• driver sizing for fire pumps

    Hello, how do drivers for fire pumps in NFPA 20 sprinkler installations have to be sized correctly? Do the drivers have to be sized only up to the 150% of the rated flow or do the drivers have to be sized to the non-o...
    created by marcus.braun
  • NFPA 25 - Annual Fire water pump test- Acceptance criteria

    In NFPA 25 , regarding Fire water pump Annual Performance test, one of the acceptance criteria is specified as  pump performance shall be within 95% of the initial unadjusted field test curve. If the initial fiel...
  • Reports of Health Effects of AFFF

    The July 2020 edition of Professional Safety Journal (page 10) discusses a current study by Mauge-Lewis and researchers regarding growing concerns over possible adverse health effects of AFFF (Aqueous Film-Forming Foa...
    last modified by tvanhooser
  • Determining of Design Area in Hotel Building

    Hi,       i need expert opinion on subject mentioned, I m working in MEP contracting company as a mechanical engineer, I need to perform fire sprinkler hydraulic calculation for one of our pr...
    last modified by alisaif2012
  • Two Valve Low Point Drains on Dry Systems

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    created by sfsprink

    Hello, i have a question about dry fire extinguish system. Can i use dry chemical extinguish sprinklers on the car parking?
    last modified by matep
  • Maximum velocity of 20 ft/s in fire protection piping systems

    NFPA 13 (2020 edition) and earlier editions was silent in putting a limiting velocity in the piping along cross mains and branchlines of its sprinkler system. There are some individuals who specify that the maximum ve...
    last modified by rick.nunez.3000
  • On fitting/s directly connected to a sprinkler: When could the fitting/s be neglected in the calculation of pipe friction loss?

    Reference: NFPA 13 (2019 Edition) Friction Loss Pipe friction loss shall be calculated in accordance with the Hazen–Williams formula with C values from Table, as follows: (9) Fr...
    created by rick.nunez.3000
  • NFPA 20:2019 - Sizing Circuit Breaker from Fire Pump Panel

    I think to use a circuit breaker with only magnetic protection for a single fire pump (without a jockey pump).Should the FRAME of the circuit breaker meet the rated current OR just the current sensor of the circu...
    created by bindim
  • Comments on New Fire Extinguisher "Automatic Fireball"

    FIRE GUARD   See link on a new device by Fire Guard that claims a fire suppression agent (6-inch ball)  can extinguish a fire in an area up to 905 square feet. Any information the NFPA has on this type of e...
    last modified by tvanhooser
  • Sizing the Pressure Maintenance (Jockey) pump

    NFPA 20 (2019 edition) Section discusses on the jockey pump sizing to replenish the pressure due to the allowable leakage and normal pressure drops, with a suggestion (a guideline) to select a jockey pump tha...
    last modified by rick.nunez.3000
  • edificios de altura nfpa 14

    cuando tengo un edificio clasificado como de no gran altura puedo colocar sistema de tubería vertical clase 1 (manual húmedo), sin tanque ni equipos de bombeo, solo que dependa del departamento de bomberos.
    last modified by proyectos4dc
  • Pressure for hose streame inside and the hydrant outside

    hello fire experts what NFPA13 requires minimum and maximum pressure for hose streame inside and the hydrant outside #
    last modified by jad.kla
  • safty margin sprinkler calculation

    Hello fire protection experts: Is the safety margin that we add during hydraulic calculations of 1bar or 10% mandatory by NFPA13? if yes it is the article refrence
    last modified by jad.kla
  • Remote fire systems

    Greetings, Does anyone have some really good fire system ideas for remote generation. Imagine that you have 60 locations and getting service in these areas is expensive and sometimes not possible due to weather. ...
    last modified by dmaynor
  • Sprinkler System in Open Floors

    At a high-rise open structure used for assembly occupancy, each floor is at 8m high and is without external walls. Each is intended to install automatic sprinkler system in each open floor in accordance with NFPA 13- ...
    last modified by hamad.koroni
  • NFPA Water Based Systems Designer

    Hi all,      I am a life scientist that is looking to make a career change. I am intrigued by fire sprinkler design because I have done quite a few installation jobs with my dad as a laborer (he o...
    last modified by travis_white
  • Classification of Indoor Grow Operation

    How would you classify an indoor (cannabis) plant grow room. Drywall & concrete. Plants are well watered in pots, sitting on palates covered in congregated metal. Lights are securely mounted with wire. Plants are ...
    last modified by efordonski
  • Sprinklers in Scissor Stairs

    In a noncombustible construction stair shaft, NFPA 13, 2013, section states that "where noncombustible stair shafts are divided by walls or doors, sprinklers shall be provided on each side of the separation...
    last modified by supportit
  • underground piping

    is there a clearance code for underground pipe that go under or above other pipes in the ground?
    last modified by bnado_coronado