Determination of the Place Depressurization of Underground Pipelines in the Monitoring of Oil and Gas Enterprises
Volodymyr Yuzevych1, Fedir Horbonos2, Roman Rogalskyi3, Iryna Yemchenko4, Mykhailo Yasinskyi5

1Volodymyr Yuzevych, Department of Electrophysical Methods of Non-Destructive Testing, Karpenko Physico-mechanical Institute of the NAS of Ukraine, Lviv, Ukraine
2Fedir Horbonos*, Lviv University of Business and Law, Lviv, Ukraine.
3Roman Rogalskyi, Department of Transport Technologies, Lviv Polytechnic National University, Lviv, Ukraine
4Iryna Yemchenko, Department of Commodity Science and Expertise in Customs, Lviv University of Trade and Economics, Lviv, Ukraine.
5Mykhailo Yasinskyi, Department of Engineering Mechanics, Ukrainian Academy of Printing, Lviv, Ukraine.

Manuscript received on April 30, 2020. | Revised Manuscript received on May 06, 2020. | Manuscript published on May 30, 2020. | PP: 2274-2281 | Volume-9 Issue-1, May 2020. | Retrieval Number: A2941059120/2020©BEIESP | DOI: 10.35940/ijrte.A2941.059120
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Abstract: Analytical correlations of mathematical model that characterizes the processes of development of corrosive cavity on the surface of underground metallic pipeline are analysed. A pipeline in the environment of moist soil with solution of electrolyte is placed. In the top of cavity a crack appears and translates the system “underground pipeline (UP) – pumping station (PS)” in the state of depressurization. A new approach is proposed for diagnosing places of underground pipeline depressurization on the basis of two types of devices: pressure sensors and non-destructive testing devices, with the help of which we measure potentials and corrosion currents in surface defects. The presence of only pressure sensors makes it possible to set the coordinates of depressurization with a large error – 20…25%. Diagnosis of the pipeline only by devices BVS-K, VPP-M (at the first stage) allows to reveal surface defects. But this information is not enough for a qualitative experiment, as shown by the qualimetric quality criterion. Taking into account the pressure data in the second stage allows to determine which of the defects is the leakage point. A test example for the distance L1 = 6 km from the pumping station of the pipeline is considered. The results of the experiment are used for the example and the growth time of the corrosion crack t = 0.62 year is established. On the basis of computational experiment the errors of estimating of crack growth time t and coordinates of the leakage points was established. They present 5…7 %. Based on the method of neural networks, the main informative parameters for determining the places of depressurization on the surface of the underground pipe are estimated. A method for estimating the gas pressure change in the vicinity of the crack after depressurization of the pipeline was proposed. The principles of determining the limit values of the parameters of the system “pipeline – pumping station” taking into account the criteria of quality and strength of the metal are formulated.
Keywords: Depressurization of gas pipelines, gas transportation enterprises, gas, corrosion, pressure sensors, neural network, non-destructive testing, anode current.
Scope of the Article: Transportation