SA-516 Gr. 70 stress values for AS1210

[Frohnert]

Hello,
Does anybody know which allowable stresses are permitted for an AS1210 vessel, e.g. made from 516 Gr.70?

Clause 3.3.9 says, "A factor of 3.5 may be used with the value Rm to determine the design tensile strength." I can go to Appendix A to establish the allowable stress values.
A new paragraph added to Appendix A (amendment) says, not listed materials "may be used with the design strength permitted by ... VIII-1 provided that the design strength does not exceed Rm/4 except as permitted by clause 3.3.9."

That´s a little bit confusing, for sure a lack of understanding from my side. To make it short: am I allowed to use the stress values from ASME Sec. II, Table 1A, or do I have to use RM/4 and Yield/1.5 for 516 Gr.70 under AS1210?

Any feedback would be welcomed.

michger

http://www.OneTB.com

 

[gr2vessels]

AMDT No 2, Sept 1998, on page 290, the new footnote says "*Rm/4 may be replaced by Rm/3.5 under the conditions given in Clause 3.3.9"
Please also note that the page 290 has been extensivelly modified, to accommodate the 3.5 factor for other materials like ASME SA 516 gr 70.
Cheers,
gr2vessels

 

[wjp123]

Hi michger,
I agree with grvessels.
I design a lot of vessels to AS1210 and all materials listed in Table 3.3.1 may be used with he new allowable stress based on UTS/3.5.
Or to make things easier for ASME materials, just use the allowable stress listed in ASME Section II Part D
I hope this helps.
Cheers,

 

[wjp123]

Hi michger,
I've forgot to mention that the higher allowable stress may not be used for transportable vessels, bolting and flanges.
However, the allowable stress for flanges is currently under review to correspond with ASME VIII Div.1
Cheers.