If you re planing to use your tank as a break tank (< 100 % capacity), then the way I see it, your fill valves do supply your sprinklers directly.
Also, I wouldn’t use the criterion of 48,000 ft², rather the 750-gallon limit (with accelerator) in this case, since we are talking about dry...
Water containment for the entire duration of sprinkler systems, which can easily be 90 or 120 min for such occupancies, can be a nightmare to implement in terms of cost. So, jurisdictions or standards suggest a trade-off based on various facts. For instance, how likely is the system to run for...
Hydraulics for fire sprinklers are not like other hydraulics. For example, the turn of sprinklers directly screwed to tees or elbows is already accounted in the sprinkler K factor and therefore ignored. That typically includes the reducer as well. An other reason for such allowance is the...
Both ASTM A795 and ASTM A53 are available in schedule 10 so there is not problem specifying it. However, there are restrictions. See 7.5.1.2.
There is nothing against using schedule 10 for dry pipe systems. However, given the requirements 7.5.1.2 there may be an other schedule more desirable...
The criteria for LH per NFPA 13 call for an application (or design) area of 1500 sf, not 225 sf. There are specific requirements about the definition, shape and location of the application area that defines the flowing sprinklers. See chapter 27 or 28, depending on version, of NFPA 13. You will...
See 2.5.1.2.5 of FMDS 2-0.
2.5.1.2.5 Ceiling level sprinklers with different RTI ratings can be installed in the same area if:
A. A minimum 2 ft (0.6 m) deep solid noncombustible draft curtain is installed to separate the area protected
by quick-response sprinklers from the area protected by...
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.
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...
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...
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...
