Please enter your numerical values for 3 of the following 4 fields
Do NOT use commas for numbers greater then 999
You MUST click on the Clear Form button to perform additional calculations
P (internal pressure): psig
S (unit stress): psi.
t (nominal wall thickness): in.
D (outside diameter of pipe): in.

Barlow's Formula Calculator
Barlow's Formula - An equation which calculates the relationship of internal pressure to allowable stress, nominal thickness and diameter of pipe.

The formula is: P = (2*S*t) / D, where:
P = internal pressure, psig
S = unit stress, psi
t = nominal wall thickness, in.
D = outside diameter of pipe, in.
Peter Barlow
Self-educated, Peter Barlow (1776-1862) became assistant mathematics master at the Royal Military Academy, Woolwich, in 1801. He published numerous mathematical works, including New Mathematical Tables (1814). Later known as Barlow’s Tables, this compilation of factors and functions of all numbers from 1 to 10,000 was considered so accurate and so useful that it has been regularly reprinted ever since.
Peter Barlow ponders his formula and how it would be useful at Aerocom Speciality Fittings

Please Contact us at:
Tel: (514) 695-8883
Fax: (514) 695-7667
sales@aerocomfittings.com
Aerocom Specialty Fittings Inc.
16747 Hymus Blvd.
Kirkland, QC
H9H3L4


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