FM has come a long way, baby. As far as I've been able to tell you're on the money, only ceiling slope bumps you to the 1.4 "shape factor". You know they dropped their aboveground velocity guidelines in most instances other than that you "should" use Darcy if you're calcing over 30 ft/sec also? There are some new restrictions that are pretty tough though, the non flat obstructions over 4' wide rules are pretty harsh at 4' on center spacing even in non-storage occupancies. Mike Morey, SET, CFPS Sprinkler Designer BMW Constructors, Inc. O: 317.651.0596 | C: 317.586.8111 www.bmwc.com
________________________________ From: sprinklerforum-boun...@firesprinkler.org on behalf of Brad Casterline Sent: Mon 5/21/2012 2:02 PM To: sprinklerforum@firesprinkler.org Subject: Factory Mutual 1.2 or 1.4 Before this past Saturday morning, if asked, I would have said "I don't think FM requires 1.4 anymore, especially if it is not a high risk occupancy". But before Friday afternoon I was not even aware of FM Data Sheet 3-0 HYDRAULICS OF FIRE PROTECTION SYSTEMS. On page 21, for the Density/Demand Area Format, in a nutshell it says 1.2 for ceiling slopes less than or eq. to 5 degree (1 in 12 i think), and 1.4 for slopes greater than that! Friday I had been reading the product data of a sprinkler head that I had seen Advertised in a mag. (be careful if FM is not the only AHJ) and I saw the above 1.2/1.4 requirement. It was a freak coincidence to shortly realize that it had come from FM, not the manufacturer. Is any one aware of this? Am I just "seeing things" here? Is there more or less to it? thanks, Brad Casterline, NICET IV Fire Protection Division FSC, Inc. P: 913-722-3473 bcasterl...@fsc-inc.com www.fsc-inc.com Engineering Solutions for the Built Environment -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120521/d9044fff/attachment.html> _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum -------------- next part -------------- A non-text attachment was scrubbed... Name: winmail.dat Type: application/ms-tnef Size: 5338 bytes Desc: not available URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120521/50c49e57/attachment.bin> _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
