I was asked recently for a specific project how much flow the owner should anticipate coming from a building's main drain.
There's just a few factors that play into exactly how much water to expect. Is the drain serving as the main drain for a system? Is it only serving an inspector's test? Is the drain off a 1-inch pipe, or 2-inch? How much pressure is on the system?
These aren't often difficult to answer if you're familiar with the job, but each of these answers plays a role in determining how much water will come out of an open orifice.
This week I've simplified a few of these parameters to come up with a quick inspector's test and drain calculator for fire sprinkler systems.
With it, you can estimate the amount of flow that will come from an inspector's test (use the k-factor option) or from a drain (diameter option). For our international audience I have incorporated real units from the get-go this time. It's a free tool that's now live on the site, here.
Give it a spin and let me know what you think in the comments here.
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Thanks & have a great week!
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Joseph Meyer, PE, is a Fire Protection Engineer in St. Louis, Missouri. See bio on About page.