What is the first step in sizing interior drainage stacks?

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The first step in sizing interior drainage stacks is to calculate the total fixture units. This calculation involves determining the cumulative demand of all the fixtures that will be draining into the stack. Fixture units provide a standardized measure of how much drainage load each type of plumbing fixture contributes based on its usage patterns. By calculating the total fixture units, a designer can effectively size the drainage stack to accommodate the anticipated flow and ensure proper drainage.

Sizing the horizontal branches or determining maximum flow rates are crucial steps that follow, but establishing the total fixture units is foundational. It ensures that the subsequent design elements align with the anticipated demands placed on the drainage system. Reviewing local plumbing codes is important for compliance but typically comes after determining the required sizing based on fixture units. Understanding this progression of steps is essential for successful plumbing design.

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