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...
Thanks a lot for your answers.
@eeromatti
The curves for ferritic steels you are refer to deal with "ferritic and martensitic steels", the product no. of these materials are 1.4xxx and these are not carbon steels like 516-xx you know from Sec. II. Therefore you cannot use these curves for carbon...
Please read a little bit further. In 26.6.6.3.2 for the fatique analysis (which is the important matter for the expansion joint) is written:
"The following equations are valid for:
(a) austenitic chromium-nickel stainless steel, UNS N066XX and UNS N04400 ..."
That´s it. No equations for carbon...
Correction: Not austenitic steels are permitted in the current Code, but only Nickel/Nickel Alloys.
The carbon and low alloy steels were allowed in the 1998 Edition, however disappeared in the Add. 00 where only high alloy and the above mentioned nickels remained.
Has anybody an idea why...
Hi
In former times it was possible to calculate expansion joints made from carbon steel according to Appendix 26. Since today only austenitic items can be calculated with this rules, I would like to know which rules you guys apply to perform a calculation of an expansion joint according to...
I think it´s only relevant when the attached flange makes troubles and the manufacturer wants to get rid of the problem. Normally we always consider the flange as a part of the vessel and within the scope of the ASME Code.
Nevertheless, it´s not forbidden by the Code to consider the flange as...
Scesare:
Another solution is to perform a calculation of your flanges for 153barg@100°C. If they are adequate dimensioned you are allowed to use them for the specified pressure.
