Good Morning Cliff: Same cross main until area requirement is met. 22.4.4.1.1.3 In systems having branch lines with an insufficient number of sprinklers to fulfill the 1.2 requirement, the design area shall be extended to include sprinklers on adjacent branch lines supplied by the same cross main.
Olie Olson, P.E. Fire Protection Design 406-860-3170 mobile 406-628-2314 office -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Cliff Whitfield Sent: Thursday, August 23, 2012 9:21 AM To: sprinklerforum@firesprinkler.org Subject: Remote Area Question Forumites, I have a question regarding a remote area on a 'skinny' building and since we can't include a 'snapshot' I will do my best to describe the situation in question. Picture a 80' x 400' building with a 1/12 slope and the peak at the center of the building (40'). This is a dry system on a loading dock for a trucking company. I have a main on both sides of the building (but not connected in a loop) with lines running up the slope so everything will drain properly, thus my lines are approx 40' each and do not connect in the middle (not a grid - it's dry). My remote area is to be 1.2 x the sq root of 1950 (just using this as an example) so I will need at least 53' of branch line. Since my branch lines are only 40' wide, obviously I have to cross the peak to pick up the proper number of heads for a line. Herein lies the problem. I don't believe this is clearly spelled out in NFPA 13 (if it is, please forgive me but also tell me where it is!). Do you cross the peak and pick up heads on lines that are connected to the opposite main or do you stop at the peak, widen the remote area to include more branch lines and make all of the heads flow thru the single main back to the riser? This can arise in a similar fashion in an office building, especially if you are looping the system on the floor. The question I have is - which solution is required/correct in accordance with the way NFPA 13 is written. Thanks, Cliff Whitfield, SET President Fire Design, Inc. Ph: 337-261-8807 Fx: 337-261-8808 cl...@fire-design.com www.fire-design.com _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
