NFPA 13 states that for hydraulically calculated sprinkler systems the fire department connection (FDC) pipe can be less than 4-inch diameter, but not less than the system riser.
What size should the fire department connection feed pipe be for a 6-inch riser, or an 8-inch riser?
Can the FDC pipe still be 4-inch for these larger risers?
I have some clients believe that 4-inch is the maximum no matter what, and some say if the riser is 6-inch or 8-inch that the FDC pipe needs to match the larger riser size.
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