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Analysis of the Possibility of Determining the Internal Structure of Oil and Gas Pipes by CT Method

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Abstract:

A mathematical model has been developed to simulate the initial projections for computed tomography of large-sized oil and gas pipes and to transform the projections into the mass thickness distributions. The simulated projections of steel pipes with a diameter from 530 mm to 1420 mm are given with variation of ADC capacity and the number of photons incident on the front surface of the multichannel bremsstrahlung detector. The necessity of correct selection of these parameters is proved. A possibility to estimate the density distribution over a pipe cross section based on the inverse Abel transform for the fan-beam of bremsstrahlung is illustrated. The issues related to the technical feasibility of the computed tomography method for inspecting of large-sized pipes and concerning the estimation of the total scan time and the choice of ADC capacity are considered. Recommendations on the adjustment of the analog and digital signals ranges are given. The obtained results make it possible to evaluate the feasibility of designing a computer tomography system for monitoring large-sized oil and gas pipes.

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Periodical:

Materials Science Forum (Volume 970)

Pages:

187-201

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.970.187

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Online since:

September 2019

Authors:

Sergei Osipov, Sergei Chakhlov*, Jiang Shan, Daniyar Kairalapov

Keywords:

ADC Capacity, Bremsstrahlung, Computed Tomography (CT), Digital Radiography DR, Gaz Pipeline, Metal Artefacts, Non-Monoenergy Artifact, Oil Pipe

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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