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Thank you for your helping SprinklerDesigner2. IMO for the area limitation in FM Stardard it depending on time. (60 sec alarm after trip inspector's test connection) is that right?

Hi i'm designing Extended Coverage sprinkler for warehouse that stored palletized of exposed non-expanded plastic. Ceiling Height 7.0 m. Storage Height 3.6 m. Per NFPA 13 Chapter 24 i did't see using of K25.2EC criteria for exposed non-expanded plastic but FM Data Sheet 8-9 Table 5. said i can...

I'm designing warehouse the stored rubber on rack (Open portable tire rack). Building Height = 12 meters , Rack Height = 10 meters Only ceiling sprinkler isn't enough. Can i use chapter 25.8.2 NFPA 13 to protect the rubber. if chepter 25.8.2 will not work please tell me another choice. Thank You.

Thank you for your response UFT12. You help me a lot.

I'm designing automatic sprinkler system for roll paper. NFPA 13(2019) said i will have 250 gpm 2 hours but NPFA 13 (2016Edition) said i will have 250 gpm 1 hour. Which one is correct. Thank You.

Thank you for helping me. You both help me a lot,sir.

Hi , i'm just curious the reason to have alarm check valve in the system. I heard someone say " to reducing corrosion ,to avoid unwanted alarms " . Dose anybody have other reason to install alarm check valve ? Thank you for helping.

Sorry for my bad english and vague question. For the portable LPG storage room REQ Density 0.5 gpm/sq.ft (ref NPFA 15 for Water Spray System) Per your advice i must use medium velocity sprinkler nozzle.

I'm curious how's different between standard sprinkler that without glass bulb and medium velocity spray nozzle. Can i use standard sprinkler that wihtout glass bulb instead medium velocity spray nozzle? Thank you for helping me.

Thank you for your help UFT12.

Thank you for your response. I just still wonder ,In the NFPA13 chapter 21 said that i can use K8.0 for density 0.2 gpm/sq.ft to 0.34 gpm/sq.ft and spacing them 4x3 m.(12 sq.m)(Table 10.2.4.2.1(d)) Is that correct?

I'm designing automatic sprinkler system for Chloroprene rubber (commodity class 4). Ceiling height : 4.4 m. Top of Storage : 3 m. (Palletized) Pallet Material : Unreinforced Polypropylene Comodity Class : Class 4 -----> Unexpanded Group A Plastic Density : 0.2gpm/sq.ft @ 2500 sq.ft...