International Journal of Innovation and Applied Studies ISSN 2028-9324 Vol. 1 No. 2 Dec. 2012, pp. 153-159 © 2012 Innovative Space of Scientific Research Journals http://www.issr-journals.org/ijias/ Corresponding Author: Amir Samimi (amirsamimi1161@gmail.com) 153 Investigation of Corrosion of the Pipeline Using TOEFLT in Iran Refinery Amir Samimi and Soroush Zarinabadi Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran Copyright © 2012 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT: Corrosion, from long time before was a greatest problem in oil and gas industry and experts have always tried to combat this major problem. This has been given to the corrosion and inspection in oil and gas industry. Corrosion in oil and gas wells has the electrochemical mechanism, When the system reaches a temperature below the dew point, moisture is converted to liquid and many droplets occurs on the pipe's wall. In the electrochemical reaction, water plays role of the electrolyte. The water that creates was not corrosion by itself. When the acidic gases such as H 2 S and CO 2 are dissolved in water create an acidic environment which in the vicinity of the steel will cause severe corrosion. Sometimes in oil wells, oxygen is one of the corrosive gases too. In the oil and gas industries, corrosion may be localized or uniform. Localized corrosion, can be create under the insulators, sediment and bacteria, was 10 to 100 times faster than uniform corrosion lead to destruction and there are many costs and risks associated with it. KEYWORDS: Corrosion, Oil and Gas Industry, Temperature, Water. 1 INTRODUCTION International Journal of Innovation and Applied Studies (IJIAS) is a peer reviewed multidisciplinary international journal publishing original and high-quality articles covering a wide range of topics in engineering, science and technology. IJIAS is an online journal having full access to the research and review paper [1]. It is published six issues per year in English, French and Spanish. The journal aims to give its contribution for enhancement of research studies and be a recognized forum attracting authors and audiences from both the academic and industrial communities interested in state-of-the art research activities in innovation and applied studies. Corrosion, from long time before was a greatest problem in oil and gas industry and experts have always tried to combat this major problem. This has been given to the corrosion and inspection in oil and gas industry. Corrosion in oil and gas wells has the electrochemical mechanism, When the system reaches a temperature below the dew point, moisture is converted to liquid and many droplets occurs on the pipe's wall. In the electrochemical reaction, water plays role of the electrolyte. The water that creates was not corrosion by itself. When the acidic gases such as H 2 S and CO 2 are dissolved in water create an acidic environment which in the vicinity of the steel will cause severe corrosion. Sometimes in oil wells, oxygen is one of the corrosive gases too. In the oil and gas industries, corrosion may be localized or uniform. Localized corrosion, can be create under the insulators, sediment and bacteria, was 10 to 100 times faster than uniform corrosion lead to destruction and there are many costs and risks associated with it. Suitable inhibitors can be added to the system to control the localized and uniform corrosion. To evaluate performance of inhibitor and determine the rate of corrosion, the system must be monitored regularly. There are various methods to corrosion monitor. For instance, could name of weight loss coupons, ophthalmic, acoustic emission, ER and LPR probes and hydrogen probes. To ensure of accurate monitoring, each of these methods are used as a complement to other methods. Recently, extensive researches on the use of this technique in the evaluation of corrosion interceptors were done.