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.
Common nominations are SDR11, SDR17 and SDR35. Pipes with a lower SDR can withstand higher pressures.
S D R = d o s {\displaystyle SDR={\frac {d_{o}}{s}}}
d o {\displaystyle d_{o}} Pipe outside diameter
s {\displaystyle s} Pipe wall thickness
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