Olmedo,
I agree - I was making a general statement about how stress is defined in simple terms. However, TBP's reply is more in line with a real life reason for the Sch. 80 pipe being used in this application...
Good point TBP...
olmedo,
In answering your second question about Sch 80 pipe being used on <2" pipe is mainly due to the increased pipe wall stress on small diameter pipes (as well as corrosion, etc.) By definition "stress" is the ratio of Force to Area, i.e. S=F/A - therefore one can see that...
I am not a B31.3 expert, but way I see it; the code applies to "design conditions", however the design must be able to cover the full operational range of the material selected.
The code is not an operational or maintenance code - it is a "design" code. Your design temp as...