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How To Calculate Required Wall Thickness and Schedule of Pipe

In this post I want to share how to calculate minimum required wall thickness and schedule of pipe. Before we jump into calculation steps, let’s review what pipe schedule is.

Pipe schedule expresses thickness of pipe. It is not actual measurement, but as a guide based on wall thickness formula.

Two pipes with the same diameter may have different schedules, which means they have a different wall thickness. So, somebody specifying a pipe for a high-pressure application will select a bigger number which represents a bigger schedule or thicker wall.

I made a simple spreadsheet on how to calculate required wall thickness and schedule of pipe. I found that the calculation is quite mechanical. Maybe some process engineers, even me, do not really used to this calculation. The calculation involves allowable stress, weld quality factor, etc. I do not think all process engineers should understand about how to calculate pipe wall thickness. But it would be better if we do.

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