The plumbing line sizing feature relies on 2 types of plumbing line sizing tables (also referred to as pipe sizing tables) when performing sizing calculations:
- Supply plumbing line sizing tables specify the equivalent plumbing line length values for fittings and valves.
- Sanitary plumbing line sizing tables specify the maximum permissible fixture unit loads for different types of sanitary runs (stacks, branches, and offsets).
The proper reference and use of plumbing line sizing tables are essential to accurate plumbing line sizing. If you plan to do sizing, you should first identify the plumbing line sizing tables to use and verify their accuracy.
AutoCAD MEP 2025 toolset includes sample sizing tables for supply lines and for sanitary lines, based on industry standards. However, you or your CAD manager can create your own sizing tables that meet your project requirements and conform to applicable codes. You can use the sample tables as guides for creating your own tables.