SDR calculation
SDR calculation
(OP)
How do you calculate the SDR of a pipe for a pipe network? I presume there are charts available but I dont know how to get these.
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RE: SDR calculation
http://www.uni-bell.org/
http://www.uni-bell.org/faq.html#q4
RE: SDR calculation
The SDR is:
SDR=(Pipe Outside Diameter/Pipe Wall Thickness)
The pipe wall thickness is calculated from a pipe wall stress analysis. The approach below is from the Wavin technical catalogue:
Hoop Stress = (P/2)*(SDR-1)
Where P is maximum pressure.
An allowable pressure (PFA) can be calculated as follows:
PFA = (2*MRS)/(alpha*(SDR-1))
Alpha is a design factor. Wavin use 1.25.
MRS is minimum required strength. PE80 is 8MPa and PE100 is 10MPa at 20 celsius for a 50 year design life.
http://www.wavinpdfs.co.uk/pdfType.asp?id=6
RE: SDR calculation
Thanking you both kindly. Appreciated.