Fixture Units to Flow (GPM) Conversion

Revit performs a general conversion from fixture units to flow, using the values found in the 2006 International Plumbing Code (IPC), Table E103.3 (3). The flow conversion method selected in the Instance Properties dialog for the selected system determines the section of the IPC table used for the conversion. The resulting flow is used to calculate pipe sizing.

The value calculated for flow can be helpful in sizing the branch piping for subsystems. However, when specifying sizes for the main piping, you should consider a variety of other factors, such as:

• the type of system,
• the type of building,
• peak demand,
• available supply pressure,
• the pressure required at the highest fixture,
• limitations imposed by the local authorities,
• selected fixtures,
• and the supply source.

Note: The 2006 International Plumbing Code, Appendix E, provides detailed information that must be considered when planning a plumbing system.