• Steam Boilers running on LPG in basements

    Is there any restriction to install a steam boiler running on LPG in basements? What are the available ventilation systems to prevent the accumulation of LPG in case of leak. 
    created by eng_mikemo
  • Substation transformer Deluge system test frequency?

    What are the frequencies of testing deluge systems for transformers?   Mainly the full trip test?  If you can produce a chart just for deluge systems that would be great!   Thanks
    last modified by nathan.fraley
  • Air separation unit: fire water demand

    Hi all! Can anyone tell me how to determine the maximum fire water flow required for the protection of an air separation unit? Thank you in advance.
    last modified by imensassitra
  • NFPA 59A distance requirement clarification

    Hello!   In NFPA 59A is there a 50 ft distance requirement from sloped LNG trenches (underneath LNG piping) to closest source of ignition such as generators, Electrical MCC equipment or Thermal oxidizers? C...
    last modified by sramanathan
  • Gas train on a flare classification

    I have a straight forward flare burning methane with a NG pilot line.  Where does 497 direct me for the classification of the equipment on this line? I am new to this and would appreciate the help. TG
    created by tgrubb
  • Cubic Foot Rule

    Cubic Foot Rule Good morning, NFPA 654 2020, N notes, where an explosion hazard exists, AMSs with a dirty side volume of 8 cubic feet or greater shall be located outside of buildings or adhere to N 9.7.1...
    created by curtlcorum
  • What is the proper PPE for an HVAC Technician?

      I work for an HVAC service and installation company providing service on residential, light commercial and industrial equipment. We have acknowledged that our current uniforms are lacking in the correct level o...
    last modified by rmiller@hamstraac.com
  • NFPA  58 [2014]:

    I cannot find information on the presentation of plans [drawings]  for the AHJ. Thank you for your help. Mario Berrios
    last modified by cowprophet
  • Does NFPA 30 apply to a class IIIA combustible liquid?

    Hello my question is regarding the applicability of NFPA 30 to a class IIIA combustible liquid. Suppose my mixture's flashpoint is at 150 degrees F. So it's not a "flammable liquid" under NFPA classification but only...
    last modified by allacademic
  • Flammable Storage cabinets

    Is there a code reference that prevents the storage of cardboard, paper, etc. within flammable cabinets?   I can only find the code that prevents storage of incompatible materials. Is there something more approp...
    last modified by bill.kapella@lmco.com
  • Ignition Sources in Appliances

    As part of our processing we shred tons of appliances.  Is anyone aware of possible ignition sources in appliances that have been shredded?  We have had a couple fires break out in these shredded piles, even...
    last modified by jdedario
  • We test products so sometimes we have a number of flammable aerosols.  How many can be stored on the lab bench ?

    We test products so sometimes we have a number of flammable aerosols. How many can be stored on the lab bench ?
    last modified by busbyamr
  • Diesel Fuel Storage Tank Fire Protection

    In one of my project (Fiber Cement board Factory) there is diesel storage tank of 15 m3. Below are my queries:    1) What fire protection system is required for this tank as per NFPA 30 or other NFPA standa...
    last modified by abdulrafay80
  • NFPA 496 Applied to Compressor Building

    NFPA496: This is a purge and pressurize standard that I have only ever seen applied to electrical cabinets located in Class 1 Div 2/Zone2 areas; and MCC or control rooms located within a Class 1 Div2/Zone 2 building.H...
    last modified by vginter
  • NFPA 496 Question

    NFPA 496 Question Using a purged enclosure with general purpose equipment in a CL1 Div 2 area . If the equipment brings a combustible liquid into the purged enclosure can you use air for the purge? Would an inert p...
    last modified by kpenson
  • Distance between power transmission line and storage of flammable liquids (Petrol, Diesel)?

    Does any NFPA code provide safe distance guidelines between power transmission lines (high voltage) and storage of flammable petroleum products. (such as that on a gas station or petroleum depot) 
    last modified by haris_387
  • Questions concerning the judgment method and the safety action criteria for gas leakage from the LNG storage tank

    Title : Questions concerning the judgment method and the safety action criteria for gas leakage from the LNG storage tank   In order to complete the safety management standards of LNG storage facilities in K...
    created by dkbaek
  • ESD and Hazardous waste storage

    We have some 55 gal drums of flammable waste on site.  We keep them grounded with clamps to prevent static discharge.  Should we connect them through a resistor to slow the discharge and prevent sparking whe...
    created by stephen.mcdonald
  • NFPA terms (division/Zone)

    Hi,  In the NFPA 497 we speak about "division" and "zone". But, the area around figures still the same even if we speak about zones or divisions. Someone can tell what is the differences between this two terms ...
    last modified by ddufour
  • Parking Smoke system

    For parking smoke system, what is the max. number of smoke zone that can be connected to one smoke fan?
    last modified by amr.elkranfely