MeyerFire
  • 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
    • PE Store
    • PE Tools
    • PE Prep Series
    • PE 100-Day Marathon
  • LOGIN
  • PRICING
    • SOFTWARE & TRAINING
    • STORE
  • THE CAUSE
    • ABOUT US
    • BECOME AN INSTRUCTOR
    • HELP/SUPPORT
Picture

Thank You

3/30/2018

 
I just wanted to take a quick moment and thank you for the great response to this three day launch of the Sprinkler Database. 

If you haven't checked it out already - the deal for the Sprinkler Database is here.

I look forward to continuing to create helpful tools to help you do exceptional work, and the launch of the database is one way that helps me keep those efforts going. 

Have a great weekend and a Happy Easter, thank you!

New Compressor Sizer

3/28/2018

 
If you coordinate upfront bid documents and are planning to have a dry sprinkler system on your project, you probably get the same question from electrical engineers as I do - how large will your compressor be?

It can be a difficult question to answer, considering there's multiple manufacturers and a handful of different options in choosing the right compressor for your project.

NFPA 13 requires that a dry system have an air supply capable of restoring normal air pressure for the system within 30 minutes (NFPA 13 2002-2010 Section 7.2.6.2.2, 2013-2016 7.2.6.3.2).

Fortunately, I've made a small update to the Sprinkler System Volume Calculator that indicates compressor sizes associated with your system volume. See the full tool here.

​
Do you get these weekly tools and articles via email? If not, subscribe here and get a free PDF guide for canopy and overhang requirements. 

The All-New Sprinkler Database

3/27/2018

 
It's almost here! The MeyerFire Sprinkler Database goes live tomorrow at 9am Central. Check out more detail about our long-awaited project with our video:

Can't see the video? View it here.

See all the details at www.meyerfire.com/sprinkler.
​

Fire Sprinkler Friction Loss: A Quick Calculator

3/20/2018

 
Estimating Pipe Sizes for Sprinkler Systems

Occasionally when designing fire sprinkler systems I'm interested in approximately sizing a specific run of pipe early in a project.

That point of interest is often an underground service entry, a main for coordination, or even standpipes. Prior to doing a complete set of hydraulic calculations, running a quick calc using the Hazen-Williams formula can help give an order of magnitude pressure loss that is helpful with initial sizing.

Here's the calculator I use for these estimates. Don't see the tool below? See it here.


​Example: Underground Service Main Sizing

Consider a new project with an Ordinary Hazard Group II fire sprinkler system.

What should the underground service size be? 

A 4-inch fire main can be permitted under special circumstances (see NFPA 13 2002 Section 15.1.3, 2007-2010 23.1.3, 2013-2016 24.1.3). A 6-inch fire main is common. Is an 8-inch necessary? If the length of the service main is 10 feet, my answer can often be quite different than if the service main is 1,000 feet.

For this exercise I often run a quick calculation to judge the pressure loss in this single pipe as opposed to running calculations for a full system, to get order of magnitude pressure loss. Let's assume a long service main length of 750 feet.

Hazen-Williams Formula

NFPA 13 stipulates the Hazen-WIlliams formula be used for pipe friction loss calculations for systems other than antifreeze (NFPA 13 2002 Section 14.4.2.1, 2007-2010 22.4.2.1, 2013-2016 23.4.2.1).

The Hazen-WIlliams formula, while generally considered conservative, only requires the flow, friction loss coefficient (or C-Factor), and the actual internal diameter of the pipe.

Estimating Flow for a Sprinkler System

For an Ordinary Hazard Group II example, I can roughly estimate the flow for the system simply based on density and area (assuming the density/area calculation approach). A density of 0.20 gpm/sqft over the most remote 1,500 sqft begins to look like:

Download this Tool
​Approximate Flow = Density x Area x Overflow Rate + Hose Allowance
Approximate Flow = (0.20 gpm/sqft) x (1,500 sqft) x (1.3) + (250 gpm)
Approximate Flow ​= 640 gpm
​
Why include the Overflow Rate? Naturally a fire sprinkler system is not going to be perfectly balanced.

While my most remote sprinkler can be calculated at exactly 7 psi and it's k-factor that throws exactly 0.20 gpm/sqft, the feed to that sprinkler will have friction loss. Due to that loss, the adjacent sprinkler will experience a slightly higher pressure than 7 psi and thus will throw slightly more water. This process repeats where sprinklers closer to the riser will provide more than the stipulated density.

For order-of-magnitude estimates, I've found that a 30% overflow will be generally close to the final flow result.

Pipe Schedule

The pipe thickness affects the actual internal diameter of the pipe, so I've included it here. I typically will use Schedule 40 pipe for sizes 2-inch and smaller (so that they may have threaded ends), but I've left the schedule type open to users as I know these preferences can vary.

C-Factors

The C-Factor relates to the friction-loss due to the surface of the interior of the pipe. NFPA 13 stipulates C-Factors for fire sprinkler systems depending upon the type of system and pipe material. These can be found in NFPA 13 2002 Table 14.4.4.5, 2007-2010 Table 22.4.4.7, 2013 Table 23.4.4.7.1, 2016 Table 23.4.4.8.1.

Note that important and impactful changes to the c-factors occurred in the 2013 edition for use of galvanized steel, which has been found to accelerate corrosion by focusing the corrosive action at specific weak points in pipe.

Fire Sprinkler Pipe

Friction Losses

With only a few inputs (Flow, Pipe Thickness, C-Factor, and Length of Pipe) you'll now have a comparison of pressure loss across a handful of pipe sizes. Punch in 640 gpm, a Global C-factor of 140 for underground pipe, and a 750 foot pipe length to test this example.

If there is plenty of water at high pressure available to the site, perhaps a 48 psi drop on the service entry could be tolerable and a 4-inch main could be used where it meets other NFPA 13 requirements.

For the vast majority of projects I cover this loss (48 psi) would not be acceptable. The 6-inch service main shows a pressure loss of under 7 psi, and an 8-inch shows under 2 psi loss. Depending on the water to the site, either of these begin to look much more reasonable.

The Friction Loss Calculator

This tool is designed to give quick-comparisons of pressure loss for a run of pipe and compare it against other pipe sizes.

Do you get these free weekly articles? If not, subscribe here.

When Are Sprinklers Required in Bathrooms?

3/13/2018

 
Updated November 2020

I get this question all the time from architects - especially when working around apartment, hotel, senior and assisted living facilities. 

"Are sprinklers required in the bathrooms?"

I don't mind the question at all, because it has a relatively straightforward answer - they're either allowed to be omitted or not. The path to determine whether an exemption applies is actually fairly complex which I'll explore today. 

Note that this article covers requirements but also some helpful explanatory material pulled in from non-enforceable parts of codes and standards (such as the annex material). 

Side Note: Big Launch Coming

This is week 2 of my 3 part series in creating resources for sprinkler designers, engineers, inspector's, and contractors. Stay tuned for the big product launch coming in the next few weeks. Now back to the article -

Why Allow the Omission of Sprinklers in Small Bathrooms?

Typically, since bathrooms require regular cleaning and are subject to variable humidity, surfaces can often be ceramic or non-porous. These easily washable surfaces tend to also be less combustible than other building materials.

In studies of apartment fires where sprinklers were present, for instance, bathrooms were the area of fire origin in only 1% of total fires and resulted in no civilian deaths, civilian injuries or property loss (NFPA 101 Annex Material in A.30.3.5.4 & A.31.3.5.4).

From a risk perspective, small bathrooms present a relatively low risk for fire origin and growth as compared to other areas of a building.

Also, bathrooms in buildings with dwelling units also can comprise a major potential additional cost when they are repeated within each unit. Omitting sprinklers can offer a huge cost savings to these type projects.
Fire Sprinkler Bathroom
For some residential occupancies, there can be significant cost savings to omitting sprinklers in small bathrooms throughout a building. Due to relatively lower risk of ignition, building codes and standards permit omissions for specific applications.
​

Building Codes Overrule NFPA 13

Starting with the 1997 edition of NFPA 101, language was introduced into the code to override the requirements in NFPA 13 and NFPA 13R. NFPA 101 only overrides NFPA 13 for specific occupancies, which are outlined below.

The International Building Code also introduced provisions for omitting sprinklers in restrooms, beginning with the 2015 International Building Code. These sections are also reflected in the companion International Fire Codes.

If Small Bathrooms Omit Sprinklers, Is the Building Still Fully Sprinklered?

Yes; where NFPA 13 omits sprinklers the building is still sprinklered in accordance with NFPA 13 and is typically considered fully sprinklered.

Where omissions are allowed by NFPA 101, the building is also still typically considered to be protected throughout (reference NFPA 101-2015 A.11.8.2.1 or NFPA 101-2018 A.11.8.3.1, for instance).

Are Bathtub or Shower Enclosures included in the 55 sqft limitation?

Yes; they are typically considered part of the room as NFPA 13R-2002 introductory material clarifies.

If There’s Just a Toilet, is it Still a Bathroom?

Yes; annex material of NFPA 13 (2002 A.3.3.3, 2007-2018 A.3.3.2) clarifies that a toilet rooms is still considered a bathroom.

Also, two adjacent bathrooms are still considered separate rooms provided that they’re enclosed with the required level of construction.

If There’s No Door, is it a Bathroom?

Weird. This must be some kind of a HGTV renovation for hippy-people if you don’t have a door for some bathroom privacy. Oh and yes, a door is not required in order to omit sprinklers as long as the bathroom complies with the definition of a compartment (NFPA 13 2010-2016 A.8.15.8.1.1).

The Quick-Guide to Determine Permitted Bathroom Sprinkler Omissions:

Fire Sprinklers in Bathrooms
DOWNLOAD UPDATED PDF CHEATSHEET
Get Access

MeyerFire.com is all about creating helpful articles, tools, and calculators for fire protection designers, engineers, review authorities, inspectors, and contractors. Don't receive these weekly resources already? Get them free here.

A New Calculator for Cloud Ceiling Sprinklers

3/7/2018

 
Last Week's Survey Results

Last week I sent a survey asking for "challenges associated with sprinkler identification and design selection."

I really appreciate the input provided, there was really helpful and great feedback: common challenges people noted in the survey included sprinkler market availability, listing and approvals, field identification, adherence with product data, price, storage limitations, pressure requirements, and spacing requirements.

Anticipation for the Big Launch

I am very excited to say that I've been developing a live resource over the past couple years to address almost exactly those challenges. Stay tuned, as more details will be available about the launch in a few weeks. 

In the meantime, I'm also excited that the blog posts over next three weeks (starting with today) will feature tools designed to help streamline and speed workflow for inspectors, designers and engineers. 

Part I of III: The Cloud Ceiling Calculator

This first week covers the relatively new allowances for cloud ceilings.
Fire Sprinkler Cloud Ceiling
"Cloud" Ceilings where directly addressed in NFPA 13 beginning with the 2016 Edition

Cloud Ceilings include any ceiling installed in the same plane with horizontal openings to the structure above on all sides (NFPA 13-2016 3.3.5.1). The "cloud" is simply in reference to the appearance that the ceiling "floats". 

The new provisions in NFPA 13-2016 allows sprinklers to be omitted above cloud ceilings where the gap between clouds (or clouds and walls) meets a maximum allowable dimension based on the floor-to-cloud ceiling height.

Backed by Research

What I love about this new verbiage is not just that the NFPA 13 committee addressed a specific topic that many had asked about for some time, but that the development of the rules for this section are based on a commissioned project by the Fire Protection Research Foundation.

So what is the guidance based on the research findings? Spaces above cloud ceilings do not require sprinklers where the openings have a combined total area of not more than 20 percent of the ceiling, construction feature, or plane used to determine the boundaries of the concealed space and the cloud ceiling arrangement meets Section 8.15.24.1 (NFPA 13-2016 8.15.1.2.1.3).

Limitations

I've already mentioned that the opening between all cloud ceilings can't be more than 20% of the total room area, but there's a few others that also apply:
  • Sprinklers must be quick response, standard or extended coverage, and pendent or uprights (NFPA 13-2016 8.15.24.2.1)
  • Extended coverage sprinklers cannot be more than 16 ft x 16 ft spacing (NFPA 13-2016 8.15.24.2.1.1)
  • Maximum ceiling height cannot exceed 20 feet (NFPA 13-2016 8.15.24.2.2)
  • Normal sprinkler spacing tables of 8.6.2.2.1(a) for light hazard and 8.6.2.2.1(b) for ordinary hazard can't be exceeded (NFPA 13-2016 8.15.24.2.3)
  • Ceilings must be of smooth construction (NFPA 13-2016 8.15.24.2.4)
  • For irregular shaped (non-rectangular) ceilings, the minimum ceiling width dimension is the smallest dimension of the cloud and the gap width dimension must be the greatest between clouds or  walls (NFPA 13-2016 8.15.24.2.5)

Ceiling Spacing Calculator

If these limitations can be met, sprinklers may be omitted above where the spacing below the ceiling complies with Table 8.15.24.1. The table addresses the maximum protection area based upon the research, and is a little less than intuitive.

​Here's a quick calculator that takes your parameters and gathers the appropriate maximum sprinkler protection area (click the link to see the full tool, with a schematic section of the ceiling arrangement):
​

Enter your project parameters in the red highlighted cells to test your situation. Give it tool a try and let us know what you think in the comments section below. 

If you've found this interesting or helpful, consider getting more of these tools by joining our email group.

​Already subscribed? Share this on LinkedIn for others who might find it interesting.
​
Get More Like This
    Picture
    Why Sponsor?

    ALL-ACCESS

    Picture
    GET THE TOOLKIT

    SUBSCRIBE

    Get Free Articles via Email:
    + Get calculators, tools, resources and articles
    + Get our PDF Flowchart for Canopy & Overhang Requirements instantly
    Picture
    + No spam
    ​+ Unsubscribe anytime
    I'm Interested In:

    AUTHOR

    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


    FILTERS

    All
    Announcements
    Book Review
    Calculators
    Career
    Course
    Design Challenge
    Fire Alarm
    Fire Events
    Fire Suppression
    Flammable & Combustible Liquids
    Flexible Drops
    Floor Control Valve
    Life Safety
    News
    NICET
    Passive Fire Protection
    PE Exam
    Products
    Site Updates
    Special Hazards
    Sprinkler Systems
    Standpipes
    Tools
    Videos


    ARCHIVES

    January 2023
    December 2022
    November 2022
    October 2022
    September 2022
    August 2022
    May 2022
    April 2022
    March 2022
    February 2022
    January 2022
    November 2021
    October 2021
    September 2021
    August 2021
    July 2021
    June 2021
    May 2021
    April 2021
    March 2021
    February 2021
    December 2020
    November 2020
    October 2020
    August 2020
    July 2020
    June 2020
    May 2020
    April 2020
    March 2020
    February 2020
    January 2020
    December 2019
    November 2019
    October 2019
    September 2019
    August 2019
    July 2019
    June 2019
    May 2019
    April 2019
    March 2019
    February 2019
    January 2019
    December 2018
    November 2018
    October 2018
    September 2018
    August 2018
    July 2018
    June 2018
    May 2018
    April 2018
    March 2018
    February 2018
    January 2018
    December 2017
    November 2017
    October 2017
    September 2017
    August 2017
    July 2017
    May 2017
    April 2017
    September 2016
    August 2016
    July 2016
    June 2016
    July 2015
    June 2015
    May 2015

    RSS Feed

Picture
​Home
Our Cause
The Blog
The Forum
PE Exam Prep
The Toolkit

MeyerFire University
​Pricing
Login
​Support
Contact Us
Picture

MeyerFire.com is a startup community built to help fire protection professionals shine.
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.

​MeyerFire, LLC is an International Code Council Preferred Education Provider.

All text, images, and media ​Copyright © 2023 MeyerFire, LLC

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
    • PE Store
    • PE Tools
    • PE Prep Series
    • PE 100-Day Marathon
  • LOGIN
  • PRICING
    • SOFTWARE & TRAINING
    • STORE
  • THE CAUSE
    • ABOUT US
    • BECOME AN INSTRUCTOR
    • HELP/SUPPORT