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What is the Standard Dimension Ratio (SDR)?

April 26, 2017dimension ratio SDR standard

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What is the Standard Dimension Ratio (SDR)?

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In European standards the notion of nominal pressure “PN” is being largely abandoned. Instead, the pipe series number “ISO-S” and the standard dimension ratio “SDR” are being emphasised. This ratio is indicated in the form of an SDR mark (standard dimension ratio). Within a pipe series, this SDR number is constant and corresponds to the value of the rounded outside diameter of the pipe divided by the wall thickness of the pipe. Check our Specification Manual on standards.