Barlow's Formula

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Barlow's formula, abbreviated as Ba, relates to burst pressure, the point just before or at when a pipe or tubing fails under pressure.

 

Barlow's formulas

\(\large{ p =  \frac{2 \; S \; t}{D} }\)   
\(\large{ p =  \frac{4 \; S \; t}{ D \;+\; 2 \; t } }\)  
\(\large{ p =  \frac{2 \; S \; t}{ \left(D \;-\; 2 \; t \right) \; SF  }  }\)  
\(\large{ p =  \frac{2 \; S \; t}{D \; SF} }\)  

Where:

\(\large{ p }\) = pressure

\(\large{ S }\) = allowable stress

\(\large{ D }\) = outside diameter of pipe

\(\large{ t }\) = pipe thickness

\(\large{ SF }\) = safety factor (generally 1.5 - 10, 1 for bursting pressure)

Solve for:

\(\large{ t =  \frac{ p \; D }{2 \; S \; SF} }\)   

Tags: Equations for Pressure Equations for Pipe Sizing Equations for Pipe