The Structural Engineer's Corner

Eng. Onorio Francesco Salvatore

OFS Pipe Stiffness – software for pipe classification in rigid / flexible type

Written By: Francesco Salvatore Onorio - May• 20•12

In this post I wish to present you a software for buried pipes / buried pipelines classification. In “Buried pipelines I – rigid versus flexible pipes and pipelines” we talked about rigid and flexible pipes and we’ve seen how different are this two groups when referring to structural checks.

Structural Engineers need to classify buried pipes and pipelines in order to understand which kind of analysis to perform: stress checks or deflection checks.

OFS Pipes Stiffness gives you the right way for your structural checks. It analyzes your inputs and defines rigidity of pipes.

When you first run it, a splash screen appears. It’s just a quick intro.

Then you can reach the calculation screen:

Let’s make an example. With these inputs:

Diameter, D = 1200 mm

Pipe thickness, s = 87 mm

Pipe modulus, Em = 20000 MN/m²

Soil modulus, Es = 150 MN/m²

We have:

SDR = 13.79

n = 1.54 > 1

So, the pipe is FLEXIBLE and you need to control deflection.


Let’s make another example. With these inputs:

Diameter, D = 1200 mm

Pipe thickness, s = 87 mm

Pipe modulus, Em = 20000 MN/m²

Soil modulus, Es = 15 MN/m²

We have:

SDR = 13.79

n = 0.154 > 1

So, the pipe is RIGID and you need to control stresses.

Download OFS Pipe Stiffness at just 2.99 € !


Do you need a complete software for buried pipe analysis? Do you need to check deflection, control stresses, calculate static loads, traffic loads, hydrostatic loads and so forth?

Check this: PROCOID (only in Italian language, at the moment).

For guidance, reports and more you can contact the author at:

Eng. Onorio Francesco Salvatore

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