We've got a couple of projects where we're being required to do some pressure pipe modeling for our fire lines, like head loss / pressure (for example, what's going on at the fire hydrant if all the sprinklers are running & the toilets all get flushed at once). We're on Civil3d, and a differnt group in our company has Revit Structural. Does AutoDesk or any 3rd party vendor have a product that would do something like this?
(please forgive my ignorance... I'm from the land development side...)
How much are you trying to calculate?
Assuminmg the design loads are available from the people who designed the Sprinklers and Hydraulics, you should be able to calculate the effect on you hydrant main by hand (or spreadsheet).
If you dont have this info, perhaps you should start by requesting it.