ASME II Part D - Allowable Stress
ASME II Part D - Allowable Stress
(OP)
Hi everyone I'm new on this thread.
Thanks in advance to all people who will give me their valuable feedback.
Regarding allowable stresses stated in ASME II Part D 2021 Edition,
I'm trying to understand when values tabulated into tables shall be used and when it is possible to calculate values with the criteria stated in the Mandatory Appendix.
Specifically, I'm looking at how to determine allowable stress for ASTM A193 B7M bolts.
ASME II Part D Table 3 (applicable for ASME VIII Div.1) states the allowable stress of 138 MPa,
but applying the criteria described in Mandatory Appendix 2 Table 2-100(b) the calculated value is 172.5 MPa.
Since the Mandatory Appendix 2 gives the criteria to establish values for ASME II Part D Table 3,
I'm not understanding why values are different and what is the reason to use one or the other.
thanks again for your help
Thanks in advance to all people who will give me their valuable feedback.
Regarding allowable stresses stated in ASME II Part D 2021 Edition,
I'm trying to understand when values tabulated into tables shall be used and when it is possible to calculate values with the criteria stated in the Mandatory Appendix.
Specifically, I'm looking at how to determine allowable stress for ASTM A193 B7M bolts.
ASME II Part D Table 3 (applicable for ASME VIII Div.1) states the allowable stress of 138 MPa,
but applying the criteria described in Mandatory Appendix 2 Table 2-100(b) the calculated value is 172.5 MPa.
Since the Mandatory Appendix 2 gives the criteria to establish values for ASME II Part D Table 3,
I'm not understanding why values are different and what is the reason to use one or the other.
thanks again for your help
Talk To Other Members
RE: ASME II Part D - Allowable Stress
I have the customary tables, but.
(b) For materials whose strength has been enhanced
by heat treatment or by strain hardening, the allowable
stress value shown at any temperature in Table 3 is the
least of the following, unless these values are lower than
the annealed values, in which case the annealed values
shall be used:
(1) one‐fifth of the specified minimum tensile
strength at room temperature;
(2) one‐fourth of the tensile strength at
temperature;
(3) one‐fourth of the specified minimum yield
strength at room temperature;
(4) two‐thirds of the yield strength at temperature.
RE: ASME II Part D - Allowable Stress
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: ASME II Part D - Allowable Stress
RE: ASME II Part D - Allowable Stress
I'm still trying to understand why the calculated value seems different from the tabulated one even if the criteria should be the same.
B7M tabulate value (allowable) is 138MPa (20'000 psi)
B7M calculated value (allowable) 172.5MPa (20'000 psi)
I'm working with ASME VIII Div.1 and I'm checking allowable for ASTM A193 B7M to calculate a flanged connection (ASME VIII Div.1 - Appendix 2)
Regards
Manuele