Scipediacontent: Scipediacontent moved page Draft Content 232280159 to Lambert et al 2007a

2021-01-28T19:20:03Z

Scipediacontent moved page Draft Content 232280159 to Lambert et al 2007a

Scipediacontent: Created page with " == Abstract == The use of hydraulic transients for leak detection is theoretically possible assuming that water pipelines respond elastically and that current transient mode..."

2021-01-28T19:19:57Z

Created page with " == Abstract == The use of hydraulic transients for leak detection is theoretically possible assuming that water pipelines respond elastically and that current transient mode..."

New page

== Abstract ==

The use of hydraulic transients for leak detection is theoretically possible assuming that water pipelines respond elastically and that current transient models are capable of replicating measured responses from real pipelines. This paper presents results for tests using hydraulic transients with and without a leak on a typical transmission main in South Australia. The size of the leak artificially introduced to the pipeline was set at the maximum limit of interest to South Australian Water Corporation operators. Based on the results of the field tests and modelling performed using a quasi-steady friction transient numerical model it was found that it was difficult to model the response of the pipeline, without and with the introduced leak, because of unsteady friction and mechanical dispersion and damping of the transient waveforms. Inverse analysis was performed using the quasi-steady friction transient model and it was found that leak could not be successfully detected. The transient model was improved by including unsteady friction and a viscous damping mechanism that was calibrated for inelastic mechanical effects using no-leak measured responses. Inverse transient analysis was performed using this improved model focussed on reflection information over 2L/a seconds of the measured leak responses and over an extended period. The small size of the direct reflections from the artificial leak made them difficult to discern amongst other reflections from elements not related to the leak. The inverse transient analysis performed over an extended period made use of leak damping information but was also affected by sources of damping not related to the leak. It was found that the improved forward transient model, in combination with prior information regarding the leak discharge (commonly available for flow monitored transmission pipelines), gave the best estimate of the location and size of the leak. However, the true leak was not identified as the optimal candidate following the inverse transient analysis because of persistent inadequacies in the replication of all the physical complexities affecting the measured transient responses.

== Original document ==

The different versions of the original document can be found in:

* [https://digital.library.adelaide.edu.au/dspace/bitstream/2440/66259/2/hdl_66259.pdf https://digital.library.adelaide.edu.au/dspace/bitstream/2440/66259/2/hdl_66259.pdf]

* [http://ascelibrary.org/doi/pdf/10.1061/40927%28243%29476 http://ascelibrary.org/doi/pdf/10.1061/40927%28243%29476],
: [http://dx.doi.org/10.1061/40927(243)476 http://dx.doi.org/10.1061/40927(243)476]

* [https://ascelibrary.org/doi/10.1061/40927%28243%29476 https://ascelibrary.org/doi/10.1061/40927%28243%29476],
: [https://cedb.asce.org/CEDBsearch/record.jsp?dockey=159862 https://cedb.asce.org/CEDBsearch/record.jsp?dockey=159862],
: [https://academic.microsoft.com/#/detail/2319763184 https://academic.microsoft.com/#/detail/2319763184]

* [ ]

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Lambert et al 2007a - Revision history

Scipediacontent: Scipediacontent moved page Draft Content 232280159 to Lambert et al 2007a

Scipediacontent: Created page with " == Abstract == The use of hydraulic transients for leak detection is theoretically possible assuming that water pipelines respond elastically and that current transient mode..."