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One of my wanted items on my personal to-do list was a full lineup of flow charts that incorporate discharge coefficients coming off a fire hydrant. These (in my line of work) are most commonly used in fire hydrant flow tests, where flow comes out of the side (commonly 2-1/2") outlets or the main pumper outlet (single 4" or larger).  So what is a discharge coefficient? When we flow out of an orifice, water is restricted and forced into a smaller cylindrical shape. The discharge coefficient is what helps us adjust the measured pitot pressure, which is taken along the centerline of the stream, and adjust for about how much flow is coming through the opening. It's simply comparing the size of the actual stream against the size of the opening. When a long straight stream-straightener is used, this coefficient is high. The stream is less tightly condensed as compared to the opening dimension. When water takes a more difficult approach and is restricted in its flow, this coefficient is lower.
Discharge Coefficients as Identified in NFPA 291 We'll discuss this in more detail later. For today, we've created flow charts for these three different discharge coefficients. See the PDF link below to get access to all three flow charts, broken out across a number of different orifice sizes.  Thanks for being a subscriber and being part of our story. We're all about sharing helpful content and finding ways to support the industry by making you, the fire protection pro, shine. We hope information like this is helpful.
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The database is a collection of over 1,500 fire sprinkler models on the market today. Even with a select number of manufacturers, finding just the right type of sprinkler with correct spacing and minimal pressure demands can be tough. The database was built to get answers in seconds - with links directly to manufacturer websites & data sheets. See a quick update video here: The database is part of our Toolkit package. More information about that here. Have a great rest of your week! |
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+ Unsubscribe anytime AUTHORJoe Meyer, PE, is a Fire Protection Engineer out of St. Louis, Missouri who writes & develops resources for Fire Protection Professionals. See bio here: About FILTERS
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September 2024
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