1/2/2023 0 Comments Pex sizes gpmCalculate the elevation of the highest fixture If you’re following our video, our resulting number is 115 feet. Now, just trace back to the meter, adding up the length of the center line as you go. In our example, that fixture would be the upstairs shower. That total distance is called the developed length.Īgain, the most remote outlet means the fixture in the house that’s farthest from the meter. We do this by tracing back along the center lines of the pipes until we reach the meter. In other words: the fixture that’s the farthest away from our meter. The next thing we need to do is calculate the developed length from the farthest remote outlet. Now? We add it all up: 16.5 water supply fixture units in total. And since our upstairs example mirrors the downstairs, we can simply duplicate the numbers for that. Keep in mind is the minimum fixture branch pipe size is also listed on this table - these fixtures cannot be supplied with anything smaller than what’s in that column.Ĭontinuing on: the lav is 1 WSFU and the toilet is 2.5. Now let’s look for our kitchen sink: “Kitchen, domestic with or without dishwasher” is what we want, which is 1.5 WSFU. Starting with the bathtub combination, we see that water supply fixture units (WSFU) is 4. In our example, we’re a private residence. When you’re calculating the total fixture units, decide if you’re the “public” or “private” column first. Each fixture is assigned a value from a table in the 2018 Uniform Plumbing Code on how much demand it puts on that system. The first thing we need to do is calculate our total fixture units, which is essentially how much demand we have on the water system in the house. Developed length of the most remote outlet.To size the meter, we’re going to need four key bits of information: (The blue represents the cold water lines and the pink our hot water lines.) In our example in the video, we have our water meter connected to a kitchen sink, a bathroom group downstairs (which comprises a lav, toilet, and shower), and a bathroom group upstairs with the same fixtures. Our main task is sizing our water meter or verify that our existing water meter has capacity to expand on whatever project we’re working on. If you’re making an addition or starting from scratch, this tutorial should be a big help. This blog post will cover the steps to our preferred method, using the 2018 Uniform Plumbing Code. Knowing how to size your water lines ( PEX or copper) is essential if you’re a DIYer or new to the plumbing trade.
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