I read a post at RFO that said the value for Fixture Units added up along a pipe run were correct at the pipe (in properties) but that tags attached to those pipes did not report a matching value. My first thought was that the system’s Calculations parameter was assigned to something other than Flow. So I mocked up a quick test (using version 18.1.1.18 – 20170907_2315(x64) – 2018.1.1). Three families, two with the same Fixture Units assigned and one rogue.
I changed the middle fixture to be the same as the outer two and the pipe properties responded, the tag didn’t (2nd from left). I took a look at the Calculations parameter for the Sanity Piping System. This is using a stock Imperial Plumbing template. It’s already set to Flow.
I switched it to None, clicked Apply, and the tags responded with this (Performance does the same).
I changed it back to Flow, clicked Apply, and the tags…