In other words, a light hazard occupancy with two different areas of coverage depending on the type of head? Sounds like the engineer is concerned about the response time of the concealed heads vs the recessed. Maybe he/she attended a recent performance design seminar and doesn't realize we are dealing with rules and not engineering design. Are the concealed installed at a higher elevation than the recessed? NFPA 72 adjusts detector spacing for ceiling height, but so far NFPA 13 does not build this in. Are you in charge of selecting the sprinkler type?
Bill Brooks William N. Brooks, P.E. Brooks Fire Protection Engineering Inc. 372 Wilett Drive Severna Park, MD 21146-1904 410-544-3620 410-544-3032 FAX 412-400-6528 Cell -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mike Hill Sent: Friday, April 08, 2011 9:39 AM To: [email protected] Subject: Concealed Sprinklers Limited to Ordinary Hazard Spacing This may have been covered in the past, but I did not see any mention of it. Recently we have seen contract specifications requiring that concealed sprinklers be spaced for ordinary hazard requirements, while allowing recessed sprinklers to be spaced for light hazard requirements in the same space. Does anyone know where this requirement may be coming from? Want to make sure I didn't something. Michael Hill Vice President Phoenix Fire Protection, Inc. (301) 669-7066 _______________________________________________ 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)
