Steel stack design, materials properties

[vaanys]

For my internship I'm doing some research on steel stacks. I am currently using ASME STS-1 for design information, but I was trying to find steel properties (yield and tensile strength, maximum allowable stress, ..), especially temperature dependent ones. I found out that ASME Boiler and Pressure Vessel Code contains a lot of these data, but I am unsure of which table in Section II D is the most useful.
I am working on steel stacks used for gas turbine exhaust gas.

Thanks for your help!

 

[JStephen]

Usually, the whole Section II Part D all comes together, so just get it and check the table of contents.
Note that the allowable stresses in there are for vessel use, and may be overly conservative for a stack. Also, the materials covered are what is typical for vessel use, but don't necessarily cover every "structural" material.
For gas turbine exhaust, I'd want to check with people that have done similar work as to any vibration issues.

 

[dhengr]

Vaanys:
Get a copy of “Tubular Steel Structures, Theory and Design,” by M.S. Troitsky, from the Lincoln Arc Welding Foundation. It’s a real good ref. text and not too pricey either. Allowable stresses are a function of the design code you are using, which is usually dictated by the local authorities having jurisdiction (AHJ). You should get your material mechanical properties, Fy, Fu, etc. from the material’s ASTM specs. for that material, or other country’s similar stds. If there is no local code, pick a well recognized code which you are comfortable with, learn to understand its workings and rational, learn to use it well and defend it, then go for it. The idea that codes and stds. might change for every two-bit jurisdiction is really kinda silly; after all, the theories of Physics, Theory of Elasticity, Engineering Mechanics, etc. do not really change at boarders, do they? I’m not bashful about taking the best of several good codes, studying their differences and reconciling them, and using parts of both/all in my designs, as long as I can defend them. I’m sill a big believer that some experienced engineering judgement is quite appropriate in our functioning as design engineers. The small differences in allowable stresses from code to code, many small differences in the good codes, for that matter, small stress excursions above the allowables are rarely the cause of failures. But, poor details, lack of attention to details and understanding why one works and another is inferior, and for what reasons is absolutely essential. Inferior details or workmanship, and lack of understanding how the structure actually works are more often the cause of failures.

 

[vaanys]

JStephen:
Thanks for the answer. I will use Section II D as a "rough guideline", and I will ask my colleagues about the vibration issues you mentioned.

dhengr:
Thanks for your advice! I will check the book you mentioned. All the similar but slightly different data I have found during my research confused me a little, but you are right, these small differences will not determine the failure of the material. Your advice will help me with my critical thinking as an engineer.