Allowable stress values in ASME sec.II D & ASME B31.3
Allowable stress values in ASME sec.II D & ASME B31.3
(OP)
Dear all,
My concern is about allowable stress values mentioned in table-1A of ASME secII D and one that is mentioned table A-1 of ASME B31.3,
I was checking allowable stress value for SA-106 gr.b in sec-II D and in ASME B31.3 and i found different values in both place,
In ASME sec2 pard D it is mentioned as 17100 psi for lowest to 100°c,
and 20000psi in ASME B31.3.
All I want to know is what is the difference and which should be used when,
Reason i m asking this if i can use higher allowable stress values for design i can design for lower thickness.
My concern is about allowable stress values mentioned in table-1A of ASME secII D and one that is mentioned table A-1 of ASME B31.3,
I was checking allowable stress value for SA-106 gr.b in sec-II D and in ASME B31.3 and i found different values in both place,
In ASME sec2 pard D it is mentioned as 17100 psi for lowest to 100°c,
and 20000psi in ASME B31.3.
All I want to know is what is the difference and which should be used when,
Reason i m asking this if i can use higher allowable stress values for design i can design for lower thickness.





RE: Allowable stress values in ASME sec.II D & ASME B31.3
However, ASME B31.1 or B31.1 or B31.8 are standards committees and they can provide their own factors that are more conservative than Section II. If the allowable stress values are more conservative than Section II valves, you are required to use the more conservative values IF the code of construction requires more conservative values.
RE: Allowable stress values in ASME sec.II D & ASME B31.3
If you're building piping to ASME B31.3, use the allowables from ASME B31.3.
If you're building an ASME VIII-1 pressure vessel, use the allowables from ASME IID.
Simple as that.
RE: Allowable stress values in ASME sec.II D & ASME B31.3
can i find some were in the code factors considered for allowable stress
RE: Allowable stress values in ASME sec.II D & ASME B31.3
"Whom the gods would destroy, they first make mad "
RE: Allowable stress values in ASME sec.II D & ASME B31.3
Review Mandatory Appendix I in Section II Part D and review Note 1 of Appendix A Tables in B31.3.
RE: Allowable stress values in ASME sec.II D & ASME B31.3