SDR 26 Pipe, Burst and Collapse

For the former I believe the claim is the pipe is good for field application of that amount of internal pressure (should not fail).
Not sure exactly what kind of spec sheet you are looking at for the latter, but the "7450" could be about the wall hoop or tensile stress level that could indeed cause a tensile burst or failure in psi (with rather rapid, not slow increase of pressure in the pipe).
Hope this helps.

Using the equation from the Plastics Institute I get an MAWP of SDR-26 built out of ASTM 3408 of 64 psig in water at 73°F and for natural gas at 100°F I get 16 psig. If I use the new "Vestimid" HDPE I get 128 psig and 32 psig respectively.

Not sure where the 160 psig comes from but I wouldn't believe it.

Burst pressure is a number that you can't really calculate since it is absolutely temperature and batch dependent. There are equations for collapse pressure, but I don't have them handy.



David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.

Are you referring to PVC pipe?

ASTM D2241 PRESSURE PVC PIPE is the standard. The burst pressure is 500 psi. Here is the link to the data from one manufacturer with the appropriate ASTM standards listed:

Sorry, I'd never seen PVC spec'd as SDR. Obviously it is just that I've never seen it since it is clearly on the link bimr provided.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.