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Minimum wall thickness of a valve (AWWA C504 and AWWA C516)

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Minimum wall thickness of a valve (AWWA C504 and AWWA C516)

(OP)
Hi,

I have been calculating the minimum wall thickness according to AWWA C504 which gives tabulated values for valves from 3 to 72" and I saw that for a 72" inches, the wall thickness must be greater than 60,3mm and then I moved to AWWA C516 to check the formula and I realized that for a 78" valve, the minimum value of the wall thickness according to C516 formula is 22,5mm (for a ASTM A536 ductile iron body material).

the minimum thickness of a valve according to C516 is:
t(mm) = ((P*D)/2S)+3,175 , where t = minimum thickness, P = design pressure rating, D = inside diameter, S = allowable stress.

Is there a (do you know) the formula that was used to make the table in C504? how did they get those exceedingly bigger values compared to C516?

Any help will be appreciated.
Thanks

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