MeyerFire
  • Blog
  • Forum
  • PE Exam
    • PE Forum & Errata
    • PE Problems
    • PE Store
    • PE Tools
    • PE Prep Series
  • TOOLS
    • TOOLKIT (FREE TRIAL)
    • *TOOLKIT (PURCHASE)
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
    • FIRE FLOW CALCULATOR*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'19)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • REMOTE AREA ANALYZER
    • QUICK RESPONSE AREA REDUCTION
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
    • UNIT CONVERTER
    • VOLUME & COMPRESSOR CALCULATOR
    • WATER SUPPLY (US)
    • WATER SUPPLY (METRIC)
  • TOOLKIT
  • LOGIN
  • STORE
  • About
Picture
ALL THINGS FIRE PROTECTION | SUBSCRIBE NOW

What is Req'd Pressure and Flow for Hydrants?

8/28/2020

7 Comments

 
What is the residual pressure and flow require for both public and private fire hydrants?

​​​​​​​​​​​​​​Submitted anonymously and posted for discussion. Discuss This | Submit Your Question | Subscribe
7 Comments
franck
8/28/2020 10:38:35 am

For public, I don’t know minimum requirements in the US.
In Europe, it depends on occupancy to protect and is normally 250 gpm per hydrant @ 15 psi, with a minimum number of operating hydrants (from 1 to 6)

For private, based on occupancy.
You will find guidance in NFPA and is usually 250 gpm for low hazards and 500 gpm for high hazards and storage. But may also vary, such as with the use of ESFR.
Note that some occupancies may require up to 750 gpm.
And some insurance companies / AHJ may have larger requirements

Reply
Naseer Pasha link
8/28/2020 10:50:46 am

Required Private Fire Hydrants shall be capable of discharging 1000gpm @ 20psi minimum as per IBC & NFPA 1 & 101.

Reply
Sheikh
8/28/2020 11:50:39 am

Can you please prove the reference of IBC, NFPA 1 and 101?

Although NFPA 24 provides some information of placing.

Reply
sean
8/28/2020 02:15:34 pm

I do not use NFPA 1 or 101 as often I will concentrate on the ICC model codes.

It actually comes from the IFC and it does not state those amount unless you use the appendix.

The code section is 507.3 (IFC 2018) which calls for fire flow to be per an approved method. It does not specify which method to use

SK
8/28/2020 12:26:17 pm

Residual pressure and flow requirement are dependent for which client, Country, AHJ or occupancy working for?

As inference from NFPA 13, Hydrant flow/Hose stream flow varies from 250 gpm to 750 gpm but there is no there is no single criteria.

Similarly for residual pressure, it's depend and also varies from 20 psi (1.4 bar) to 100 psi being the max. More than 100 psi hose can not be handled by safety by personnel as per OSHA guidelines...Where i am working, here is 00 psi (7 bar) is minimum requirement and I've also seen some other country it's 65 psi as well. May refer NFPA 24 C.4.1, NFPA 14 7.2.3.1 & 7.8, NFPA 13. One of the argument is for not maintaining high residual pressure is unnecessary keeping the system pressurized/stress all the time when no fire/emergency and wastage of powers, in any case, whenever it's required, pumps kicks on to meet the pressure needed. So maintaining is lower pressure is also acceptable.

Reply
sean
8/28/2020 02:16:52 pm

NFPA 13 does not influence hydrant design the fire code (IFC, NFPA 1) and NFPA 24 do.

Reply
Franck
8/31/2020 03:51:14 am

My understanding is that NFPA 13 requirements are for minimum flow demand (manual firefighting) considering that the entire facility is adequately protected by sprinklers.
NFPA 1 requirements are for minimum waterflow to be available for buildings. This may not take into consideration if the building is adequately protected or not, and this flow is to feed the hydrants + hoses + possible sprinkler systems.
Which means that if you have sprinkler systems inside your building (with a corresponding flow and pressure) fed by the same water supply, you would have less water for hydrants + hoses.

But maybe it is a misunderstanding from my side.

If somebody could clarify this for me that would be great.

Reply



Leave a Reply.

    Jump to: Daily Posts
    Jump to: PE Problems
    Picture
    Why Sponsor?

    Free Signup

    Subscribe and learn something new each day:
    I'm Interested In:

    Community

    Thank You to Our Top
    ​February '21 Contributors!
    1. Dan W.
    2. Franck
    3. Jesse
    4. CJ B.
    ​5. Brian G.
    6. Mike
    7. Matt
    8. Casey M.
    9. Jay R.
    10. Glenn B.

    Your Post

    SUBMIT A QUESTION

    The Toolkit

    Sprinkler Designer or Engineer?
    ​
    ​Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more:
    Picture
    FREE 30-DAY TRIAL
    GET THE TOOLKIT

    Filters

    All
    ABA
    ADA
    ASCE 7
    ASME A17.1
    Daily Discussion
    Design Documents
    Explosion Protection & Prevention
    Fire Detection And Alarm Systems
    Fire Dynamics
    Flammable & Combustible LIquids
    FM Global
    Human Behavior
    IBC
    IFC
    Information Sources For Analysis
    IRC
    Means Of Egress
    NFPA 1
    NFPA 10
    NFPA 101
    NFPA 11
    NFPA 110
    NFPA 12
    NFPA 13
    NFPA 13D
    NFPA 13R
    NFPA 14
    NFPA 15
    NFPA 17A
    NFPA 20
    NFPA 2001
    NFPA 214
    NFPA 22
    NFPA 24
    NFPA 25
    NFPA 291
    NFPA 30
    NFPA 33
    NFPA 400
    NFPA 415
    NFPA 497
    NFPA 5000
    NFPA 502
    NFPA 54
    NFPA 55
    NFPA 654
    NFPA 68
    NFPA 70
    NFPA 72
    NFPA 92
    NICET
    Passive Building Systems
    PE Prep Guide
    PE Prep Series
    PE Sample Problems
    Poll
    Smoke Management Systems
    Special Hazard Systems
    Types Of Analysis
    UFC 3 600 01
    UFC 3-600-01
    Updates
    Water Based Fire Suppression
    Weekly Exams


    Archives

    March 2021
    February 2021
    January 2021
    December 2020
    November 2020
    October 2020
    September 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
    November 2017
    October 2017
    September 2017
    August 2017
    July 2017
    June 2017
    November 2016
    October 2016
    July 2016
    June 2016


    Daily
    Daily discussions are open-ended fire protection, fire alarm, and life safety questions submitted anonymously for the benefit of sharing expertise and learning from other perspectives. Anyone can submit a question here:
    SUBMIT A QUESTION

    Exam Prep

    Picture
    2020 PE Prep Guide​
    ​(Available Now!)
    Picture
    PE Prep Series
    ​(Available Now!)
    2020 PE Prep Series
    Current Leaderboard
    ​(Click to enlarge)
    Fire Protection PE Exam Prep

    PE Problems
    ​Visit July-October for daily Fire Protection PE Exam sample questions.

    Solutions are posted the day after posting.

    Comment with your solutions, questions or clarifications.

    Please note that questions posted are unofficial and in accordance with NCEES rules are intended to be similar to actual exam questions, not actual exam questions themselves.

    RSS Feed

Picture
Home - About - Blog - Contact - Exam Prep - Store

​Copyright © 2021 MeyerFire, LLC

The views, opinions, and information found on this site represent solely the author shown 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. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a commission for orders placed elsewhere.
  • Blog
  • Forum
  • PE Exam
    • PE Forum & Errata
    • PE Problems
    • PE Store
    • PE Tools
    • PE Prep Series
  • TOOLS
    • TOOLKIT (FREE TRIAL)
    • *TOOLKIT (PURCHASE)
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
    • FIRE FLOW CALCULATOR*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'19)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • REMOTE AREA ANALYZER
    • QUICK RESPONSE AREA REDUCTION
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
    • UNIT CONVERTER
    • VOLUME & COMPRESSOR CALCULATOR
    • WATER SUPPLY (US)
    • WATER SUPPLY (METRIC)
  • TOOLKIT
  • LOGIN
  • STORE
  • About