In working out the maximum pressure that a tube can take before bursting, the most common approach is to use Barlow's formula. This formula is used to estimate the maximum internal pressure a pipe can withstand for a given material at given dimensions.
The formula is:
P = (2 x S x t) / D
P = internal pressure - in pounds per square inch gauge (psig)
S = unit stress - in pounds per square inch (psi)
t = nominal wall thickness measured in inches
D = outside diameter of pipe meeasured in inches
It is also possible to add in a safety factor to make the calculation to leave additional headroom before catastrophic failure. In this case the formula looks like this:
P = (2 x S x t) / (D x SF)
SF = Safety Factor Multiplier (commonly in the range 1.5 to 10)
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