Skip to main content

Important terms in API certifications - CRV & IOW - II

Image
By

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 reach boiling point

Too much time (~ 2 hours), milk will boil and condense, taste will change

Optimum time (~ 10 min), milk will boil, not overflow, and the heating will be stopped at the correct time.



Thus, maintaining the three CRVs will help to initiate and complete the process of boiling milk perfectly.

So, whenever one has to decide the CRV for larger processes, the important questions to ask are -



      • WHY IS THIS VARIABLE CRITICAL? 
      • WHAT WILL HAPPEN IF IT DEVIATES? 
      • HOW BAD WILL THE DAMAGE BE?

WATCH THE VIDEO HERE



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


Read the other parts here -

Part 1
Part 3


https://corrospective.com/


😀Happy learning!😀




Labels:

Comments

Post a Comment

Welcome to the CORROSPECTIVE BLOG! Scroll along for more posts! Looking forward to your feedback!
P.S. Don't forget to check out the free quizzes!

Popular posts from this blog

The drain mystery

By
I recently moved to a new house. As expected, there was a lot of cleaning up to do. One of the tasks was the cleaning of the washbasin. Usually, the drain is a circular part with  5 to 6 holes for the water to flow out. What I saw was this - I have not had a chance to analyse the material of the drain. However, a quick search tells me that this is most probably stainless steel. The water that this drain is exposed to is the bore water. Thus, the drain has encountered a lot of chlorides. There is general as well as localized corrosion. The damage started off as a simple process of pitting. Pitting due to chlorides is one of the most common headaches for poor stainless steel. They break the passive oxide film, and reach the underlying fresh iron. This iron then reacts with the usual suspects (ions, oxygen, water) and forms what we see as the rust. As can be seen in the picture, the thin sections of the drain between the holes have disappeared in three places. This may have h...
Post a Comment
Read more

Corrosion in daily life - Steel frames on a balcony

By
Corrosion in daily life - Steel frames Looking at LinkedIn, corrosion may feel like an extremely intricate issue seen in large industries. However, looking around, we can see corrosion everywhere! Where was this photo taken? The photo above is of a steel frame attached to a balcony.  The part shown here is the bottom part of the frame. The coatings for such steel parts usually serve the purpose of moderate corrosion protection and more of aesthetics. If you observe, the thickness of the coatings also does not seem to be a lot. Why did the coating degrade? When it rains, the rainwater collects on the bottom of the frames.  This degrades the coating. At the places where it is not perfect anyway, the underlying steel is free to corrode. Most importantly, corrosion is more severe at the edges. It is severe enough to chip off the material entirely. That point is a prime site for crack formation and breaking of the frame. Have you seen such corrosion in your balcony fram...
4 comments
Read more

CAREER OPTIONS IN CORROSION

By
  CAREER OPTIONS IN CORROSION The first time I studied corrosion was in 2009. The last 14 years have taught me one important thing - The path of a career in corrosion is not as straightforward as we are led to believe. Whether we are starting as a student of corrosion, or are entering the field after working as a non-corrosion person, there is always some career pathway that we are not aware of. There are research projects, certifications , audits, inspections , etc. EveryEng gave me the opportunity to share my learnings about the possible options in the field of corrosion . If you are someone who is starting or wants to switch to/between corrosion and its related fields, here is a short presentation for you! https://www.everyeng.com/mentor/course/view/3559864f 😀 Happy learning! 😀
Post a Comment
Read more