) Identified section of pipe with 64% loss of structural integrity requiring replacement City now reviewing plans for annual distribution main rehabilitation program 23

24 Customer Requirements Feature Advantage Benefit Test from outside the main Works with all appurtenances Field tests fast, non-disruptive Report current wall thickness Verified and proven No operational disruptions No need to dig up the main or install new ports Test 1 km / team / day with minimal support Easily predict remaining useful life Dozens of utilities have verified our results Lower preparation costs. Water never contaminated. Sediment undisturbed. Lower total project costs. Minimal traffic disruptions. Scalable to large portions of a network Allows clear decisions about replacement or rehabilitation. Utilities can act with confidence in the information provided The low cost and minimal support required for epulse make it easy to scale to large portions of a network. 24

25 Netherlands to November 2014 Co s: Distance: Results: Evides, PWN, Dunea, WML and Brabant 23 km of mains tested 106 segments Good 59 Moderate, 25 Poor (15 n/a) 15 Percentage Loss Condition Colour Less than 10% Good Green 10% to 30% Moderate Yellow Greater than 30% Poor Red Good Moderate Poor N/A 25

26 Leaks Detected Since 2012 concurrent with epulse testing: 6 main breaks 3 Service Pipes 4 valve leaks Estimated volumetric saving of 1200 litres/minute 26

27 Ota yhteyttä: Saint-Gobain Pipe Systems