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Technical Briefs

Review of Corrosion Role in Gas Pipeline and Some Methods for Preventing It

[+] Author and Article Information
M. Karami

Department of Biomedical Engineering, Faculty of Biomedical Engineering,  Amirkabir University of Technology, Tehran, Iranmkarami19@aut.ac.ir

J. Pressure Vessel Technol 134(5), 054501 (Sep 06, 2012) (5 pages) doi:10.1115/1.4006124 History: Received October 08, 2011; Revised November 30, 2011; Published September 06, 2012; Online September 06, 2012

Nowadays, pipelines are the most important transportation artery and researches indicate that the pipelines will be a secure tool for energy transmission for over 50 years, which is more significant for petrochemical, oil, and gas industries. The large part of chemical fluids, especially natural gas, transmits with pipelines. These pipelines manufactured with large pipes that they can bear high pressures about several thousand kilogram per cubic centimeter. The gas pressure is obtained by high pressure station in long distances. The function of gas pipelines is very important and vital; therefore, they have to be safe. But unfortunately, utilization of old pipelines in operation increases probability of occurrence. The most important reasons of making these occurrences are the internal and external corrosions that are very effective in damaging gas pipelines, hence safety decreases. So, controlling of corrosion in gas pipelines needs to use cathodic protection with cathodic potential, substance becomes a cathode, and this system decreases the rate of corrosion. Periodic inspections of pipelines are essential, through a method called pigging. A pig is a device inserted into a pipeline which travels freely through it and is driven by the product flow to do specific tasks within the pipeline. In this paper, first, corrosion and its types, as one of the most important threats in gas pipelines, will be investigated. Then methods of controlling corrosion will be explained by stating that cathodic protection is the most important method. Finally, pigs will be investigated because it needs continuous inspections in the performance of pipelines for security reasons.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Types of corrosion in pipeline [2]

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Figure 2

The irregular length, width, and depth of a typical corrosion defect [4]

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Figure 3

Schematic representation of insulated pipes with the proposed cathodic protection [6]

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Figure 4

Schematic of the sacrificial-anode installation on pipeline [7]

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Figure 5

Components of MFL [11]

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Figure 6

Principle of operation of internal corrosion sensor based on the difference between the magnetic flux lines (a) in the absence of a defect and (b) in the presence of a metal loss defect [11]

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Figure 7

Ultrasonic inspection [12]

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