4" CMU partition between areas. Craig L. Prahl, CET Fire Protection CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected]
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Tuesday, April 03, 2012 12:01 PM To: [email protected] Subject: RE: mixing densities in same calculated area The calcs need to be redone to include a 3000 sqft remote area in the 0.40 space. Hydraulically more remote. Is it a rated wall between the 0.17 and 0.40? K factors can be mixed (think regular heads and XCOV sidewalls). Also, read A11.2.3.2.1.1 (2002) At 11:50 AM 4/3/2012, you wrote: >But I don't have a 3000 sf design area for the 0.40 density area. This is >palletized storage of group A plastic and Class IV commodities. Total square >footage for the room is almost 5,000 sq. ft. > >Craig L. Prahl, CET >Fire Protection >CH2MHILL >Lockwood Greene >1500 International Drive >Spartanburg, SC 29304-0491 >Direct - 864.599.4102 >Fax - 864.599.8439 >CH2MHILL Extension 74102 >[email protected] > > > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of Cahill, >Christopher >Sent: Tuesday, April 03, 2012 11:44 AM >To: [email protected] >Subject: RE: mixing densities in same calculated area > >Sounds like the difference between the room design method and the area density >method. Stay within the room regardless of shape of RA or minimum length >along the BL? I don't think the standard tells us which to use. If they >crossed the wall sounds like area density and there are very specific rules on >the shape of the area. And if the walls aren't rated the only choice the >designer has is 1.2 * 3,000^0.5. If that takes them into the 0.17 area so be >it. > >Chris Cahill, PE* >Senior Fire Protection Engineer, Aviation & Facilities Group >Burns & McDonnell >8201 Norman Center Drive >Bloomington, MN 55437 >Phone: 952.656.3652 >Fax: 952.229.2923 >[email protected] >www.burnsmcd.com > >Proud to be one of FORTUNE's 100 Best Companies to Work For >*Registered in: MN > > > > > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of >[email protected] >Sent: Tuesday, April 03, 2012 10:18 AM >To: [email protected] >Subject: mixing densities in same calculated area > >Got a submittal package where the contractor has two divided rooms. One is >0.40/3000 and adjacent room is .17/2000. He is calculating the .40 area and >has extended his hyd remote area beyond the wall of the room into the adjacent >.17 area and calced about 8 heads. >The .40 room is plenty large enough to allow the additional sprinklers to be >calced from within the room. > >Off the top of your head does anyone know where this type of thing is >addressed within NFPA 13? > >Craig L. Prahl, CET >Fire Protection >CH2MHILL >Lockwood Greene >1500 International Drive >Spartanburg, SC 29304-0491 >Direct - 864.599.4102 >Fax - 864.599.8439 >CH2MHILL Extension 74102 >[email protected] > >_______________________________________________ >Sprinklerforum mailing list >[email protected] >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >_______________________________________________ >Sprinklerforum mailing list >[email protected] >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >_______________________________________________ >Sprinklerforum mailing list >[email protected] >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.com _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
