WATCH THE VIDEO HERE OR READ ON BELOW!  Elemental sulphur attack is NOT sulphidation or hydrogen sulphide corrosion. It is an aqueous corrosion phenomenon. It considers two modes -  acidification of sulphur - formation of sulphuric acid 2.      direct cathodic reduction of sulphur with anodic dissolution of iron The lowering of pH is the main source of corrosion in both the methods. The phenomenon is temperature dependent. It increases with increase in temperature and becomes particularly severe above the melting point of sulphur (~112.8 degree Celsius). Hydrogen sulphide present in the petroleum may aggravate the sulphur attack by enhancing uniform pitting corrosion. Monoethylene glycol is used to prevent condensate formation ans may be present in traces in the feedstock petroleum. This enhances the sulphur attack in the form of uniform corrosion, and crevice corrosion. References:  Fang, Haitao, Brown, Bruce, Young, David, and Srdjan Nešic. "Investigation...

CRV can be understood by using a simple example of milk kept for boiling in a pot on a stove. The motive, i.e. the reliability of this process has two main factors - 1) The milk should boil. 2) It should remain the vessel and not overflow. There are three critical variables here - Temperature  Why is this a critical variable?  Answer: The melting point of milk is 92 degrees C. That is the optimum level. If temperature is too low (30 degrees C), the milk may not boil at all. If the temperature is too high (200 degrees C), it may burn quickly. Vessel dimension = volume of milk is 1 ltr Why is this a critical variable?  Answer:  Vessel volume < 1 ltr, milk will not fit in it in the first at all. Vessel volume = 1 ltr, milk will fit, but will overflow on boiling Vessel volume >1 ltr, milk will fit and not overflow. Time Why is this variable critical? If the other two variable are at the optimum level, then -  Too less time (~ 1 min), insufficient for milk to r...

CRV stands for critical reliability variables. It notes the variables, i.e. parameters which are the most important in damaging the reliability of the equipment. In simple terms, it is that parameter which if changed will damage your equipment. This parameter is important in risk-based inspection. It helps to note the exact parameters, may be temperature, pressure, pH, which will increase the risk of corrosion and damage. WATCH THE VIDEO HERE Read the NExt parts here - Part 2 Part 3 Reference: "Development of Corrosion Control Document Database System in Crude Distillation Unit", Junghwan Kim, Wonsub Lim, Younghee Lee, Seungnam Kim, Sang-Rok Park, Sun-Kyu Suh, and Il Moon, Industrial & Engineering Chemistry Research 2011 50 (13), 8272-8277 DOI: 10.1021/ie101871a https://corrospective.com/ 😀Happy learning! 😀

The fertilizer industry is as complex as any other industry in terms of corrosion. Its corrosion issues begin from the storage area itself. There are four major areas that need to be looked at from the corrosion point of view - Production Storage Transportation Field application In the production stage, there are a few sub-steps. The first step begins with desulphurization. The motive is to remove the sulphur. This sulphur is present in the feedstock, which is the raw material to make the hydrogen for ammonium. The feedstock is petroleum and sulphur is an impurity. Along with this, there may be some produced water as well. This petroleum is stored in tanks made of carbon steel. It is transported to the process through carbon steel pipelines. Carbon steel is said to have less severe corrosion due to elemental sulphur. This corrosion due to elemental sulphur has mechanisms different from sulphidation and hydrogen sulphide corrosion. Watch the video for a detailed explanation Click here f...

How to prepare a corrosion loop? To prepare a corrosion loop, the person in charge will look at the overall picture and answer the following questions - 1. What is the process? 2. What are the components? 3. What are the materials for each component? 4. What are the common features among them? 5. Where does the commonality end? -  This is important as that will mark the beginning of a new corrosion loop. 6. Can I use the same inspection procedure for all of them? 7. Do they corrode/get damaged in the same manner due to the same reasons? WATCH THE VIDEO FOR A DETAILED EXPLANATION -       Read part 1 here! https://corrospective.com/ 😀Happy learning! 😀

Corrosion loop is used to simplify inspection procedures in refining processes. Corrosion loop is defined as a group of components with common materials, processes, and operating parameters.  Source: Rachman, A. and Ratnayake, R.M.C. (2020), "Corrosion loop development of oil and gas piping system based on machine learning and group technology method", Journal of Quality in Maintenance Engineering, Vol. 26 No. 3, pp. 349-368. https://doi.org/10.1108/JQME-07-2018-0058 It is needed when the scenario has - 1. Complex process 2. Several variables such a materials of construction, process parameters, functions 3. Multiple damage mechanisms WATCH THE VIDEO FOR A DETAILED EXPLANATION - Click here for part 2 ! https://corrospective.com/ 😀Happy learning! 😀

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