• According to NFPA 2001 , when using Halocarbon systems, how to take the specific measures to limit the exposion time within 5minutes if the select the design concentration above NOAEL ?

    In the provison clause1.5.1.2 of the NFPA2001, regarding to Halocarbon systems, "Halocarbon systemsforspaces that arenormally occupied and designed to concentrations above the NOAEL[seeTable1.5.1.2.1(a)] shall b...
    zhangya
    created by zhangya
  • NFPA 12 - Setpoint of PRV for CO2 Flooding System

    Clause 4.7.2.2.1 of NFPA 12 has the following requirement: For high-pressure systems, the pressure relief devices shall operate at a pressure no less than 2400 psi (16,547 kPa) and no more than 3000 psi (20,864 ...
    saintvida
    created by saintvida
  • Double interlock preaction system - full building coverage

    Are there any occupancy restrictions where a double interlock preaction system may be used?  For example, could an entire hospital (Institutional) provide sprinkler coverage with a preaction system?  It appe...
    rerickson
    last modified by rerickson
  • How to determine the types of the hydrant for different protected rooms as per NFPA 14, Class I, Class II or Class III? 

    Within the NFPA 14, there are three types of hydrant are available to be selected, namely, ClassI, ClassII and Class III, also, the different configuration and different calculation method also illustrated in the stan...
    zhangya
    last modified by zhangya
  • Negative suction fire pumps for existing water tank

    Hi, We are designing fire protection system for an existing plant. Plant has sufficient under ground tank and pumping capacity with negative suction. Due to addition of new building height, project need to chan...
    vasu.chittem
    last modified by vasu.chittem
  • How to handle hanger and the support for  clean gas system according to NFPA 2001

    When i design the IG541 gas extinguishing system, there is no specific requirements about how to design the hanger and support? Now, for me there are two choice below, i don't konw how to deal with this issue: 1. Usi...
    zhangya
    last modified by zhangya
  • Is anyone doing the 5 year hydro-static testing for FDC's according to NFPA 25?

    I'm with an AHJ and we were thinking of enforcing all of the NFPA 5 year inspections. Just looking for thoughts and advice on who out there is testing the FDC's according to 25. Thanks. 
    sgrube
    last modified by sgrube
  • How to prevent a standpipe hose connection from malicious opening?

    I have a NFPA 14 standpipe that I want to prevent from inadvertent/malicious opening of the hose connections. What suggestions do you have?  This is what I have been able to come up with: Put caps on with a spa...
    jzour
    last modified by jzour
  • Spacing above an open grid ceiling

    NFPA 13 2013 Ed. Section 8.15.14 (1) (a) "In light hazard occupancies where sprinkler spacing (either spray or old-style sprinklers) is less than 10 ft x 10 ft, a minimum clearance of at least 18 in. shall be provided...
    hshengst
    created by hshengst
  • The storage period of the mixture of water and 3%AFFF?

    There is no fire water pump to supply water in an unmanned platform, so the platform used the foam fire-fighting system which the water and 3%AFFF is premixed. In the NFPA11, NFPA16 or other specifications, Whet...
    xujy27
    last modified by xujy27
  • Fire Detection System

    We want to install fire detection system in the area where HVAC system is already installed. In case, if we install the fire detection system on roof which is above 1.9 m from cool air supply duct the possibility of a...
    syed.bilal
    created by syed.bilal
  • Smoke Detectors above suspended ceiling - Beam Pockets

    Working in Nassau County, NY where we are designing for Above Ceiling spoke detectors where the ceiling above has beam pockets.   My question is when the NFPA references ceiling height, is it the height above th...
    mlworthleyjr
    last modified by mlworthleyjr
  • What NFPA Code Number details fire suppression wet pipe flow direction and function labeling requirements?

    I am currently trying to repaint scaling and corroded pipe a large scale facility fire pump room with multiple pumps for redundancy purposes.  What code will I need to look at in order to find the system flow dir...
    bill.kapella@lmco.com
    last modified by bill.kapella@lmco.com
  • Floor control valve above false ceiling in accesible toilet?

    Hi there, I´m in a Multistorey building supervision and have a question, in an automatic dry sprinkler system can I locate a floor control valve above the false ceiling?, the floor control valve is inside the ac...
    wilmarhernan
    last modified by wilmarhernan
  • Fire extinguisher

    What is the distance between ABC fire extingguisher
    alfred.abreu
    last modified by alfred.abreu
  • Quick Response Sprinklers In a Dry System?

    Hi there,   I would appreciate some feedback on using quick response sprinklers in a dry system. I have found no reference in NFPA 13 indicating specifically if QR Uprights can or can not be used.  Therefor...
    bikerben
    created by bikerben
  • Lintel or Soffit spec. for back-to-back sidewall spray sprinklers

    NFPA 13, Ed. 2016, clause 8.7.3.1.4 requires back-to-back sidewall spray sprinklers to be separated by a continues lintel or soffit. What should be the dimensions, and if any other requirements, of the required l...
    morteza_nemati
    last modified by morteza_nemati
  • Vortex fixed Sprinkler system Nitrogen bottle Hydro requirements

    Need some clarification on what the hydrostatic retest requirements are for 3 rows of 2500 psi Nitrogen tanks installed in bank for water mist suppression system in an underground fuel vault (not buried, in conditione...
    jyeager
    last modified by jyeager
  • How should fire hose connection and station Flow and Pressure Demand be Addressed in combined system Calculations

    Hi,   For a combined Sprinkler/Stand pipe System- Completely  Sprinklered , and fire hose connected to  wet sprinkler riserin accordance with 8.17.5.2 which am verifying the system Fire Pump Size ...
    r.hedek
    last modified by r.hedek
  • Fire Door Inspections

    What certifications are required to conduct annual Fire Door Inspections per NFPA 80?
    tmchugh
    last modified by tmchugh