A Study about Corrosion of the Pipeline Using TOEFL in Iran Refinery

International Journal of Chemistry; 2013
A Study about Corrosion of the Pipeline Using TOEFL in Iran Refinery
Ahmad Ilkhani
ahmad_ilkhani@yahoo.com
Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
ABSTRACT:
Corrosion in oil and gas wells possesses an 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 the role of the electrolyte. The water itself is not responsible for corrosion. When acidic gases such as H2S and CO2 are dissolved in water, they create an acidic environment which in the vicinity of the steel will cause severe corrosion. Sometimes in oil wells, oxygen, too, is a corrosive gas. In the oil and gas industries, corrosion may be localized or uniform. Localized corrosion can occur under insulation. Sediment and bacteria is 10 to 100 times faster than uniform corrosion, leading to costly degradation.
INTRODUCTION
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 H2S and CO2 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.
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