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  • Users: UFT12
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  1. UFT12

    Distance below ceilings for concealed space protection

    Appreciate the help on the following. per NFPA 13 (not NFPA 13R), do the rules about maximum distances below ceilings for standard spray sprinklers, either for obstructed or non-obstructed construction, apply the same way when talking about protection inside concealed spaces (i.e. above false...
  2. UFT12

    Question concerning "FM Data Sheet 8-9 Storage of Class 1, 2, 3, 4 and Plastic Commodities"

    Look closely, NFPA 13, ed.22 aligns with FM for 40' height. There 's just no criteria for lesser building heights, say 35' etc. Well, NFPA can be a bit savage sometimes...
  3. UFT12

    Question concerning "FM Data Sheet 8-9 Storage of Class 1, 2, 3, 4 and Plastic Commodities"

    It seems about right. Are there any racks in the area?
  4. UFT12

    Foam bladder tank location

    NFPA 11 4.3.2.1 Storage Facilities. 4.3.2.1.1 Foam concentrates and equipment shall be stored in a location not exposed to the hazard they protect. 4.3.2.1.2 If housed, foam concentrates and equipment shall be in a noncombustible structure. I believe that makes pretty clear.
  5. UFT12

    fire water demand

    It should be in your fire code. See for example NFPA 1, chapter 18.
  6. UFT12

    Automatic Fill Valves for Sprinkler Tanks

    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...
  7. UFT12

    fire water runoff collection in IFC

    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...
  8. UFT12

    Friction loss for reducer in sprinkler calculation

    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...
  9. UFT12

    Schedule 40 vs 10 for pre-action system

    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...
  10. UFT12

    Fire Water Pipe Size & High Flow Building

    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...
  11. UFT12

    FM Global and Baffle Requirements Separating Standard Response from Storage (ESFR) Sprinklers

    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...
  12. UFT12

    Fire Pump Sizing

    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...
  13. UFT12

    Obstruction criteria FM DS 02-00

    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.
  14. UFT12

    NFPA 13 Sprinkler Design - Ceiling Height?

    No, it does not.
  15. UFT12

    Obstruction criteria FM DS 02-00

    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...
  16. UFT12

    NFPA 14 - Looped Standpipes and Flow Splitting

    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...
  17. UFT12

    NFPA XX VS AS 2419 - Hydrant design

    Check chapter 18 of NFPA 1 .
  18. UFT12

    NPFA 30 - Warehouse Fire protection schemes A,B,C,D,E - What sets the scheme

    Tables 16.5.2.5 through 16.5.2.17
  19. UFT12

    Sprinkler Obstruction and Radiant Heating Panels

    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...
  20. UFT12

    Sprinklers under ducts

    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...

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