The lower, non-editable sections of the Size Sanitary Plumbing Line dialog box provide you with the final sizing calculations.
Sanitary Branch Sizing
If you based the sizing on branches, the Size Sanitary Plumbing Line dialog box displays the results of the sizing for the branches in the drawing.
The Fixture Units Upstream value is the result of all connected fixtures in the drawing. This value assumes that all connected fixtures are in the current drawing. Once the Fixture Unit Upstream value is defined, the software calculates the value for Size of Branch.
Sanitary Offset Sizing
If you based the sizing on offsets or home drains, the Size Sanitary Plumbing Line dialog box displays the results of the sizing for the offsets and home drains in the drawing.
The Fixture Units from Upstream Stack value is the result of all connected fixtures in the drawing. To calculate this value, in Fixture Units from Branches Connecting Outside of this Drawing, enter the calculated sum from the floor above. When working with a multiple story building, the drawing for each floor in the sanitary waste system should be saved in a separate file and must be calculated separately. For more information, see Sanitary Pipe Sizing for Multiple Floors.
Once the Fixture Unit Upstream Stack value is defined, the software calculates the value for Size of Plumbing Line. You can also view the slope of the selected plumbing line in Slope of Plumbing Line.
Sanitary Stack Sizing
If you based the sizing on stacks, the Size Sanitary Plumbing Line dialog box displays the results of the sizing for the stacks in the drawing.
The Fixture Units from Branches Connecting in this Drawing value is the result of all connected fixtures in the drawing. However, when working with a multiple story building, typically each floor is saved in a separate drawing file. To accurately size the sanitary system for each floor, you must size the sanitary system for each floor separately, working downward. For each floor, in Fixture Units from Branches Connecting Outside of this Drawing, enter the Fixture Units from Branches Connecting in this Drawing value from the floor above. For more information, see Sanitary Pipe Sizing for Multiple Floors.