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NACE MR0175 - 2002 vs 2003 1

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Gorman3

Industrial
Joined
Jul 30, 2007
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43
Location
US
I have an old supplier that has been producing NACE MR0175 valves for a long time. Until now I had never known there were 2 different versions. If I am using WCB castings with API trim 12, what is different between the 2 versions?

I'm guessing it will have something to do the time or temp of heat of treatment or something to do with welding; but that's just a guess.
My supplier is gonna let me know which version, but I still want to know the differences.

thanks!
 
Depending upon the application people also use another NACE Standard MR0103. MR0175 (ISO 15156-1) 2001 (my copy was published 2005) is used upstream and MR0103 2005 is used in refining.
 
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