Hi, I am doing a conceptual design for a pipeline using three different pipe materials (PVC, HDPE, and ductile iron) - and I am not a materials guy and I apologize for my basic question. My question is in regards to what the definition of Special Class is for ductile iron piping. I have attached a file where I have highlighted in red the various special classes and in blue I have highlighted where there no special classes. I have looked without success on why there are different pipe classes for the same pressure class of pipe (if they have the same pressure rating, why does the wall thickness increase for each special class? - my assumption is it is related to depth of bury and the higher the special class, the deeper the pipe can be buried). And my other question is why is there a "-" in the special pipe section with an associated nominal wall thickness? If there is a "-" does this mean that I should ignore the associated nominal wall thickness and use one of the special classes or what??
thanks for your help.
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