Adding a new Fire Department Connection to an existing building with a 4-inch combination standpipe and 2-1/2 inch mains feeding each level. The standpipe is significantly farther from the new FDC location; however, the 2-1/2 inch feed main is located closer to the new location.
Is it acceptable to connect the 4" FDC pipe to the 2-1/2" main, or do we need to route the pipe back to the standpipe location?
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10/16/2020 10:06:13 am
It defies the purpose of the FDC if you don't route it to where it can get to the standpipe that is supplying the sprinklers. I don't think this will fly. The FDC itself can be far from the supply standpipe if it has to be. Its purpose is to charge the system from the FD. NFPA 14 really only mandates that the FDC be within 100' from a hydrant. I've seen FDCs routed way across buildings because of the access grade.
10/16/2020 10:07:03 am
I think you must have the FDC piped directly into a riser or bulk main servicing both the fire sprinkler system and all standpipe risers. See NFPA 14:7.12.2.
10/16/2020 10:48:25 am
Without knowing the exact piping configuration, I will make some assumptions. All Combination Sprinkler/Standpipes are fed from a Manifold configuration in the riser room. The manifold, would be the tie in point, after the discharge side of a pump (if installed). This arrangement allows the FDC to supplement flow to ALL systems.
10/16/2020 12:31:48 pm
You may NOT tie the FDC into the 2-1/2" feed main. NFPA 13 requires that the FDC be connected to a main that is, at minimum, the same size as the main system supply, so in this case, that would be a 4" main. Additionally, if you tied into the 2-1/2" floor main, the FDC would only service the floor that the main served.
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