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High quality Polyethylene Pipes & HDPE Pipes technical guidance

SDR PIPE - MOP Calculator

Quick access

How to use the calculator ?

Select the External pipe diameter, MRS, C and either the SDR OR a value for the MOP.

If you select the SDR, the MOP is calculated or if you enter a MOP value, the SDR is calculated. When the SDR is calculated the MOP may be recalculated for the this SDR.

Values for the internal pipe diameter and the wall thickness are calculated automatically.

Disclaimer

By using the calculator, you acknowledge and agree to the terms of the disclaimer.

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Created Thursday 07 February 2013
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What is SDR pipe and how does it influence the pressure rating of the pipe?

The SDR pipe is the "Standard Dimensional Ratio" and refers to the geometry of the pipe. SDR is defined as the ratio of the nominal outside diameter to the nominal wall thickness. SDR = dn/en Where dn is the nominal outside diameter of the pipe and en is the nominal (minimum) wall thickness of the pipe. Therefore a higher SDR indicates a thinner-walled pipe at any given diameter. The relationship between the SDR and the pressure rating is given by Lames formula for the hoop stress in thick wall...

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