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Important terms in API certifications - CRV & IOW - III

INTEGRITY OPERATING WINDOW IOW can be understood by using a simple example of milk kept for boiling in a pot on a stove. The definition as per API 584 is   "established limits for process variables (parameters) that can affect the integrity of the equipment  if the process operation deviates from the established limits for a predetermined length of time” What are the important words here?    established limits  process variables  affect the integrity of the equipment process operation deviates predetermined length of time In the above example, let us keep the time as 1 hour. Now there are two critical variables here- Temperature  What is the IOW for temperature? Answer: The melting point of milk is 92 degrees C. That is the optimum level. For 1 hour, if temperature is below 40 degrees C, it may not boil at all. If the temperature is  above 120 degrees C, it may condense. So, the IOW = 40 - 120 degrees C Vessel dimension = volume of milk is 1 ...

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...