Summary: Not all pipe fittings and accessories for a given pipe type have flange connections. Flange connections should be defined at the pipe connector on the family
Description: It is not uncommon to have a piping system where the fittings have a different connections type from the pipe accessories. Elbows and tees might be welded connections yet the valves and other piping accessories might require flange connections.
Currently if you define a pipe type in Revit MEP with a Connection Type of Flanged, Revit will insert a flange between every connection between pipe and fittings or accessories. If the Connection Type is not Flanged and you manually place flanges, some modifications to the piping will remove the flanges.
It is the pipe connector in the family that should be driving the flange connection type since the family is built for the connection type. The pipe connector parameter should also be able to be linked to a family parameter to control connection type through parameters.
Product and Feature: Revit MEP - MEP Pipe (Rigid
Submitted By: Joe Fields on 07/24/2012