First - last week I put together a draft PDF cheatsheet for fire alarm design in elevators. Lots of great response to that tool. One major flub on my part - I didn't actually link to it. Here's an actual working hyperlink (fingers crossed).
K-Factor & Pressure Versus Area & Density
One of the hand calculations I do frequently when laying out sprinkler systems is comparing the k-factor, minimum pressures, and resulting flow for the sprinkler. It comes up all the time with residential-style, extended coverage, special application, and storage sprinklers.
Many hydraulic calculation programs do this comparison automatically. That being said, it is important to understand and compare the minimum flow from sprinklers for a hydraulic calculation.
Reducing unnecessary flow from a sprinkler reduces the total calculated flow from a system, which has major impacts on pipe sizing for some branch lines, cross mains, feed mains, and even the underground service size.
Driver #1: K-Factor and Minimum Pressure
There are two drivers for the actual minimum flow that must come from a fire sprinkler.
The first driver is the K-Factor and Minimum Pressure. This equation is
Q = k√P
Wow a lot has changed in a week. We're holding on fine here, but I hope you and your family are safe and healthy wherever you are.
Now back to more fun things like fire protection -
After last week's debut of fire sprinkler requirements for elevators, I had a couple emailed requests for a fire alarm version. I love the idea and put some time into reviewing and organizing the requirements on the fire alarm side.
This first iteration is a draft, and if you're well versed in this arena I'd love for you to take a look and let me know what you think. Feel free to email me directly at firstname.lastname@example.org, or comment on it here.
In the upcoming week I plan to incorporate ASME A17.1 and it's impact on the fire alarm side of accounting for elevators, hence the big [DRAFT] watermark on this PDF.
Click on the image below to get a PDF copy of the Fire Alarm Elevator Cheatsheet:
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Hope you have a safe and healthy rest of your week! Thanks for reading.
While it is a basic question, the code path is somewhat complex. When does an elevator require fire sprinkler protection?
Today I'm exploring the code requirements for elevator sprinkler protection under the International Building Code (IBC) and NFPA 13. Here's a free PDF cheatsheet for navigating these requirements. To download, just hover over the image and click print or export.
A special thanks to Philip Valdez who sent over the suggestion to put this one together. I hope you find it helpful!
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Thanks & have a great rest of your week!
Last spring I created a beta test tool for soffit obstructions to sprinklers. It was fairly basic using the dimensional rules for a soffit against a wall for a standard-spray pendent or upright sprinkler.
Thanks to some feedback and more input on this tool, I'm happy to debut it with new features. I've added code references from the 2007 to 2019 editions of NFPA 13, the different style sprinklers, and an updated visual diagram.
This tool is useful when there's a dropped soffit against a wall to determine whether the sprinkler will throw sufficiently underneath the soffit.
In the coming weeks I'll break out a code path for determining when each of these tools are used. For now, if you're familiar with the NFPA 13 Sections for Obstructions Against Walls then you'll recognize this tool's quick usefulness.
This tool stems from the Figures (b) and (c) for Obstructions Against Walls found in NFPA 13 Section 18.104.22.168.2 for Standard Spray Sprinklers, 22.214.171.124.2 and 126.96.36.199.4 for Extended Coverage Sidewall and Pendent/Uprights, and Sections 188.8.131.52.2 and 184.108.40.206.4 for Residential Sidewalls and Pendent/Uprights.
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Have a great week!
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Joe Meyer, PE, is a Fire Protection Engineer out of St. Louis, Missouri who writes & develops resources for Fire Protection Professionals. See bio here: About