• Subsurface Foam Injection

    The SFPE Handbook and various vendors advise that subsurface injection of foam is not recommended for internal, floating roof tanks.  Are there any studies or incidents that support this position? Thanks
    peter@dwan.ca
    last modified by peter@dwan.ca
  • Sulphur conveying system

    Hi I have been working in 1 project about conveying system for Sulphur in Sulphonation plant. I have been checking for some information about assessment due to combustible dust / flameable gas due to this work. I ...
    nfpaunilev
    last modified by nfpaunilev
  • Does attaching a snow plow to a 100LL aircraft refueler vehicle violate any fire regulation codes?

    I have this suspicion that attaching a snow plow to an aircraft refueler truck is not permitted, especially at a federally funded airport. It just sounds like a bad idea to put something that can create sparks on a ve...
    john3
    last modified by john3
  • 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. 
    eng_mikemo
    created by eng_mikemo
  • 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...
    sramanathan
    last modified by sramanathan
  • 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...
    allacademic
    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...
    bill.kapella@lmco.com
    last modified by bill.kapella@lmco.com
  • 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...
    abdulrafay80
    last modified by abdulrafay80
  • NFPA59-2019 Response modification Factor

    NFPA 59-2019 edition page 31, section 10.2.2.1 second para (2)  has changed the value of Rp=3, which was 6 in the previous edition. This doubles the seismic force. Is there any reson for this change. As per ASCE-...
  • 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...
    kpenson
    last modified by kpenson
  • 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...
    stephen.mcdonald
    created by stephen.mcdonald
  • Is it safe to make wet blasting on the top of crude oil floating roof tank

    if its not safe where i can find this issue from NFPA
    mohammedelassall
    created by mohammedelassall
  • shell to shell spacing

    there is a methanol storage facilities; 4 double roof tank will be constructed in common dike area with clock wise arrangement  and diameter of   each tank is supposed to be 55 meters. based on Nfp...
    b.jabarzade
    created by b.jabarzade
  • Question regarding high voltage power lines

    Hi, I am looking for any guidance on separation distances between hazardous chemicals (both compressed gases and liquid oxidizers) and high voltage power lines. I have searched through the NFPA codes with little succe...
    tzeweiu
    last modified by tzeweiu
  • How many feet does an enclosed and latching lab oven need to be from a flammable storage cabinet in a laboratory space?

    How many feet does an enclosed and latching lab oven need to be from a flammable storage cabinet in a laboratory space? NFPA 45? 
    acanestri
    created by acanestri
  • Grounding & Bonding Flammable Liquids

    Under the NFPA flammable liquid standard, it is necessary for the person to be grounded as well when transferring flammable liquids from one vessel into another? Is there any circumstance where the codes call for the ...
    ctuzzolo
    created by ctuzzolo
  • Listed PSV manifold in NFPA 58 for LPG storage?

    I was wondering what the intent of a listed manifold for PSVs is in NFPA 58, section 6.9.2.9. On our LPG bullets we have two independent lines communicating with the vapor space instead of a single manifold. Each line...
  • Proximity of Diesel Tank to Facility

    Good Morning, We have a 550 gallon diesel fuel tank that we would like to install outside our manufacturing facility in close proximity to an interior emergency generator as the fuel source for the generator. We can g...
    tchrisman
    last modified by tchrisman
  • Loading bulk containers inside of buildings?

    Good afternoon,    I've read through NFPA 30 looking for guidance on loading of liquid bulk containers inside of buildings.  NFPA 30 chapter 28.4.1 states that loading facilities for Class I liqui...
    matthew.meservy
    last modified by matthew.meservy
  • Commercial Propane Leak Detection System

    We are looking for a Propane Leak Detection System to have installed in to our 18,000 SqFt warehouse. We have 40+ Fork Lifts that we store inside at night. We've only been able to locate stand alone plug-in units. T...
    arsenk
    last modified by arsenk