Engineering:Standard dimension ratio
From HandWiki
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.[1] Common nominations are SDR11, SDR17, SDR26 and SDR35. Pipes with a lower SDR can withstand higher pressures.
[math]\displaystyle{ SDR=\frac{d_o}{s} }[/math]
[math]\displaystyle{ d_o }[/math] Pipe outside diameter
[math]\displaystyle{ s }[/math] Pipe wall thickness
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