Mastering Wisconsin Plumbing
This podcast is dedicated to making the Wisconsin Plumbing Code (SPS 381–387) more accessible for plumbers, apprentices, inspectors, and designers.
Mastering Wisconsin Plumbing
Sanitary Drain Sizing
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In this bonus episode of Mastering Wisconsin Plumbing, Ryan explains how to properly size sanitary piping using the Wisconsin Plumbing Code (SPS 382.30). We break down fixture unit assignments, pipe definitions, and the correct application of Tables 2 and 3 for stacks, branch intervals, building drains, and sewers.
You’ll learn:
- How to assign Drainage Fixture Units (DFUs) for each fixture
- Key definitions: building drain, sub drain, sewer, stacks, and branch piping
- When to use Table 3 (building drains & sewers) vs. Table 2 (stacks & other piping)
- How to size stacks based on the number of branch intervals
- Tips to avoid exceeding allowable DFU loads on branch intervals
This video is perfect for apprentice plumbers, journeymen, and master plumbers preparing for exams or sharpening their skills in sanitary drainage system design.
📘 Code Reference: Wisconsin Plumbing Code SPS 382.30
