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period of straight steel stack

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I am calculating the period of a straight steel stack.  Short fat and heavy, my gut says “rigid” for the wind load definitions, but I thought I would check just to make sure.   Equation 5.17 on page 5-6 of “Tubular Steel Structures” from Lincoln Welding there is an equation: T=765E-6 x (H/D)^2 x [(12 x w x D)/t]^.5 .  I also have a copy of “Pressure Vessel Handbook” which has a formula T=.0000256 x (H/D)^2 x (w x D /t)^.5 .  It appears that the Lincoln formula should be ”7.65E-6 x …..” not “765E-6….”   Or the Pressure Vessel Handbook is off.  That is a difference of 100.  At this point I tend to lean towards the Pressure Vessel Handbook formula due to other formulas in the Lincoln book.  But I could be wrong.

 

Can anyone out there confirm this?

 

Thanks,

Joe

 

Joseph R. Grill, PE