As a firm we are pushing the use of Revit for services engineering design quite hard. I'm well aware some of our competitors are doing likewise. An area that currently lets us down is the use of fixture units to establish diversity for plumbing pressure pipes, so we can size the pipes based on the reduced design flow. The problem is that the built in conversion table (IPC) is an american standard and is not valid in most jurisdictions outside of the US. Infact its only valid in 35 states within the US. "The International Plumbing Code (IPC) is in use or adopted in 35 states, the District of Columbia, NYC, Guam, and Puerto Rico" Source; http://www.iccsafe.org/international-code-adoptions/ Some people are going to great lengths to establish workarounds, such as in this blog post; http://www.revit.com.au/sizing-as3500-compliant-pipework-using-revit-part-1/ For pressure drop, we have a choice of 3 different formulae, but for flow there is only the one option. Is it possible to add some internationally recognised fixture unit conversion tables? Ideally for an early Revit 2018 dot release. We can work with either the Brittish IOP Guide (https://www.thenbs.com/PublicationIndex/documents/details?Pub=IP&DocId=305635) or Australian Standard AS3500 as they are quite similar. Currently we have to train our engineers that some calculations can be done with Revit, but others give the wrong answer. This is messy & encourages the idea that Revit shouldn't be used for calculations at all.
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