Fire Flow Calc in NFPA 1 versus NFPA 1142
Fire Flow Calc in NFPA 1 versus NFPA 1142
(OP)
I'm working on project in a rural area of NY that has a municipal water supply. I need to determine the needed fire flow to the site and think I can use NPFA 1 to do this. Some suggested using NFPA 1142, but that is for rural or suburban areas where an adequate water supply doesn't exist. Since we are connecting to a municipal system that happens to have an elevated tank, I didn't think it applied. However, we have calculations based on both codes and are comparing the two. Our AHJ simply says to meet NFPA, but doesn't specify a section. FYI, our buildings are sprinklered so we are applying the 75% credit allowed by NFPA 1, Chapter 18. Even with the 75% credit the fire flow is greater than the sprinkler demands, so that governs the supply volume.
Does anyone know why NFPA 1 Table 18.4.5.1.2 omits occupancy and only considers construction type, while the minimum water supply calculation in NFPA 1142 4.3.1 uses both occupancy and construction type? Any suggestions for minimizing the required volume of storage? We are already accounting for fire separations in the buildings and counting them as separate buildings. Thanks for the input.
Does anyone know why NFPA 1 Table 18.4.5.1.2 omits occupancy and only considers construction type, while the minimum water supply calculation in NFPA 1142 4.3.1 uses both occupancy and construction type? Any suggestions for minimizing the required volume of storage? We are already accounting for fire separations in the buildings and counting them as separate buildings. Thanks for the input.





RE: Fire Flow Calc in NFPA 1 versus NFPA 1142
RE: Fire Flow Calc in NFPA 1 versus NFPA 1142
RE: Fire Flow Calc in NFPA 1 versus NFPA 1142
http://publicecodes.cyberregs.com/st/ny/st/b300v10...
RE: Fire Flow Calc in NFPA 1 versus NFPA 1142
102.6 Appendices. The following appendices have been adopted and are made part of this code:
Appendix D-Fire Apparatus Access Roads
It does not mention Appendix B - Fire-flow Requirements for Buildings
The NYS Fire Code states:
§F508.3 Fire flow. Fire flow requirements for buildings or portions of buildings and facilities shall be determined by an approved method.
What is this "approved menthod"? NFPA 1? IFC Appendix B? ISO?
This question regarding the "approved method" is what led us to examine both NFPA 1 and NFPA 1142 in the first place.
This is really good dialogue, so I invite others to comment especially if they have worked on fire flow in NYS.
Thanks!
RE: Fire Flow Calc in NFPA 1 versus NFPA 1142