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Scenario: 38-ft. roof, 32-ft. open frame double and multi-row rack storage of Class II & III Commodities. 45 deg warehouse. Wet sprinkler system at ceiling Double Interlock System for Racks Sprinklers (2 levels) with Linear Heat Detection located at ceiling only - along ceiling sprinkler...

Sorry - the most current version (April 2011) of 2-0 - Installation Guidelines for AS

Hi, I have what I thought was an easy one, but the more I look at FM 2-0, the more confused that I get! I have an 18-inch diameter LED light in a warehouse. It’s located 12-inches below the sprinkler head deflector. It’s a non EC, upright head. Question.. How far (horizontally) from a...

Thanks to all for the replies. Areas with aerosols, 3B's, and other hazards outside the given storage commodity are always calculated separately, but not always the typical Class III / IV commodities when many identical systems. I agree that ALL should be. I really like the idea of the general...

Thanks Cdafd. Glad that to hear that I'm not the only one that thinks that way. If anyone else can reference a Code section, that would help as well.

Hi, Are hydraulic calculations required for every sprinkler system in a large Distribution Center (or similar) where there are many systems, each having the same designs and piping layouts. I seem to see more and more submittals where only the most remote system (furthest from the water...

Thanks Sdpaddler50, I also paid my dues with 10+ yrs with FM (pre merger). The protection tables are much more user friendly now, but not so much with 2-0 and the installation guidelines. Yes, the overall water demands using some of the new FM designs are significantly lower than those of NFPA...

Thanks Sdpaddler50, It is not an FM insured but I occasionally use FM standards as an alternative to NFPA 13 per the equivalency clause (section 1.5). Funny how now a days some of the FM standards are more friendly than NFPA - used to always be the opposite. I did contact the local FM office...

Thanks cdafd, To your question of what size, I'm looking at it for a system that's about 25k sq.ft. But that was really my question... are there limitations (other than those for wet pipe systems)? Using FM 8-9 (a national recognized standard) as an alternative to 13, it appears to allow (per...

Hi, FM Global 2-0 Section 2.4.7.1 says that a 30% solution propylene glycol antifreeze system is acceptable if the ambient temperature of the protected area is maintained at or above 25°F (-4°C), as well as at or below 200°F (95°C) at all times. Are there limitations to this (aside from the...

Thanks all for your input. Bill, I agree that the mechanical ventilation fans mounted in the roof (used for warehouse cooling), especially the intake/supply fans should be shut down prior to the sprinkler operation. FM 2-0 is the only standard that I'm aware of that provides guidance on this...

Thanks Bill! Yes, I have read 2-0 many times and it is still confusing to me in some areas. It talks about ridge vents and exhuast vents in the same section (2.2.1.7.2). It wasn't clear to me if that included powered exhaust vents as 2.2.1.8 also mentions "ceiling level air discharge vents"...

Thanks cdafd. That's my thought as well but I can't find any reference to doing this for exhaust fans (only HVLS) in FM or NFPA. Am I missing it?

Looking for guidance on how to deal with powered exhaust fans located in warehouse roofs, commonly protected by supression mode heads. Can't find anything in NFPA (other than testing is based on them not being present). FM Global used to allow sprinkler heads to be installed in the center of...

Anyone have experience with Li-Ion battery storage and how best to protect it? I am particluarly interested in larger batteries (similar to car/truck batteries), but any info would be helpful. Li-Ion batteries, as I understand it, are more stable than lithium batteries as they only contain Li...

Thank you all for your excellent responses. I was thinking that I had seen somewhere (NFPA, IFC, etc.) a comment that gave a threshold for an amount of work on a sprinkler system that required plan submittals with calcs. I'll check with AHJ. Thanks again for your time.

Does NFPA 13 indicate at what point the AHJ needs to be involved and/or a licensed contractor should be contacted when replacing sprinkler heads - like for like. Can an owner replace 4, 10, 50 heads..... without involving AHJ or contractor. I imagine states have their own requirements, but I...

Thanks LCREP. Good example with the mattresses. I saw the same presentation at the SFPE meeting in Atlanta.

Thanks cdafd. Your second link seems to confirm what I thought. The small scale testing probably isn't enough to change a commodity classification in a storage configuration.

I have a warehouse that stores empty polypropylene battery cases in racks. Per NFPA 13 - this is a Group A plastic. The MSDS for this specific plastic indicates that is a UL 94V-0 flame retardant plastic. How, if any, does this affect the commodity class. I've looked on the UL web site and...