1. Move the wall, yes many times when pointed out the GC or owner moves. Or cut the new head in and move existing as necessary. Usually it's 1 new and move 2. But in small rooms it becomes challenging if it's only 4 or five heads wide. Reality is it probably doesn't make a difference. If the fire starts under the mis-spaced head it probably goes out. If not under the mis-spaced it probably goes out with the regular coverage. FM is now allowing/requiring 4' OC under obstructions based on that thinking.
2. I don't see why the ESFR above can't stay. Your description leads me to believe sprinkler above are not even required. You say no EXPOSED combustibles (with taking care of the almost). And even so the ESFR is a fast response head, just like QR. There are only two types of response times FR and SR. Or RTI <50 or those >80. I know ESFR in non-storage is a debate and in THIS case I'd be OK with leaving. 3. Can't say I've seen ESFR in a ceiling either. Just don't semi-recess is, I think, the only issue. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ralphy Henderson Sent: Monday, June 14, 2010 12:34 PM To: [email protected] Subject: ESFR Questions Hi All, I wanted to run a few questions past the forum here on ESFR's. 1.) I have a situation where spacing is at 10x10 but a new wall is making an existing sprinkler 5'-10" off the wall which means I will have to add a sprinkler between the existing ESFR and the wall BUT code says ESFR's can't be any closer than 8 feet. Any guidance on this? 2.) I have a mostly noncombustible interstitial space between a new grid ceiling and the roof deck. By mostly I mean steel bar joists throughout but with a wood roof deck which is almost completely covered by noncombustible insulation. I figured the existing sprinklers above the grid ceiling will remain however they are ESFR. Can an ESFR remain as protection of the interstitial space? Below the grid ceiling is storage occupancy requiring it's own ESFR's. My gut is telling me NO since wouldn't the interstitial space be light hazard therefore requiring quick response sprinklers? 3.) All the ESFR systems I've done in the past were in warehouses without ceilings with everything open to the structure above. In this new case there is a grid ceiling going in some of this warehouse with storage below. I didn't see anything in the code prohibiting ESFR's in lay in ceiling situations but it seems kind of out of place - maybe it's just because I've never seen it before but I wanted to verify here. Thanks in advance to all who answer! _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
