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FDC Pipe Size

Question asked by aten on Sep 8, 2020
Latest reply on Sep 24, 2020 by cdafd



I am looking for an official interpretation regarding NFPA 13's FDC Pipe Sizing Guidelines. gives contradictory and unclear guidance for this matter and I am in need of NFPA's interpretation and intent of the code. 

- The way I read 2016 NFPA 13 is that the FDC pipe sizing must be in accordance with ONE of the following: which means that 4" piping will suffice regardless of the riser size, whether it be a 2" riser or an 8" in accordance to line #1. I read line #3 only as a means to achieve FDC piping smaller than 4". Please let me know your thoughts and interpretation.


Thank You,