Then, look at an individual segment of pipe on your schematic and calculate how much BTU it needs for the appliance (or appliances) it’s connected to. Find the table that matches the type of piping you’ll be using, like Schedule 40 metallic pipe. X Research sourceĬompare the LMR of your pipes with the BTU of your appliances. For your own reference, mark down how long each pipe section is. Sketch out all of the gas appliances that your pipes connect to, and where the gas lines exit your home. As you study the logistics of your gas system, start creating a rough schematic for your new gas line.You’d measure the total distance of the furnace to the gas source to get your LMR. Let’s say that your gas line branches out to 3 appliances-a water heater that’s closest to the gas source, a dryer that’s second-closest, and a furnace that’s furthest away. Cross-reference your appliances with this table and mark down the different BTU inputs on your schematic sheet. X Research source Then, check your state’s plumbing code and look for a table labeled “Approximate Gas Input for Typical Appliances,” or something similar. Write this number down-you’ll need it to properly size your pipes. Take the segments of pipe that make up the longest branch in your system and add them together to get your LMR. The Longest Measured Run (LMR) is the longest branch of piping in your system. Find a copy of your state code on UpCodes to have as a handy reference. The size of your gas piping depends on both the length of the piping in your system and the total energy consumption of your appliances, which is measured in British Thermal Units (BTU). Be sure to download a copy of your state’s plumbing code, too, as different states have specific requirements for gas pipe sizing.You’ll likely have to pay a fee to get it.
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