Detection of Partial Blockage in Single Pipelines

Mohapatra, Pranab Kumar; Chaudhry, M. Hanif; Kassem, Abdel Meguid; Moloo, Jamaluddin

doi:10.1061/(asce)0733-9429(2006)132:2(200)

Cited by 87 publications

(42 citation statements)

References 13 publications

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“…In cases where this configuration cannot be met, a similar oscillation pattern will still be evident in the FRD, although the equation describing this pattern will deviate from Eq. (11). A similar approach to the one presented can be taken to derive the governing equation for these alternative configurations.…”

Section: Challenges In Real Systemsmentioning

confidence: 99%

“…However, this approach is ambitious as the resultant expression will likely to be very complex compared to the form of Eq. (11) and this expression will also be specific to a particular network topology. Alternatively, Lee et al (2005) presented a method where a complex system can be subdivided into individual single pipes and the FRD of each individual pipe segment within the network can be extracted.…”

Section: Challenges In Real Systemsmentioning

confidence: 99%

“…There has been recent work into the use of the FRD for detecting blockages in liquid pipelines (Wang et al 2005; Mohapatra et al 2006; Lee and Vitkovský 2006), but the effect of a discrete blockage on the FRD has not been quantified. In this paper an analytical expression is derived that allows discrete blockages to be detected within a single pipeline system using the shape of the FRD.…”

Section: Introductionmentioning

confidence: 99%

“…Formulation of the overall system transfer matrix and substituting U 11 and U 21 into Eq. (7) gives the frequency response measured at a position just upstream of the inline valve as…”

Section: Introductionmentioning

confidence: 99%

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Discrete Blockage Detection in Pipelines Using the Frequency Response Diagram: Numerical Study

et al. 2008

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This paper proposes the use of fluid transients as a noninvasive technique for locating blockages in transmission pipelines. By extracting the behavior of the system in the form of a frequency response diagram, discrete blockages within the pipeline were shown to induce an oscillatory pattern on the peaks of this response diagram. This pattern can be related to the location and size of the blockage. A simple analytical expression that can be used to detect, locate, and size discrete blockages is presented, and is shown able to cater for multiple blockages existing simultaneously within the system. The structure of the expression suggests that the proposed technique can be extended to situations where system parameters may not be known to a high accuracy and also to more complex network scenarios, although future studies may be required to verify these possibilities.Keywords: Frequency response; Linear systems; Transients; Water pipelines; Resonance; Numerical analysis. IntroductionThe increasing industrial reliance on pipeline systems for the transport of materials has led to the recent emphasis on technologies for the fast detection and location of faults within such systems. Amongst the types of problems that can occur in a pipeline system, the formation of blockages within the pipe poses a most elusive problem for existing fault detection technologies. Unlike leaks within piping systems, a blockage does not generate clear external indicators for its location such as the release and accumulation of fluids around the pipe. Often intrusive procedures, such as the insertion of a closedcircuit camera or a robotic pig, are required to determine the location of blockages. The creation of nonintrusive techniques for fault detection that gives a clear picture of the internal conditions of the pipeline is desirable, and the use of fluid transients for this purpose is a promising development.

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Section: Challenges In Real Systemsmentioning

confidence: 99%

Section: Challenges In Real Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Formulation of the overall system transfer matrix and substituting U 11 and U 21 into Eq. (7) gives the frequency response measured at a position just upstream of the inline valve as…”

Section: Introductionmentioning

confidence: 99%

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Discrete Blockage Detection in Pipelines Using the Frequency Response Diagram: Numerical Study

et al. 2008

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“…Frequency-domain analysis is used in applications such as resonance analysis (Chaudhry 1987;Wylie and Streeter 1993), leakage detection (Ferrante and Brunone 2003;Lee et al 2005aLee et al , 2005bLee et al , 2006Covas et al 2006;Kim 2005Kim , 2007Kim , 2008 and blockage detection (Mohapatra et al 2006a(Mohapatra et al , 2006bSattar et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Head- and Flow-Based Formulations for Frequency Domain Analysis of Fluid Transients in Arbitrary Pipe Networks

et al. 2011

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Applications of frequency-domain analysis in pipelines and pipe networks include resonance analysis, time-domain simulation and fault detection. Current frequency-domain analysis methods are restricted to series pipelines, single-branching pipelines and single-loop networks and are not suited to complex networks. This paper presents a number of formulations for the frequency-domain solution in pipe networks of arbitrary topology and size. The formulations focus on the topology of arbitrary networks and do not consider any complex network devices or boundary conditions, other than head and flow boundaries. The frequency-domain equations are presented for node elements and pipe elements, which correspond to the continuity of flow at a node and the unsteady flow in a pipe, respectively. Additionally, a pipe-node-pipe and reservoir-pipe pair set of equations are derived. A matrix-based approach is used to display the solution to entire networks in a systematic and powerful way. Three different formulations are derived based on the unknown variables of interest that are to be solved for, being the head-formulation, flow-formulation and the head-flow-formulation. These hold significant analogies to different steady-state network solutions. The frequencydomain models are tested against the method of characteristics (a commonly used timedomain model), with good result. The computational efficiency of each formulation is discussed with the most efficient formulation being the head-formulation.

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Hydrological Processes

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Detection of Partial Blockage in Single Pipelines

Cited by 87 publications

References 13 publications

Discrete Blockage Detection in Pipelines Using the Frequency Response Diagram: Numerical Study

Discrete Blockage Detection in Pipelines Using the Frequency Response Diagram: Numerical Study

Head- and Flow-Based Formulations for Frequency Domain Analysis of Fluid Transients in Arbitrary Pipe Networks

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