Internal Pressure Capacity of a Pipe Calculator

This online calculator is used to find the capacity of pipe to safely withstand to internal operating pressure.


Barlows Formula or Pipe Maximum Internal Formula:

Barlows Formula is used to show the relationship between internal pressure, Stress, wall thickness and outside diameter.

P = 2StD


P - pressure in kPa

S - stress in mPa

t - wall thickness in m

D - outside diameter in m