• 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 ...
    last modified by nfpaunilev
  • Recommendations for separation distances between outdoor transformer and buildings

    Hello Everybody,   One of our application transformer was located very close to control building. We are not able to keep required safety distance from transformer to the control building. So, we are looking...
    last modified by bcelikel
  • How can calculate Header Pipe Dimension?

    Hi I have a question about collectors piping at spray system fire fighting.  actually, we have a collector at piping with many outlet of it and I want to understand about calculation of them please follow un...
    last modified by yousef
  • Hazardous Areas

    I'm looking for a digital version of "Electrical Installations in Hazardous Areas" 3rd ed or later; Authors Schram/Beneditti/Earley. I have a hard copy, but with with all the remote work happening it's hard  to s...
    last modified by budd.hipp
  • 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
  • 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
  • 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
    created by mohammedelassall
  • GFCI and Water Heater

    Are GFCI receptacles required within a certain distance of water heaters in a commercial building mechanical room?   Thanks in advance for any guidance.
    last modified by shanna.gonzales
  • What is your opinion about: Safety Instrumented Fire & Gas Systems?

    Dear Sirs.- I would like your opinions about Fire and Gas Systems and Safety Instrumented Systems
    last modified by guillermov
  • NFPA 505, OSHA 1910.178

    In OSHA Standard 29 CFR 1910.178, Powered Industrial Trucks, Table N-1 References the NFPA at the bottom of the table, with Reference #'s for NFPA 505, that I have not been able to find.  Can someone help redirec...
    last modified by matthew.goodall
  • Hazardous area classification (HAC) of interstitial spaces.

    I am involved in the construction of a large plant. The plant utilizes and distributes numerous flammable liquids and/or gasses (the primary ones being ethanol and formic acid). In certain areas this distribution and ...
    last modified by rrwo
  • Electrical PPE Catagory requirements

    how do I determine PPE catagory requirements if worker is in panel, one side of panel has  240v (or less,) and on other side of same panel is live 480, however no work is to be done to the 480v side, only on the ...
    created by mr.kc.collins
  • NFPA 820 - Delineation Between Classified and Unclassified

    I have a two story WWTP where the wet well is located at the lower level, and directly above is a chemical storage area.  The chemical storage area requires and emergency shower, which requires a floor drain....
    created by gavin.don
  • I need to Buy handbook for design&installation fire protection system

    I need to use handbook for design&installation fire protection system in Building , Factory , Hospital , School on my job. (Mechanical system) Please tell me about Important handbook. I need to Buy.   1. NF...
    created by bancha
  • Fire shutter for gas house conveyor entries

    Dear all,   Does anyone have a recommendation for a fire shutter supplier for conveyor openings into and out of a gas house.   Many thanks Ross Hollands
    last modified by ross.hollands
  • Possibility of vehicle fire (before sales)

    I’m writing to ask a favor of you.   We has been discussing with Shanghai port authority to provide Automated Storage and Retrieval System (ASRS)for finished cars. FYI, we are attaching photos of the ASRS....
    last modified by noguchi