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I was hoping to find any answer to express the meaning of shring " Knowledge, Experience" .
But i'll briefly explain the importance of SDR Expression.
SDR means "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 SDR11 means that the outside diameter - D - of the pipe is eleven times the thickness - s - of the wall.
As a consequence a high SDR pipe has a low-pressure rating and low SDR pipe has a high-pressure rating.