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Benefits/Reasons for Flow Tests vs. Modeling?

9/14/2022

16 Comments

 
Most cities require fire flow tests before design and calculation of a sprinkler system, but I have dealt with a few cities that instead use a water modeling system to calculate the pressure and flow at certain locations.

What is the reason for this?

Are there benefits or downsides to one or the other?

Is one more accurate?

Thanks in advance - appreciate the input.

​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
16 Comments

Second 2.5" Outlet on Same or Different Hydrant?

9/13/2022

11 Comments

 
When conducting flow tests and the desired flow (gpm) for the test is not obtained via a single 2-1/2" fire hydrant outlet, should additional flow be achieved by opening an additional 2-1/2" outlet on that SAME fire hydrant, or should a single 2-1/2" outlet be opened on an ADDITIONAL fire hydrant?

So for multiple 2-1/2" outlets opening and flowing, should this be done:
  • (A) using one fire hydrant with two 2-1/2" outlets flowing, or
  • (B) with two fire hydrants with one 2-1/2" outlet flowing each?

I have heard people say that (A) is correct and (B) is incorrect, and vise versa. Thank you.

​​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
11 Comments

Which Hydrant to Flow for Well-Gridded Supply?

3/24/2022

10 Comments

 
I'm quite familiar with conducting hydrant flow tests, NFPA 291, and have read articles such at the Sprinkler Age article from Feb. 2018. And I know the residual hydrant should be between the hydrant(s) to be flowed and the large source mains for the area.

But in terms of a specific project site (especially if the underground is well-gridded), would you chose the hydrant closest to your project to be the static/residual hydrant, or would you select the flowing hydrant to be closest to your project (and adjusting the static/residual for any elevation difference)?

​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
10 Comments

Discharge Coefficient for Hydrant With 45-Elbow?

6/22/2021

4 Comments

 
When we run hydrant flow tests, we usually use both 2-1/2" side-outlets of a typical dry fire hydrant. We hook up one, threaded, swivel 45-elbow on each side to divert water in a direction that won't destroy anything.

What is the appropriate Coefficient of Discharge when measuring the pitot on the centerline of the elbow?

Traditionally flowing straight out of the side outlet of a hydrant, NFPA 291 gives three Coefficients (0.90, 0.80, and 0.70) based on how the outlet projects into the barrel. NFPA 291 also states that a coefficient of 0.85 is suggested for stream straighteners, unless the coefficient of the tube is known.

Is there a known Coefficient for a single 45-degree elbow?

Any help is greatly appreciated.

​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
4 Comments

Is Pitot the Same As Residual on Flow Test?

12/27/2019

6 Comments

 
Fire hydrant flow test question - is the pitot the same as the residual pressure on a water flow test from a fire hydrant?

Is it possible to know the residual pressure and 'chart out' the flow of the fire hydrant, or is there a way to determine the flow with only the static and residual pressures?

​​​Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
6 Comments
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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.

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  • 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
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