K.S. Taylor provided and excellent answer to this question on the Eng-Tips Piping board. I assume Nukie has seen it but I mention it here in case the reader would want to find it.
Hi jmagee - this is the ASME board. Look on the right, and you'll see "Related Forums". Piping, heat transfer, etc. There must be several hundred boards on this site, covering just about every type of engineering you can imagine. Valves, pumps, electrical, chemical, civil, it just goes on and on.
You can wind up spending a LOT more time on this site than you really should