Standard Dimension Ratio - SDR

It is common to use the Standard Dimension Ratio - SDR - as method of rating pressure piping

pe pipe pressure range sdr

Many PE pipe manufacturers use the "Standard Dimension Ratio" - SDR - method of rating pressure piping. The SDR is the ratio of pipe diameter to wall thickness and the SDR can be expressed as

SDR = D / s         (1)

where

D = pipe outside diameter (mm)

s = pipe wall thickness (mm)  

A SDR 11 means that the outside diameter - D - of the pipe is eleven times the thickness - s - of the wall.

  • with a high SDR ratio the pipe wall is thin compared to the pipe diameter
  • with a low SDR ratio the pipe wall is thick compared to the pipe diameter

As a consequence a high SDR pipe has a low-pressure rating and low SDR pipe has a high-pressure rating.

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Edition - Online 3D modeling!

3D Engineering ToolBox - draw and model technical applications

Engineering ToolBox - SketchUp Edition - enabled for use with the amazing, fun and free Google SketchUp

Translate the Engineering ToolBox
About the EngineeringToolbox