Hello, You don’t say how tall the building is? or how high the storage is in the racks?. I assume you are using the NFPA 13 requirement for exposed expanded plastics up to 35' high in a 40' building, = K25.2 @ 60 psi. But is under 30ft roof height then you can store to 25' and K25.2 @ 30 Psi..
You may also want to look into putting a combination of roof sprinklers and in-rack sprinklers to accomplish this. Are there smoke and heat vents in the building? If so and a roof height of 27' or lower, you could do the special design of .60/2000 with standard heads. Have a good day. Anthony Carrizosa Project Manager | Fire Protection 7855 S 206th St Kent, WA 98032 Cell: 206-679-5283 | Office Dir: 253-341-4593 -----Original Message----- From: Gerzayn Fuentes @ KOLTEK.MX <[email protected]> Sent: Friday, July 19, 2024 12:59 PM To: [email protected] Cc: Francisco Reveles @ Koltek.mx <[email protected]> Subject: [Sprinklerforum] UUP / Plastics A unexpanded exposed Hello everyone! We are designing an expansion project for an Plastic A Unexpanded Exposed or UUP with racks warehouse. Design specification is 12K25.2 @ 60 psi + 250 gpm x 60 minutes. The existing pump is 2,000 gpm @ 120 psi, and an existing underground schedule 40 steel network is more than 10 years old. We are using a factor C=100. The above gives us 4" branch lines, 8" mains and a 10" riser, using 3 mains and it gives us the curve, but we need to lower the pipe diameters. We have never seen a 10" riser. We know that the problem lies in the capacity of the fire pump, and the client wants to save as much as possible and reduce the risk due to the structural load. Our question is, can we have a grid sprinkler system with 2 risers of 8" that feed it? We can't find anything in NFPA or FM Global standards that prevents this, but at the same time I've never seen a system like this installed. Greetings and we look forward to comments. -- Gerzayn Fuentes Campos / director general [email protected] México. https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.koltek.mx&c=E,1,u3yw4iqvZc_1R6_UWJmuBdWsV6MnSWXOqOd0EEoIvs-tDebRPmP3xnGEsvsMkLYHiZXHFGsWbGHRPCQyHx1y67ATpq-4F49u3rNzwtz3DWar&typo=1 -- <https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fexpofire.ownersys.com%2fregistro&c=E,1,9qXb9Qr5L8FdXHQMZI2hhLg-cV7GjUj5u93If2Wo-5usoFaBGHHCbzu7IJxpJTEy7JChz5WmaNePxybdhDLWbjL7e9PIijjJkSZN5OkQviefwmwWt0hC_kmRdw,,&typo=1> _________________________________________________________ SprinklerForum mailing list: https://linkprotect.cudasvc.com/url?a=https%3a%2f%2flists.firesprinkler.org%2flist%2fsprinklerforum.lists.firesprinkler.org&c=E,1,aqYFXpmPtEZ-GawQ2h5x7go6LRER_vjLLMJtbNRdPYbGVwu0JRqbDrcYZ0pu3YMuUKpiiF3jyqmBIYpKUEX5DEAf6RtePCPcawVeje8dUinrZHhfywMPPLxNC0k,&typo=1 To unsubscribe send an email to [email protected] _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to [email protected]
