Sorry, for storage... 12.5 Dry Pipe and Preaction Systems. 12.5.1 For dry pipe systems and preaction systems, the area of sprinkler operation shall be increased by 30 percent without revising the density.
Duane Johnson, PE Program Manager Division of the Fire Marshal (Contractor) Office of Research Services National Institutes of Health 301-496-0487 "Protecting Science - One Sprinkler at a Time" -----Original Message----- From: Johnson, Duane (NIH/OD/ORS) [C] Sent: Monday, June 30, 2014 10:59 AM To: '[email protected]' Subject: RE: Identification of preaction system types 11.2.3.2.5 Dry Pipe and Double Interlock Preaction Systems. For dry pipe systems and double interlock preaction systems, the area of sprinkler operation shall be increased by 30 percent without revising the density. Duane Johnson, PE Program Manager Division of the Fire Marshal (Contractor) Office of Research Services National Institutes of Health 301-496-0487 "Protecting Science - One Sprinkler at a Time" -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Monday, June 30, 2014 10:55 AM To: [email protected] Subject: RE: Identification of preaction system types Thanks for all the input. I don't have access to the releasing panel. The hydraulic placard gives no indication of the system type. Design data is 0.26/4000 but that lines up exactly with the 1978 NFPA 231 for Class IV commodities so no real help there. It doesn't appear they provided for the 30% increase for dry system. I thought I had seen at some point in time within NFPA 13 that one of the preaction system types (I believe it was single interlock) were considered the same as wet due to water filling pipes before sprinkler operation and therefore did not require the 30% increase in design area. I can't seem to find that verbiage in past or present NFPA 13 Standards now that I'm looking for it. Any clues or was I mislead? I have Engineer's drawings from 1982, no contractor shop drawings or calculations. There are no data sheets. There are no test reports. Yes, I love impossible challenges.......................................to a point. Craig L. Prahl -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Izzo, Salvatore Sent: Monday, June 30, 2014 10:25 AM To: [email protected] Subject: RE: Identification of preaction system types If the warehouse is unheated, that is, if there is a chance of freezing, it is my opinion that it would be doubtfulto find a single interlock preaction system; therefore, it would likely be a double interlock. You could look at the design area on the hydraulic placard ( if there is one) as one way of making the determination. Take a look at the trim, and if you do not see a pneumatic actuator in addition to the solenoid, it is likely that it is an electric-electric type double interlock system. This can be verified by looking at the releasing panel input zones and determining if the low air pressure switch is wired into an alarm zone rather than a low air supervisory zone. Of course, you can verify the manufacturer and compare to the data sheets as well. Regards, Salvatore J. Izzo III, P.E. SFPE Manager - QA/QC Operations Insurance Services Office Verisk Commercial Real Estate 545 Washington Blvd. Jersey City, NJ 07310 - 1686 t 201.469.2486 f 201.748.1942 c 732.533.7927 [email protected] www.verisk.com/insurance Verisk Insurance Solutions ● ISO | AIR Worldwide | Xactware -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, June 30, 2014 9:13 AM To: [email protected] Subject: RE: Identification of preaction system types Ok, So what would be the tell-tale difference? Craig L. Prahl -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Johnson, Duane (NIH/OD/ORS) [C] Sent: Monday, June 30, 2014 9:12 AM To: '[email protected]' Subject: RE: Identification of preaction system types Nope. You have to look at the trim on the preaction valve. Duane Johnson, PE Program Manager Division of the Fire Marshal (Contractor) Office of Research Services National Institutes of Health 301-496-0487 "Protecting Science - One Sprinkler at a Time" -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Monday, June 30, 2014 9:09 AM To: [email protected] Subject: Identification of preaction system types Can you identify the type of preaction system installed just by looking at the system riser? I have a warehouse, unheated, Preaction system of unknown type. There are heat detectors at the roof deck and there is a small air compressor. That's all I've got to go on. I can make assumptions all day long, but no assumption is better than an incorrect assumption at this point. Craig L. Prahl _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
