Devices for automated regulation of the velocity of in-tube pig flaw detectors (Review)

Podgorbunskikh, A. M.

doi:10.1134/s1061830908050070

Cited by 14 publications

(8 citation statements)

References 2 publications

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“…Un baipás permite el paso de fluido de atrás hacia adelante del PIG y tiene como resultado que la velocidad de desplazamiento del dispositivo sea diferente de la velocidad media de flujo. Se han realizado varios estudios para diseño de PIG con baipás (Nguyen et al, 2001;Boe, 2007;Korea Gas Corporation, 2010;Podgorbunskikh, 2008). En algunos casos los orificios de baipás son utilizados para obtener chorros del mismo fluido a los fines de mejorar los resultados de las pasadas de limpieza.…”

Section: Methodsunclassified

“…The use of so-called by-pass orifices in a PIG's body is one way to reduce speed excursions A bypass allows fluid passage from back to front of a PIG and the device's displacement speed is different from average flow speed. Several studies have been aimed at designing PIGs having a by-pass (Nguyen et al, 2001;Boe, 2007;Korea Gas Corporation, 2010;Podgorbunskikh, 2008). In some cases, by-pass holes are used to form jets of the same fluid to enhance cleaning results; in other cases, a valve is added to the orifice and allows a PIG's speed to be controlled (Frota, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Evaluating drag force and geometric optimisation of pipeline inspection gadget (PIG) body with bypass

Ramírez

Dutra

2011

Ing. Inv.

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A pipeline inspection gadget (PIG) is a device used to run through pipelines for cleaning, measurement and inspection operations. By-pass is the name for one or a set of orifices allowing flow from back to front of a PIG. It is used for speed control or to improve cleaning operations results. By-pass prevents speed excursions in gas pipelines thereby avoiding damage to the PIG or the pipe. Studies and algorithms have been developed to simulate the dynamics of PIGs running inside pipes. Most studies have been for gas pipelines; these have helped to design some PIG models. This work summarises a particular stage during a PIG design project. This PIG will work in liquid pipelines and can stop in the line for inspection and maintenance tasks. Studying fluid force on a PIG when it has low or zero speed is needed for evaluating project feasibility and conceptual design. Selecting a PIG form to minimise the force of interaction with fluid allows a low weight design and lower energy loss.

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Section: Methodsunclassified

Section: Introductionmentioning

confidence: 99%

Evaluating drag force and geometric optimisation of pipeline inspection gadget (PIG) body with bypass

Ramírez

Dutra

2011

Ing. Inv.

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“…Problems such as pig getting stuck in pipeline or crashing with pipeline accessories are some of the risks associated with pigging process (Rahe, 2006;Podgorbunskikh, 2008;Podgorbunskikh and Loskutov, 2008;Guibin et al, 2011). As a result, predicting the motion of a pig to estimate its velocity, position and required driving pressure is particularly important before pigging.…”

Section: Introductionmentioning

confidence: 98%

Numerical simulation of contact force on bi-directional pig in gas pipeline: At the early stage of pigging

Zhu

Zhang

et al. 2015

Journal of Natural Gas Science and Engineering

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“…Pipeline pigging is a standard industrial process, during which a conventional pipeline inspection gauge (PIG) would be used to remove the wax debris from the inner pipewell. There are lots of experimental and theoretical effort directed toward exploring pigging motion and PIG devices, for example, O'Donoghue, 1 Azevedo and colleagues, [2][3][4] Jonathan, 5 Botros and Golshan, 6 Nguyen and colleagues, [7][8][9][10] Tolmasquim and Nieckele, 11 Podgorbunskikh et al, [12][13][14][15] Tan et al [16][17][18] and Wang and colleagues. [19][20][21] But as the riser is in a complex environment, it would float forced by the marine loads.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on axial load transfer behavior of a coiled tubing stuck in a marine riser

Chen

Zhang

Wang

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part M:

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After years of using, the marine riser would need pigging operation to remove wax and other debris attached to its interior to recover production. Due to its low stiffness, coiled tubing would buckle when performing the marine riser pigging operation, which would make the injecting force not able to completely transfer into its end and finally damage coiled tubing and riser. Thus, in order to ensure the safety and reliability of the operation, this article reports an experimental study on this topic by building an indoor pipe-in-pipe platform. According to the experimental results, the inner pipe's axial force transfer efficiency is always less than 1. When injecting force is less than the inner pipe's critical helical buckling load, the inner pipe's axial load transfer efficiency is basically the same under ''unfixed boundary'' and ''fixed boundary'' at the same force-out. When injecting force is bigger than the inner pipe's critical helical buckling load, ''unfixed boundary'' would help decrease the inner pipe's axial load transfer efficiency; when the injecting force is three times the critical helical buckling load, the inner pipe's axial load transfer efficiency of ''unfixed boundary'' can be 3% smaller than that of ''fixed boundary.'' As the outer pipe of ''unfixed boundary'' would elongate, its axial load transfer would be ''delay'' compared with ''fixed boundary,'' which means injected displacement of ''unfixed boundary'' inner pipe would be bigger than those of ''fixed boundary'' at the same force-out. The research done above might provide important theoretical supports for the marine riser pigging operation.

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Devices for automated regulation of the velocity of in-tube pig flaw detectors (Review)

Cited by 14 publications

References 2 publications

Evaluating drag force and geometric optimisation of pipeline inspection gadget (PIG) body with bypass

Evaluating drag force and geometric optimisation of pipeline inspection gadget (PIG) body with bypass

Numerical simulation of contact force on bi-directional pig in gas pipeline: At the early stage of pigging

Experimental study on axial load transfer behavior of a coiled tubing stuck in a marine riser

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