Hi,
We have an 8" rusted ductile iron chilled water pipe we need to cut and couple it with PVC schedule 40 pipe and the pressure is 65 psi. What kind of coupling is good for this application? If there are no coupling for such an application then the pipes are very rusted and we will see if we can cut it and weld a flange to the pipe and then from there we can connect to a flanged PVC pipe, the question in this case is, what is the best way to weld on to a ductile iron pipe?