# Calculate deflection of pipe

• 01-29-2018, 12:43 PM
tspathias
Calculate deflection of pipe
Hello,

What is the best way to calculate the max deflection of a 35" span of 3/4" pipe undergoing a max load of 200 lbs at the center? The pipe is supported at both ends. Assume a standard carbon steel 3/4" s/40 pipe in accordance with ANSI B36.10

Outer Diameter: 1.05"
Inner Diameter: 0.824"
Pipe weight per foot: 1.13 lbs

Thank you
• 01-29-2018, 06:56 PM
Kelly Bramble
With this equation and calculator:

[url]https://www.engineersedge.com/beam_bending/beam_bending2e.htm[/url]

[url]https://www.engineersedge.com/beam_bending/calculators_protected/beam_deflection_2.htm[/url]
• 01-30-2018, 02:19 PM
jastewart
Kelly has you a starting point, but you will need to plug-in the Modulus of the steel being stressed. Also, perhaps I am wrong, dead wrong, but it would appear to me the cross-section of the steel determines its flexure resistance also, or we would build everything from pipes and not I-beams.