Could anyone provide information or a source for "universal pipe flanges"?

There are called Socket-Weld and Slip-On flanges.  Pipe schedule is immaterial, and makes the flanges "universal".

I think, if you check the exact bolt hole dimensions on ANSI and DIN flanges, you will find that they can be bolted together face to face, with the exception of some 2" flanges where bolt clearence becomes tight, but I think that even though tight, the bolts can still be inserted. Check the exact dimensions of the specific case you have before making any special spools.

Gator, It's probably going to be a situation where the flanges are at a unit or plant limit that also comes with a code break at the same place, which is common when connecting between European and American companies in various parts of the world where there is no national requirement and one code is thought to be just as good as the next.  As long as you used A code, it was legal.  I've even had requirements for DIN on the pump stations and ANSI on the pipelines when connecting between defense ministry and national oil company facilities.  

6" and 8" are about the only sizes where you might be able to bolt a 150# flange to a PN10/PN16 flange with a full sized bolt (and a mallet).  You may be able to get some of the smaller flanges together using undersized bolts, but that would be a sure code violation.  At 3" a 150# flange has 4 bolt holes while the DIN PN10 flange has 8.

Apart from the problem of bolting the flanges together, there is the problem of wafer type fittings like butterfly valves and disk check valves trying to fit inside differing bolt circles.  Mixed standards are by no means rare here in South Africa, and it can be a nightmare if it is not very carefully managed.

My advice - forget about universal flanges and just do it properly.

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