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The SDR (Standard Dimension Ratio) for a pipe is calculated by dividing the nominal outer diameter (OD) of the pipe by its wall thickness. The formula is SDR = OD / Wall Thickness. For example, if a pipe has an outer diameter of 10 inches and a wall thickness of 0.5 inches, the SDR would be 10 / 0.5 = 20. This ratio is used to indicate the strength and pressure rating of the pipe, with lower SDR values indicating thicker walls and higher pressure capacity.

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1w ago

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