My bet is they are trying to get away with some improper hydraulic calc benefit...like balance the system using different K-factors or using lower flow rates (improperly) from Res sprinklers.
Duane Johnson, PE Program Manager Division of the Fire Marshal (Support Contractor) Office of Research Services National Institutes of Health 301-496-0487 -----Original Message----- From: Greg McGahan [mailto:[email protected]] Sent: Tuesday, April 27, 2010 8:32 AM To: [email protected] Subject: RE: Mixing residential/qr heads 13R - You can use QR heads in HVAC closets etc, or you can use them if there are less than 4 heads in a dwelling unit. Otherwise, you can't use them in the dwelling unit. 13 - You can mix them as far as I can tell from 8.4 but then you lose the 4 head residential calc if they are mixed in one compartment and then you have to fall back on another method. If you use the room-design method, you will have to expand the calcs to the communicating spaces which has never been advantageous to me vs using all res heads. The price of Res vs QR heads is comparable so I wonder what the reason would be for not using all res heads anyways? Greg McGahan Living Water Fire Protection (850) 937.1850 | Fax (850) 937.1852 | Cell (850) 554.3231 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dewayne Martinez Sent: Tuesday, April 27, 2010 6:14 AM To: [email protected] Subject: RE: Mixing residential/qr heads 13 or 13R? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of A.P.Silva Sent: Monday, April 26, 2010 11:46 PM To: [email protected] Subject: RE: Mixing residential/qr heads To clarify, each residential compartment contains both res and qr heads. Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of A.P.Silva Sent: April 26, 2010 10:40 PM To: [email protected] Subject: Mixing residential/qr heads Reviewing a drawing where the designer has both residential and quick response heads in a dwelling unit. A res head is installed where the coverage is required to be EC. In other areas non-residential QR sprinklers. First, I don't think there's a problem mixing heads. Is that correct? Second, can room design method be used, provided minimum 4 heads are calcd.? Tony _______________________________________________ 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) _______________________________________________ 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) _______________________________________________ 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)
