scholarly journals Hydraulic Transient Analysis and Leak Detection on Transmission Pipelines: Field Tests, Model Calibration, and Inverse Modeling

2007 ◽  
Author(s):  
Mark L. Stephens ◽  
Angus R. Simpson ◽  
Martin F. Lambert
Keyword(s):  
Inverse Modeling ◽  
Model Calibration ◽  
Transient Analysis ◽  
Field Tests ◽  
Leak Detection ◽  
Hydraulic Transient ◽  
Transmission Pipelines

scholarly journals Leak detection by inverse transient analysis in an experimental PVC pipe system

2010 ◽  
Vol 13 (2) ◽  
pp. 153-166 ◽  
Author(s):  
Alexandre Kepler Soares ◽  
Dídia I. C. Covas ◽  
Luisa Fernanda R. Reis
Keyword(s):  
Transient Analysis ◽  
Mechanical Response ◽  
Research Work ◽  
Leak Detection ◽  
Distribution Networks ◽  
Economic Losses ◽  
Water Supply Systems ◽  
Transient Pressure ◽  
Pipe System ◽  
Hydraulic Transient

Leakage reduction in water supply systems and distribution networks has been an increasingly important issue in the water industry since leaks and ruptures result in major physical and economic losses. Hydraulic transient solvers can be used in the system operational diagnosis, namely for leak detection purposes, due to their capability to describe the dynamic behaviour of the systems and to provide substantial amounts of data. In this research work, the association of hydraulic transient analysis with an optimisation model, through inverse transient analysis (ITA), has been used for leak detection and its location in an experimental facility containing PVC pipes. Observed transient pressure data have been used for testing ITA. A key factor for the success of the leak detection technique used is the accurate calibration of the transient solver, namely adequate boundary conditions and the description of energy dissipation effects since PVC pipes are characterised by a viscoelastic mechanical response. Results have shown that leaks were located with an accuracy between 4–15% of the total length of the pipeline, depending on the discretisation of the system model.

Leak detection of long-distance district heating pipeline: A hydraulic transient model-based approach

Energy ◽  
2021 ◽  
pp. 121604
Author(s):  
Xuejing Zheng ◽  
Fangshu Hu ◽  
Yaran Wang ◽  
Lijun Zheng ◽  
Xinyong Gao ◽  
...  
Keyword(s):  
District Heating ◽  
Leak Detection ◽  
Long Distance ◽  
Transient Model ◽  
Hydraulic Transient ◽  
Model Based

scholarly journals A Nelder–Mead algorithm-based inverse transient analysis for leak detection and sizing in a single pipe

2021 ◽  
Author(s):  
Oussama Choura ◽  
Caterina Capponi ◽  
Silvia Meniconi ◽  
Sami Elaoud ◽  
Bruno Brunone
Keyword(s):  
Transient Analysis ◽  
Experimental Tests ◽  
Leak Detection ◽  
Calibration Procedure ◽  
Second Phase ◽  
Viscoelastic Parameters ◽  
The Difference ◽  
Single Pipe ◽  
The University ◽  
Nelder Mead Algorithm

Abstract In this paper the results of an experimental validation of a technique for leak detection in polymeric pipes based on the inverse transient analysis (ITA) are presented. In the proposed ITA the Nelder–Mead algorithm is used as a calibration tool. Experimental tests have been carried out in an intact and leaky high-density polyethylene (HDPE) single pipe installed at the Water Engineering Laboratory (WEL) of the University of Perugia, Italy. Transients have been generated by the fast and complete closure of a valve placed at the downstream end section of the pipe. In the first phase of the calibration procedure, the proposed algorithm has been used to estimate both the viscoelastic parameters of a generalized Kelvin–Voigt model and the unsteady-state friction coefficient, by minimizing the difference between the numerical and experimental results. In the second phase of the procedure, the calibrated model allowed the evaluation of leak size and location with an acceptable accuracy. Precisely, in terms of leak location the relative error was smaller than 5%.

Coupled neutronic thermal–hydraulic transient analysis of accidents in PWRs

2012 ◽  
Vol 50 ◽  
pp. 158-166 ◽  
Author(s):  
M. Aghaie ◽  
A. Zolfaghari ◽  
A. Minuchehr
Keyword(s):  
Transient Analysis ◽  
Hydraulic Transient

A Proposed Guideline for Applying Waterhammer Predictions Under Transient Cavitation Conditions: Part 1 — Pressures

2018 ◽  
Author(s):  
Matthew Stewart ◽  
Trey W. Walters ◽  
Greg Wunderlich ◽  
Erin A. Onat
Keyword(s):  
Stress Analysis ◽  
Transient Analysis ◽  
Field Data ◽  
Method Of Characteristics ◽  
Great Majority ◽  
Test Field ◽  
Safety Factors ◽  
Hydraulic Transient ◽  
Simple Systems ◽  
Additional Safety

Waterhammer analysis (herein referred to as Hydraulic Transient Analysis or simply “HTA”) becomes more complicated when transient cavitation occurs (also known as liquid column separation). While standard HTA transient cavitation models used with analysis based on the Method of Characteristics show good correlation when compared to known test/field data, the great majority of test/field data are for simple systems experiencing a single transient. Transient cavitation in more complicated systems or from two or more independently initiated transients have not been validated against data. Part 1 of this paper describes the various safety factors already provided by ASME B31.3 for pressure containment, provides criteria for accepting the results of HTA calculations that show the presence of transient cavitation, and makes recommendations where the user should include additional safety factors based on the transient cavitation results. Situations are discussed where waterhammer abatement is recommended to reduce hydraulic transient pressures and forces, and for increasing confidence in HTA results in specific cases. The result is a proposed comprehensive and pragmatic guideline which practicing engineers can use to perform waterhammer analysis and apply pressure predictions to pipe stress analysis.

Enhancing Liquid Hydrocarbon Pipeline Leak Detection Using Instrumented Aerial Surveillance

2014 ◽  
Author(s):  
Adrian Banica ◽  
Doug Waslen ◽  
Boyd T. Tolton
Keyword(s):  
Natural Gas ◽  
New Technology ◽  
Field Tests ◽  
Ground Level ◽  
Leak Detection ◽  
Liquid Hydrocarbon ◽  
Aerial Surveillance ◽  
Natural Gas Pipelines ◽  
Test Methodology ◽  
Detection Technology

Suncor Energy Inc. contacted Synodon as part of an effort to enhance pipeline leak detection. Ideally, Suncor needed a technology that could detect natural gas as well as liquid hydrocarbon releases. Synodon’s new technology is an aircraft mounted gas remote sensing instrument that has been used for detecting leaks from natural gas pipelines for over four (4) years and was expanding their capability to include liquid hydrocarbons. This paper will describe the steps that Suncor and Synodon have taken over the last two years to develop and validate this detection technology. Synodon completed a number of studies including laboratory and field tests that demonstrated the ability of Synodon’s technology to remotely detect ground-level plumes of vapours released from a liquid hydrocarbon pipeline. Synodon conducted full atmospheric analytic modeling followed by laboratory measurements to determine the level of sensitivity of its instrument measurement to both methane and various liquid hydrocarbon vapors including gasoline, condensates and synthetic crude oil. Suncor participated in the development of test methodology and field execution in order to witness and validate the results. Based on this work, Suncor has determined an optimum inspection frequency based on theoretical spill size, SCADA leak detection thresholds and conventional aerial patrol constraints. The results and conclusions of this work will be presented.

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