By definition, a "Branch Line" is piping that connects a single hose connection 
to a standpipe.  Per NFPA 14, §7.6.3, branch piping shall be based on the 
hydraulic criteria of §7.8 but not smaller than 2½".  Since you're at the base 
of a standpipe and not near the presumed remote area, I'd say it's likely that 
2½" is adequate.

The foregoing is my opinion only and is not intended to represent the NFPA 14 
Technical Committee, nor serve as an interpretation of the standard.

Steve Leyton
Protection Design & Consulting
San Diego, CA

From: Sprinklerforum [] On 
Behalf Of Rocci Cetani 3
Sent: Wednesday, August 09, 2017 8:24 AM
Subject: standpipes

I have a situation where my 6" standpipe is coming into stairwell @  16' AFF 
can I drop down 11' (to get to my max 5 AFF)  with 2.5" to feed the hose valve 
on the 1st floor or does it need to drop down  6" with a 2.5" outlet?

Thanks in advance Mr. Leyton for your assistance :)

Rocci Cetani III, CET
Senior Designer
Water-Based Fire Protections Systems Layout, Nicet Level III

Northern California Fire Protection Services Inc.
16840 Joleen Way Bldg. A
Morgan Hill, CA 93037
P-(408) 776-1580 EXT.111
F-(408) 776-1590<><>

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