• What is preferred elevation of hydrogen gas transmission pipeline?

    A hydrogen gas transmission pipeline (~300 psi) will be constructed just outside my factory fenceline in China, along the plant entrance road .  Is it safer for this line to be installed underground or ...
    created by daniel.lewis
  • Hot work on membrane roof

    How is it possible to install a membrane roof system that requires an open torch for the intallation process and be compliant with NFPA 51B "Hot work shall not be attempted on a partition, wall, ceiling, or ro...
    last modified by robert.nii
  • NFPA 51B - Fire Watch / Welder

    Good Morning All,   I have a questions regarding NFPA 51B, does welder during the welding work can be also Fire Watch in accordance with NFPA 51B?? If there are two persons, that is obvious, but in case of one p...
    last modified by seb.nowak0
  • Use of Plated Aluminum Components with Methanol

    NFPA 86 Standard for Ovens and Furnaces states the following: Use of aluminum or lead components, including solders that contain lead, or other incompatible materials in tanks, piping, valves, fitting...
    created by cthomas86
  • Dike Wall for LPG storage

    Hi Experts,   What is the requirement of dike walls for large LPG storage vessels?   Please support your answer with a code.       Thank you, KNK
    last modified by nav822nav
  • State of ILLINOIS pressure vessel registration and inspections

    In the state of IL do pressure vessels (in this case air compressor receiver tanks) require registration and inspection by the office of the state fire marshal?   Thanks,
    last modified by mielemaster
  • Fire prevention during hot work. How close does a fire extinguisher need to be to the area in which you are welding, cutting.. etc...?

    Fire prevention during hot work. How close does a fire extinguisher need to be to the area in which you are welding, cutting.. etc...?   I have read through NFPA 51B,  and ANSI 249.1. Both documents state t...
    last modified by mhphelps
  • Container for IIIB liquids in Warehouses

    9.4.1 NFPA 30 (2015 Ed.) does not regulate containers for IIIB liquids unless the building is considered protected storage, see the Annex A note. One possible interpretation is that if one wants to bring IIIB liquids ...
    last modified by awiley
  • Staircase - firerating of "I" section structure

    Hello,   In my mall project, the staircase enclosure is 2 hr. fire rated as per NFPA - 101. The staircase is constructed in well load "I" section structures from 10th level of multiple basement to ground level a...
    created by sourabhchowdhuri
  • How to cross check the LPG tanks safety distances mentioned in NFPA 58

    Hi Everyone   The safety distances mentioned in NFPA 58 for LPG tanks storage is on basis of any calculations or it is as per some practical knowledge of some experts?  how can we calculate the distanc...
    created by nav822nav
  • Fire Protection Requirement for Conveyor Belts in Milk Factory

    This is with regards to a milk factory for which we are designing a fire fighting system. There are various packaging machines/conveyor belts in the factory which are of Stainless Steel make. Conveyors are made of sta...
    last modified by dkb.1990
  • 110.26(A)(3) - Working Space Height Requirements

    Hello,  Is there an exception to the 6.5ft overhead clearance?  Specifically I have a 24" x 24" junction box that only has 24VDC in it and would like to mount it onto a machine that will house an IO rack. (...
  • Safe distance between Engine exhaust and Fuel tank. A 300 Kva diesel engine exhaust silencer pointing towards a diesel tank of (capacity 35000 liters).

    I need to know the safe distance between 300 Kva diesel engine exhaust silencer pointing towards a diesel tank of (capacity 35000 liters).   We have a huge Diesel tank with its retaining boundary wall around the...
    last modified by afzaal
  • National Foam Calculations

    Is there a standard national equation used to calculate foam flow that can be adjusted for all types of foam?  
    last modified by olde
  • Can an ESFR Sprinkler be used on a ceiling slope exceeding a pitch of 2 in 12 ?

    In NFPA 13 - 2016 it's clearly stated at that ESFR sprinklers shall be installed only in buildings where roof or ceiling slope above the sprinklers does not exceed a pitch of 2 in 12 (a rise of 2 units in a ru...
    last modified by omar.dargham
  • Exhaust fan / sprinkler head / classified space FAS shutdown

    I am installing exhaust fans in an industrial plant that is C-I D-I. the  fans will replace passive ridge vents. Each fan will move +30K cfm. In the center of the opening below each fan is a sprinkler head. I hav...
    last modified by eddy_harkins
  • Cableless Controls

    Our current project is implementing a cableless control, and clarification is needed on two points in NFPA 79, 9.2.7.   What is needed to fulfill the memory verification requirement of When are prede...
    created by mdkrum
  • dry pipe system in basements - how is it suitable

    Dry riser system to be given in basements of a mixed occupancy of a mall. The mall is having 10 basement parking level. As per NFPA; how it could be considered to design. Dry riser / pre - action system to be followed...
    created by sourabhchowdhuri
  • UL94 Flammability testing

    I am looking for information on the applicable standard to reference when setting up a burn chamber for UL94 Flammability testing.  
    last modified by aflorin
  • NFPA 58 Piping Gasket Materials

    In section of NFPA 58, is the requirement for a 1500F melting point for the metal material only or also the material confined within the metal of a gasket. We are considering a spiral wound gasket for flange...
    last modified by clyde.beer