Fixture units on vent piping system

[Anonymous]

Revit is based on IPC which sizes vent piping based on fixture units, but for some reason the vent piping system does not have fixture units.  To be able to get a fixture unit count you either have to manually enter the numbers which is a headache if something changes (what project does not have changes?) or do the system as a sanitary system called vent.  Using a sanitary system can easily have problems combining the 2 systems with the slightest error.

So my idea is to add fixture units to vent piping system like they should have been from the start.

[timmywitt]

Yes, similarly there are a ton of systems that we use that could use a generic calculation value.

We currently use the Sanitary system classification to calculate sanitary, grease, garage drainage, vent, storm, and overflow.

We use Domestic Cold Water for domestic cold water, industrial cold water, pure water, RO water, softened water, and similar.

We use Domestic Hot Water for domestic hot water, industrial hot water, tempered water, tepid water, recirculated hot water, and similar.

After that it gets weird, since most of the other systems can't calculate or are used by our mechanical disciplines. We end up using a lot of Domestic Cold Water duplications for things like natural gas, oxygen, vacuum, compressed air, and other random systems where we could use a tracked load value. 

It definitely feels like there is room for improvement here, even if we could just get the "Other" system classification to be able to track flow and fixture units and such.