ASME Material Stress Historical References
ASME Material Stress Historical References
(OP)
Hi
Ive been doing work for our client in the refining industry and have been lots of BPVC analyses on the vessels in the field, mainly revolving around their build thicknesses.
I mainly work with vessels built to ASME Section VIII-I which references material properties from Section II Part D. The problem Im having is finding the proper stress values for the older equipment. The calculation software packages the client works with is limited to only so many revisions of specs, yet they want us to analyse this vessel in a manner to which it was built.
Does anyone know of a good resource for finding old historical codes and standards of Material Properties? This would make my life much easier if so!
-RG90
Ive been doing work for our client in the refining industry and have been lots of BPVC analyses on the vessels in the field, mainly revolving around their build thicknesses.
I mainly work with vessels built to ASME Section VIII-I which references material properties from Section II Part D. The problem Im having is finding the proper stress values for the older equipment. The calculation software packages the client works with is limited to only so many revisions of specs, yet they want us to analyse this vessel in a manner to which it was built.
Does anyone know of a good resource for finding old historical codes and standards of Material Properties? This would make my life much easier if so!

-RG90





RE: ASME Material Stress Historical References
But I suspect that most of your work will relate to post 1968 vessels, so you should be fine using the 1995 edition.
RE: ASME Material Stress Historical References
Yes the package has a 1995 edition for this particular material, but varies in its dates for other materials depending on the type.
This project is in its initial implementation so we're still trying to decipher much of the code but here's the reoccurring predicament:
Ex) I get a vessel with a U1 doc saying its built at a specific date, lets say 1981, and its got a Ellipsoidal head made of 0.187" of SA-240-304L and designed at 150F. When I go to run a minimum thickness calc using properties of the 1995 code, the minimum thickness exceeds what its actually built at.
This prompted me to look at an older edition of Section II from 1992 which yielded a higher Allowable Stress at the same temp, which puts me in the green. I have a handful of vessels like this which makes me think that the stresses are not actually consistent from '68-'98 and if I could get my hands on these codes then Id be out of the dark.
RE: ASME Material Stress Historical References
ReliabilityGuy90, it'd be good if you could get the Sec II, Part D for the years your vessels were built. Unfortunately I don't know where to suggest you can get them.
Regards,
Mike
On Edit: See this: thread794-414686: ASME VIII Section 1 1965 or 1968 Editions
RE: ASME Material Stress Historical References
RE: ASME Material Stress Historical References
Now, for the example given by ReliabilityGuy90, specifically SA-240 304L at 150°F, the Spring 1982 addenda to the 1980 edition Table UHA-23 shows a max. allowable stress in tension of 15.7 ksi thru 200°F with note 1 which is the familiar "where slightly greater deformation is acceptable". In other words, this is the "high stress" variety.
The un-noted version (the "low stress" variety) of SA-240 304L has an allowable stress of 15.7 ksi up to 100°F, dropping to 13.4 ksi at 200°F. As SnTMan points out, values changed, and this particular line is noted as having changed with this addenda (Spring '82). Having said that, a quick comparison with the 1977 ed. Spring '79 addenda does not show any change... Maybe I'm missing something, or perhaps something changed and then was changed back.
I suspect that the issue you are facing may be due to using the high stress version in calculating the head thickness during the original design (in my opinion a valid decision), while your current check may be using the low stress value.
RE: ASME Material Stress Historical References
Thanks for the tips, this will definitely get us moving in the right direction