Important terms in API certifications - CRV & IOW - I

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.

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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

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Important terms in API certifications - CRV & IOW - II

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...

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