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 [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Rocci Cetani 3 Sent: Wednesday, August 09, 2017 8:24 AM To: email@example.com 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 roc...@norcalfire.com<mailto:roc...@norcalfire.com> www.norcalfire.com<http://www.norcalfire.com/> CONFIDENTIALITY NOTICE: This message and any document accompanying it may contain confidential information belonging to the sender. The information is intended only for the use of individual or entity named above. If you are not the intended recipient, or the employee or agent responsible to deliver this message to the intended recipient, you are hereby notified that any disclosure, copying or taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this transmission in error, please immediately notify us by telephone to arrange for return of the documents.
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