What does SDR stand for?

Standard Dimension Ratio (pipe specification; ratio of diameter to wall thickness)

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Sonar Data Recorder Sony Dream Robot Source Directed Requirement Spatial Data Repository Spatial Diversity Receiver Special Drawing Rights (of the International Monetary Fund) Splash Detection Radar Spoken Document Retrieval Staged Data Repository Standard Diameter Ratio (pipe)		Standard Direct Receiver Standard Distribution of Resistance Standard Drawing Rights Standardized Death Rate (cancer) State Department Request State-Dependent Routing Statistical Data Recorder Stop Drop and Roll Storage Data Register Strange Dave Rosenberg (Long Island, New York band)

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The change in standard dimension ratio, which relates pipe wall thickness and outside diameter, sees the heavier SDR11 product replaced by SDR13.