Thanks Ed, I missed the one about the K-factors. I took a look at the inspections tags and the dry system has 70sec trip times so it looks like a wet system is the way to go. We could retrofit the valve with an electronic accelerator but Tyco states to only expect the trip time to get about 20sec better.
Dewayne *From:* Sprinklerforum [mailto: [email protected]] *On Behalf Of *Ed Kramer *Sent:* Thursday, April 06, 2017 11:47 AM *To:* [email protected] *Subject:* RE: NFPA 13 dry system - residential sprinklers A couple of things to consider: - Section 8.4.5.2 – can’t use residential sprinks on a dry system unless specifically listed for dry systems. - Section 8.3.4.1(2) – Unless the pipe is galvanized or otherwise corrosion resistant, minimum K-factor is 5.6. So you’ll need a residential sprink that is listed for dry systems and is K5.6 or greater. Ed Kramer *From:* Sprinklerforum [ mailto:[email protected] <[email protected]>] *On Behalf Of *Dewayne Martinez *Sent:* Thursday, April 06, 2017 8:13 AM *To:* [email protected] *Cc:* [email protected] *Subject:* NFPA 13 dry system - residential sprinklers NFPA 13 (07ed) I have an existing 5th floor shell space that is installed as a light hazard dry system that has pipe in the shell space and in the attic. They are turning this floor into a dormitory (R-2). 1)Can I use listed residential heads on return bends and only pick up 4 heads per 11.3.1.1 or will I need to pick up 1950SF? What if there are incidental areas such as a laundry room, ect. in the same areas as the dorm rooms? 2)What would be the required trip time be per Table 7.2.3.6.1? 15sec for residential or 60sec for light hazard? Thanks, Dewayne Martinez Fire Protection Design Manager *TOTAL Mechanical* *Building** Integrity* W234 N2830 Paul Rd. Pewaukee, WI 53072 [email protected] Ph: 262-522-7110 Cell: 414-406-5208 *http://www.total-mechanical.com/ <http://www.total-mechanical.com/>* [image: cid:[email protected]] [image: cid:[email protected]] [image: cid:[email protected]] [image: Top Workplaces 2015] *TOTAL Mechanical voted “Top Workplace” for a 4th consecutive year. *
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