There is room in the freezer, but we also have to protect the concealed space above the freezer. Still pricing to see which is less expensive, one system with dry pendents and detection in the concealed space, or 1 preaction system in the cooler with SSUs and 1 wet system in the concealed spaces.
The benefits to the single interlock are that the capacity issues go away. We may need 2 or more preaction systems to protect the area with double interlock. 25' of storage and moderate water supply. Pipe is going to get big in a hurry, therefore, capacities get big in a hurry. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Monday, May 04, 2009 10:50 AM To: [email protected] Subject: Re: Preaction: single vs double Is there no room within the freezer considering there is a 10yr inspection cycle on dry pendent sprinklers and a slightly higher cost? The 30% increase on ALL preaction systems for storage (not occupancy hazard approach) has gone through a dance to get to ALL doing it. In the 2002 ed, you had the option of not applying a 30% increase if you could PROVE the water would discharge as quickly as a wet pipe system (under the old adage that the detection went off first so not an issue). That casual philosophy is fine for a less demanding scenario but storage can rock and roll so in 2007 it was acknowledged that we didn't really have a lot of confidence in proving the comparison and simply required ALL to have the increase. Roland On May 4, 2009, at 10:17 AM, Travis Mack, SET wrote: > We have a cold storage warehouse where the owner wants a preaction > system. > The piping will run in a heated, combustible concealed space above the > cooler/freezer. The cooler will be supplied with dry pendent > sprinklers. > There is going to be a capacity issue with this system if it is double > interlock. If we go with single interlock, doesn't the capacity issue > go away? Because this is storage, I believe we will still need to > have the 30% increase in design area, correct?? Also, can I grid a > single interlock preaction system protecting a storage occupancy? > > Thanks in advance for your help. > > Travis > _______________________________________________ > Sprinklerforum mailing list > http://lists.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 http://lists.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) __________ NOD32 4052 (20090504) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com _______________________________________________ Sprinklerforum mailing list http://lists.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)
