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Acoustic Based Condition Assessment of Asbestos Cement Water Transmission Laterals
The Southern Nevada Water Authority (SNWA) initiated a program to assess water transmission laterals that were constructed prior to 2000 and retained the services of HDR Engineering, Inc. (HDR) to provide condition assessment of approximately 108 miles in Las Vegas, Nevada. Echologics Engineering Inc. (Echologics) was retained by HDR to perform acoustic testing of the asbestos cement pressure pipe (ACPP) laterals to determine the presence of any leaks, as well as the overall average structural thickness of the pipe wall. The Echologics acoustic technology to determine pipe wall thickness uses the velocity of acoustic waves within the pipe to determine the structural thickness of pressurized water pipes. This technology is particularly effective on asbestos cement pipes. The method relies on the measurement of the acoustic velocity using easy-to-access measurement locations such as fire hydrants and control valves. In the case of the SNWA project, potholes were vacuum excavated to allow a direct connection to the pipe. Changes to the signal-specific changes to transmission or propagation velocity, can be related to changes in the pipe wall thickness. For the SNWA project four laterals were assessed using the acoustic technology, the North, Robinson, Foothills and Boulder City Laterals. The results of the pipe wall assessment were then related directly to the original specifications of the asbestos cement pipe. Working with HDR, an overall structural assessment of the pipe was conducted based on the results of the acoustic testing. This paper will outline the results of the SNWA study, as well as other studies that have verified the accuracy of the acoustic technology. It will also cover various criteria for establishing the residual life of the AC pipe.
Acoustic Based Condition Assessment of Asbestos Cement Water Transmission Laterals
The Southern Nevada Water Authority (SNWA) initiated a program to assess water transmission laterals that were constructed prior to 2000 and retained the services of HDR Engineering, Inc. (HDR) to provide condition assessment of approximately 108 miles in Las Vegas, Nevada. Echologics Engineering Inc. (Echologics) was retained by HDR to perform acoustic testing of the asbestos cement pressure pipe (ACPP) laterals to determine the presence of any leaks, as well as the overall average structural thickness of the pipe wall. The Echologics acoustic technology to determine pipe wall thickness uses the velocity of acoustic waves within the pipe to determine the structural thickness of pressurized water pipes. This technology is particularly effective on asbestos cement pipes. The method relies on the measurement of the acoustic velocity using easy-to-access measurement locations such as fire hydrants and control valves. In the case of the SNWA project, potholes were vacuum excavated to allow a direct connection to the pipe. Changes to the signal-specific changes to transmission or propagation velocity, can be related to changes in the pipe wall thickness. For the SNWA project four laterals were assessed using the acoustic technology, the North, Robinson, Foothills and Boulder City Laterals. The results of the pipe wall assessment were then related directly to the original specifications of the asbestos cement pipe. Working with HDR, an overall structural assessment of the pipe was conducted based on the results of the acoustic testing. This paper will outline the results of the SNWA study, as well as other studies that have verified the accuracy of the acoustic technology. It will also cover various criteria for establishing the residual life of the AC pipe.
Acoustic Based Condition Assessment of Asbestos Cement Water Transmission Laterals
Bracken, Marc (author) / Johnston, Dave (author) / Coleman, Matthew (author)
Pipeline Division Specialty Conference 2010 ; 2010 ; Keystone, Colorado, United States
Pipelines 2010 ; 815-825
2010-08-26
Conference paper
Electronic Resource
English
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