ASME VIII High Strength Stainless
ASME VIII High Strength Stainless
(OP)
I am designing a low pressure / low temperature ASME VIII, Div I stainless steel tank (DP: 75 psig; DT: 100 F; SA240-304 SS Material).
I have a vessel clip/lug (not lifting) that my stresses are getting above the allowable limits for SA240-304 SS.
My question is this:
1.) Is there an ASME VIII, Div I allowable stainless grade material with a higher yield strength than that of SA240-304 SS (30 ksi)? I would need something in the neighborhood of 40 ksi yield.
Adding steel is not really an option, as space and functionality come into plate. Thank you.
I have a vessel clip/lug (not lifting) that my stresses are getting above the allowable limits for SA240-304 SS.
My question is this:
1.) Is there an ASME VIII, Div I allowable stainless grade material with a higher yield strength than that of SA240-304 SS (30 ksi)? I would need something in the neighborhood of 40 ksi yield.
Adding steel is not really an option, as space and functionality come into plate. Thank you.





RE: ASME VIII High Strength Stainless
Of course I assume you are using the higher allowable stresses for 304.
It appears odd to me that a single lug is causing your problems: there are plenty of design solutions to lower the stress around a lug: pad plate, wider lug, change shape or position if bending moments are involved...
prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads
RE: ASME VIII High Strength Stainless
Agree w/ prex, there should be other ways.
Regards,
Mike
RE: ASME VIII High Strength Stainless
1) Check your material certificates for your 304 plate and see what the actual tensile strength is. You can use this as your value.
2) Check the strain at your calculated stress and see if its less then 2%. If it is your probably ok.
3) What stress is high, primary, secondary? How did you calculate your stress value?
Can you send a drawing or your calculations?
Thanks!
RE: ASME VIII High Strength Stainless
There is an interpretation out there that says that you may NOT use actual values for calculating an allowable.
And how do you justify 2)? Where in the Code is this permitted?
I would, however, second your question in 3). To the OP, what is your issue - what stress is excessive, and how will having a material with a higher yield impact your result?
RE: ASME VIII High Strength Stainless
Thanks for your information and clarification.
I understand the ASME Code and your point. I was not trying to answer the ASME Sec VIII code but rather what would work if your outside of the code rules already?
Why was the clip under designed per ASME Code Sec VIII in first place?
Thanks!
RE: ASME VIII High Strength Stainless
The only problems I am having is with the bending stresses in the lug itself.
I am currently considering the use of duplex as it offers the yield stress that works.
RE: ASME VIII High Strength Stainless
RE: ASME VIII High Strength Stainless