SA-264 Maximum Allowable Working Stress
SA-264 Maximum Allowable Working Stress
(OP)
Seems like I've been chasing my tail through the code or may be it's just that I can't quite see the forest for the trees. I'd like to be able to determine the Maxmum Allowable Stress for the following.
SA-264; 20% SA-240 316 on SA 285 backing, Specified Tensile strength; 55K. Nominal thickness 0.375", Temp. 600. Ultimately I'll be using the stress to calculate the min. thickness for the heads and shell.
I've been through UCL-11 and UCL-23(c) seems like I get close but just can't quite get to where I need to be. New to this site. Sure hope someone can set me on the right course. Many Thanks in advance.
SA-264; 20% SA-240 316 on SA 285 backing, Specified Tensile strength; 55K. Nominal thickness 0.375", Temp. 600. Ultimately I'll be using the stress to calculate the min. thickness for the heads and shell.
I've been through UCL-11 and UCL-23(c) seems like I get close but just can't quite get to where I need to be. New to this site. Sure hope someone can set me on the right course. Many Thanks in advance.





RE: SA-264 Maximum Allowable Working Stress
RE: SA-264 Maximum Allowable Working Stress
RE: SA-264 Maximum Allowable Working Stress
From the Form U-1; SA-264...20% Type 316 on SA-285 Backing (T.S.=55k) Nominal thickness .375"
therefore the SA-285 is a Grade "C",S=15300 @ 600F and for SA-240 316, S=12,600 @ 600F.
From UCL-23(c), t(nominal thicknes base) + (Sc/Sb x t(nominal thickness cladding)
0.300" + [(12600/15300)x 0.075"] = 0.362"
Comments????
Thanks
RE: SA-264 Maximum Allowable Working Stress
Regards,
Mike
RE: SA-264 Maximum Allowable Working Stress
You can include it in the strength calc as the combined thickness you show, as long as clad will not wear out in 20 years.
If you are not sure, just treat it as corrosion allowance, make your life easier as SnTMan says.