• Max Number of Sprinkler Heads In R-2 Dwelling Unit

    Good morning any help would be much appreciated. I have an R-2 complex being built with 25 units within it. They are installing a 13R system throughout the dwelling units. NFPA-13R section states listed resid...
    last modified by cfdeng1@verizon.net
  • What is the nfpa rules control using electrical tunnels to pass my water firefighting network throw it

    I need to know if there are any restrictions to use electric cable tunnel to extend my water firefighting throw it to pass to other locations 
    last modified by mohammedfauomey
  • Diesel vs. Electric Fire Pumps

    We are planning to use two vertical turbine fire pumps (one working, one standby spare) to provide seawater for firefighting at the new wharf at a marine oil terminal. Standard practice would be to provide one electri...
    last modified by carl_fromm
  • Extinguishers Foam or Dry Chemical

    Now with the entry of Natural Gas, which would be the most suitable Dry Chemical or Foam extinguishers?
    last modified by dario.munoz
  • How to treat Pipe Rack/ wooden prop storage?

    I'm designing the sprinkler system for a warehouse where class IV fabrics (costumes) will be stored. There will be a separate area where Class III props will be stored.   The problem I'm running into is as follo...
    last modified by michaele
  • Dry System couplings

    Is it Nfpa 13 code for dry systems that the couplings have a flush type gasket? In the 2010 edition it states the coupling and gasket shall be listed but I can not find anything stating the type of gasket to be used....
    last modified by districtfireprotection
  • Trapeze Hangers are sized using a tabulated Section Modulus. Can I size Trapeze Hangers computing a Section Modulus by me using the same values used to calculate the tabulated Section Modulus?

    From NFPA 13 -, We Know that Hangers shall de designed to support five times the weight of a water filled pipe plus 250lb (115kg) at each point of support.   But in, Trapeze Hangers are sized u...
    last modified by sti
  • Manual Dry Standpipe Supervisory Air

    NFPA 14, 2019 edition and NFPA 14, 2016 6.1.1 Location of Dry Standpipes. Requires that Dry standpipes be monitored with supervisory air in accordance with NFPA 72. In the 2013 edition supervisory air was required whe...
    last modified by nikiw
  • NFPA 13 2019: Pipe Stand Components

    A question on pipe stands-installed per NFPA 13-2019 edition. To support valve headers, components, valves, backflow preventers, I understand you need to support the load with a stand of 2" sch. 40 pipe, of a maximum...
    last modified by quickresponse@verizon.net
  • Automatic Air Vent

    Can AAV install on top of wet riser inside the room of top off the building?   Kindly refer attached NFPA code A8.16.6 about AAV
    last modified by kiyas18
  • Mounded LPG tanks Fire water requirment

    Hi,  Is there any requirement for fire water system for the LPG mounded bullet tanks as per the NFPA. As only few lines associated with tank are out to the atmosphere rest everything is under the mound so how ...
    last modified by nav822nav
  • Difference between Steel Pipes ASTM A53 Gr B Type F and Type S

    Hi All, Is there any difference between Steel Pipes A53 Gr B Type F and Type S when using for Sprinkler systems? and what is the preference of one over another?   Thanks,
    last modified by waelio
  • Stop Data Center CRAC units before initiate the NOVEC?

    Im asking the Datacenter Novec system application. What is the best scenario of the white space cooling system in case of fire? Should the CRAC (or CRAH) units be stopped before the NOVEC extinguishing system starts? ...
    last modified by senol.gurvit
  • Zone control valve

    Hi, Please refer below snap shot from NFPA 13. Question 01 We are designing for wet sprinkler system Ordinary hazard. After 275 sprinkler the below table sating 200 mm diameter pipe.Section 8.2 not mentioned about ...
    created by nirmalraj.muthu
  • does a walk in shower counts in the bathroom area calculation to determine if you need a sprinkler in a residential apartment?

    The question is in reference to: Where NFPA 13 systems are installed in residential applications, sprinklers can be omitted from bathrooms that do not exceed 55 square feet (5.1 square meters) in area as long as the ...
    last modified by cwc30col
  • Electronic damage following the discharge of a gas suppression system.

    Does anyone know if there has been studies done on damage to electronic equipment such as switches following the activation of a Pyroshield gas suppression system in a Data Center? We are aware that hard drives can be...
    last modified by securesystemsza@gmail.com
  • Standpipe requirements

    I currently have a type 5B podium building under construction in my area. It is 3 stories with retail on the 1st floor and residential on the 2nd and 3rd floors. The building will be fully sprinklered with a 13 system...
    last modified by mesposito
  • What is the equation for transport time of smoke as related to ceiling height?

    I have been looking through the appendix B of NFPA 72 and I cannot find an equation where I can get the transport time of smoke as a correlated to the ceiling height. For example, I am trying to find the time it would...
    last modified by mjkfire2000
  • How often do paint booth fire suppression and kitchen hood suppression systems need to be tested  ?

    How often do fire suppression systems in paint booths and kitchen hoods need to be tested.
    last modified by kevin.duvall
  • New piping for 4 new heads on an existing system, hydrostatic test or system pressure?

    Question on NFPA 13 25.2.1 Hydrostatic Tests section.   Section states that "Modifications to existing piping systems shall require testing at system working pressure.  Section
    last modified by mfarmer