SDR meaning in oil and gas

Standard Dimension Ratio

(From a website: For Polypipe or plastic pipe: <p> Standard Dimension Ratio - SDR<p> It is common to use the "Standard Dimension Ratio" - SDR - as method of rating pressure piping.<p> The SDR is the ratio of pipe diameter to wall thickness and the SDR can be expressed as<p> <p> SDR = D / s <p> <p> where <p> <p> D = pipe outside diameter (mm)<p> <p> s = pipe wall thickness (mm) <p> <p> A SDR 11 means that the outside diameter - D - of the pipe is eleven times the thickness - s - of the wall. <p>