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To add to this, NFPA 1 is also in alignment with the above. 18.4.4.4 * Required Fire Flow and Automatic Sprinkler System Demand. For a building with an approved fire sprinkler system, the fire flow demand and the fire sprinkler system demand shall not be required to be added together. The...

Thanks Travis, appreciated. I knew there had to be a limit for that. Strange that FM so meticulous with their standards not giving this vital information.

No, it does not.

Hello. I would appreciate if someone could enlighten me about obstruction criteria for storage sprinklers per FM DS 02-00. Table 2.5.4.5.4.1 of Interim revision January 2024, tells that when the obstruction is less than 24", it needs to be checked where the obstruction is located to avoid extra...

The 2024 edition has section 9.4 to address this. Section 9.4.3 seems to imply that multiple interconnections for wet systems are allowed and the rest of the requirements are not against it. In the 2019 edition, there was a limitation that required check valves be installed at the bottom of the...

Check chapter 18 of NFPA 1 .

Tables 16.5.2.5 through 16.5.2.17

Have you contacted the designer or the manufacturer of the heating radiators for recommendations such as indicative heat dissipation patterns and prevailing temperatures? For example, right next to the panel the radiation is expected minimal while convection typically does not run horizontally...

1m in not 4 ft. You probably mean 1.2 m. Assuming we abide to NFPA 13, the sprinkler deflector above the duct will most likely be even less than 25 cm which means that you need to apply the three-times rule for obstructions lying in the first 18 in (46 cm) vertically from deflector. This is...

The 20 psi refer to the hydrant while the 225 surely not on the connection rather to the pump. So these do not seem comparable. Anyway, although your though appears reasonable to me, you are pushing your pump to its limit (+50% from rating point, 1500 gpm). That may not be the best idea...

Sorry, I had other type of containers in mind. It makes sense. These can be like rooms without protection.

I ve seen many installations with ball valves and no, they don't have to be listed since the function of the system is not depended on them in case of malfunction.

I'm not sure what exclusion are you talking about. Section 3.9.1 does not exist. Also I am not aware of any exclusion about household commodities imposed by NFPA 13. The standard does not exclude commodities based on the occupancy the items belong to rather combustibility, type of packaging and...

You can slide up the curve III in Fig. 21.2.2.1 but you can't reach 8.2 mm/min since the curves are trimmed. So I don't see how you can get away without utilizing K115 heads unless you have high temp. heads already which this would enable you to use Fig. 21.2.2.2 with K80 (sliding up to reach...

Have you checked 21.1.4? Also, for a flow of 150 lpm and a density of 14.5 mm/min, the area of coverage results to 150/14.5 = 10.34 m² which seems it does not satisfy 10.2.4.2.1(d).

Hasan, have you checked this? www.nfpa.org/NFPA-LiNK

Sure. Here it is https://catalog.nfpa.org/Fire-Protection-Handbook-21st-Edition-P22371.aspx?order_src=s420

The GAPS guidelines are written from an insurance point of view which are concentrated mostly on property protection. NFPA standards are supposed to be part of a statutory body which impose the minimum requirements mostly for life safety. Therefore, it is expected that sometimes considerable...

Then the beam rule applies. See the requirements of 10.2.7.

The situation described in 9.3.5 is not for draft curtains between sprinklers, rather parallel. If this is your case, see figure A.9.3.5 for the maximum distance.