Here is some data from one supplier.  This might be good if you know 
exactly what type of pipe you are buying.
http://www.hollaender.com/files/1/Tech_Data/handraildesign.pdf
Jerry, K4SAV
K7LXC@aol.com wrote:
> Howdy, TowerTalkians --
>  
>     While steel pipe isn't rated for strength, I've  seen a yield figure of 
> 25 or 30,000 psi. I think it was even mentioned on TT but  I couldn't find it 
> in the archives. Does anyone have a reference for it? Really  appreciate your 
> help.
>  
> Cheers,
> Steve     K7LXC
> TOWER TECH 
> **************Stay up to date on the latest news - from sports scores to 
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