Our website uses cookies. Our website captures some information about you automatically utilizing background local storage and We operate social media pages on third party networks and have social media icons on our website. Theoretical Discharge through Circular Orifices Formula. Step 2: Square the measured diameter. The outlet is smooth and rounded, meaning it has a coefficient of 0.9. But in reality, the equation and chart can be confusing—and QRFS phones are constantly ringing with the question: How do I do this right? information Previously, we’ve offered a detailed guide on how to use a pitot gauge for hydrant flow testing. Since pressure is derived from force and area, many units for pressure directly relate force to area. visit and details of your transaction activity, such as the amount, date and time for each Click the window of the units to convert from and choose the units. to third parties where required by law or to the extent that third parties process these data on In this blog, we will take you step-by-step through the process of converting a pitot gauge’s PSI reading to GPM. Different manufacturers have different internal hydrant orifice designs, and friction is created as water is required to go around bends or sharp corners. While testing a single fire hydrant, here’s what we found: So, what’s the total GPM available at normal operating pressure? Part 1, #366 – Arena Fire Protection & Life Safety Evaluation Guide, #223 – Fire Sprinkler System Pipe Material: NFPA Requirements and the Pros and Cons of Steel, #121 – What Facility Managers Need to Inspect on a Fire Sprinkler System, Part 5, #153 – How to Remove Concrete Anchors: The Complete Guide, #100 - Residential Fire Sprinkler Systems: Guide to Installing Home Fire Sprinklers (Part 1), #204 – Fire Hose Adapters and Fittings: The Definitive Guide, Guides for Fire Protection Equipment and Fire Safety Systems, Standpipe Systems and Fire Department Connections. analysis to The flow reading on the pitot gauge is 62 psi. For the best experience on our site, be sure to turn on Javascript in your browser. website. The material presented on Thoughts on Fire and QRFS.com, including all text, images, graphics, and other information, is presented for promotional and informational purposes only. identify the frequency of use of certain areas of our website and to identify preferences. you visit or link to our social media pages, data is processed both by us and the applicable social effectiveness (such as which web pages are visited, which messages are responded to, or what If you are author or own the copyright of this book, please report to us by using this DMCA popularity Now that you’ve got a grasp on how PSI, discharge coefficients, and diameter impact a hydrant’s flow rates, try our handy GPM calculator for fire hydrants: Watch this video for another step-by-step example of how to use the pitot gauge’s PSI reading to calculate the rate of water flowing from the hydrant in GPM: Theoretical discharge tables, like the one we provide with our selection of pitot gauges, make the conversion even simpler. how to use a pitot gauge for hydrant flow testing, City of South Salt Lake Fire Marshal Regulations, #370 – NFPA Guidance on Fire Hydrant Testing, #369 – Replacement Fire Sprinkler Escutcheons: Finding the Right Model, #368 – Fire Safety in Historic Buildings: A Rehabilitation Planning Guide, #367 – Which Fire Sprinkler Flex Drop Do I Need? If this article helped you understand fire hydrant testing calculations, check us out at Facebook.com/QuickResponseFireSupply or on Twitter @QuickResponseFS. truncated Google will use Step 4: Find the square root of 62 psi, which is 7.8740. Questions about QRFS products or need a brand or item that's not in our online inventory? Put simply, that means if the orifice is 2.5 inches, the blade should be about 1.25 inches out. this information to analyze your use of the website, compile reports on activity for us, and perform But it’s important to keep in mind that the table is based on using a coefficient discharge of 1 in the formula, which is the theoretical discharge from a perfect circular orifice. Just call us at +1 (888) 361-6662 or email [email protected]. Computes a flow-rate in GPM given a psi and coefficient of the flow device. Google may also transmit this Fire hydrants are color-coded according to their strength of output, enabling fire departments to assess their water resource capabilities quickly when they arrive on the scene of an emergency. Simply find the pitot pressure reading on the left and slide your finger over to the matching orifice size to reveal the GPM. pages or opened an email and for other related website statistics (for example, recording the jump straight to the formula, followed by a step-by-step process and a calculator.

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