Standard dimension ratio

{{Short description|Method of rating a pipe's durability against pressure}}'''Standard dimension ratio''' ('''SDR''') is a method of rating a pipe's durability against pressure. The standard dimension ratio describes the correlation between the pipe dimension and the thickness of the pipe wall.<ref>{{Cite web|url=http://www.engineeringtoolbox.com/sdr-standard-dimension-ratio-d_318.html|title = SDR - Standard Dimension Ratio and S - Pipe Series}}</ref>

Common nominations are SDR11, SDR17, SDR26 and SDR35. Pipes with a lower SDR can withstand higher pressures.

<math>SDR=\frac{d_o}{s}</math>

<math>d_o</math> Pipe outside diameter

<math>s</math> Pipe wall thickness

==References== {{Reflist}}

Category:Piping {{civil-engineering-stub}}