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The Two Drivers for Minimum Sprinkler Flow

3/25/2020

 
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​

Read More

Fire Alarm Elevator Requirements (A Cheatsheet)

3/19/2020

 
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 joe@meyerfire.com, 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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If you know anyone that could benefit from this content, please consider forwarding them a link.

Hope you have a safe and healthy rest of your week! Thanks for reading.

When Are Sprinklers Required in Elevators?

3/12/2020

 
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! 

If you don't already get these free tools to your inbox, subscribe here. If you're having trouble viewing the image below, view it in your browser here.
DOWNLOAD ELEVATOR PDF CHEATSHEET
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If you've found this helpful, consider sharing it with a friend or colleague. As always you can subscribe and get more free tools like this at www.meyerfire.com/subscribe. 

Thanks & have a great rest of your week!

New Sprinkler Soffit-Obstruction Calculator

3/4/2020

 
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 8.6.5.1.2 for Standard Spray Sprinklers, 8.8.5.1.2 and 8.9.5.1.4 for Extended Coverage Sidewall and Pendent/Uprights, and Sections 8.10.6.1.2 and 8.10.7.1.4 for Residential Sidewalls and Pendent/Uprights. 

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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


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Our goal is to improve fire protection practices worldwide. We promote the industry by creating helpful tools and resources, and by bringing together industry professionals to share their expertise.

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We respect your privacy and personal data. See our Privacy Policy and Terms of Service. 
The views, opinions, and information found on this site represent solely the author and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence.

Discussions are solely for the purpose of peer review and the exchange of ideas. All comments are reviewed. Comments which do not contribute, are not relevant, are spam, or are disrespectful in nature may be removed. Information presented and opinions expressed should not be relied upon as a replacement for consulting services. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a small commission for orders placed elsewhere.

  • Blog
  • Forum
  • THE TOOLKIT
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR*
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND*
    • FIRE FLOW CALCULATOR*
    • FIRE PUMP ANALYZER*
    • FIRE PUMP DATABASE*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER*
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR*
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'22)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • QUICK RESPONSE AREA REDUCTION
    • REMOTE AREA ANALYZER*
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • SYSTEM ESTIMATOR*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
    • UNIT CONVERTER
    • VOLUME & COMPRESSOR CALCULATOR
    • WATER STORAGE*
    • WATER SUPPLY (US)
    • WATER SUPPLY (METRIC)
  • UNIVERSITY
    • ABOUT
    • CATALOG
    • CONTENT LIBRARY
  • PE Exam
    • PE Forum & Errata
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  • LOGIN
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