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Theoretical Bursting Pressures * [PSI]
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* Barlow's Formula is a safe, easy method for finding the relationship between internal fluid pressure and stress in the pipe wall. The formula predicts bursting pressures that have been found to be safely within the actual test bursting pressure. Note that the formula uses the outside diameter of pipe and is sometimes referred to as the "outside diameter formula."

P =
2 x t x S


P = internal units pressure, PSI

S = unit stress, PSI

D = outside diameter of pipe, inches

t = wall thickness, inches

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