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  1. SprinklerDesigner2

    Another FM Data Sheet Question-You would think I would know this by now

    Got an FM job where we are dealing with FM Data Shhe 8-9 Table 8. Ceiling-Level Protection Guidelines for Class 4 and Cartoned Unexpanded Plastic Commodities in Open-Frame Rack Storage Arrangements. The height of the building is 17'-6" at the highest point. I would like to use the K25.2EC...
  2. SprinklerDesigner2

    Am I reading this correctly? FM Data Sheet 8-9 Table 8

    I got a little job where the ceiling is 16'-6" and FM Global directed me to FM Data Sheet 8-9 Table 8 I know I am reading this correctly but the pressures seem awfully low to me. Using K25.2 EC https://www.vikinggroupinc.com/sites/default/files/2025-03/121610.pdf all I need is 6 heads...
  3. SprinklerDesigner2

    Spray foam insulation and hanger rods

    I am dealing with an attic constructed of wood rafters that appear to be totally constructed using 2x4's. Problem is the installation of 0'-11" of spray foam insulation which dictates I have to use upright sprinklers and I am planning to install the deflectors about 1'-10" down from the roof...
  4. SprinklerDesigner2

    Hydrant flow test with static and residual obtained DOWNSTREAM the flowing hydrant on a dead end line.

    In my 50 years experience I always used an upstream hydrant to obtain a static and residual flow flowing the downstream hydrant. What I am dealing with is a recently installed 6" dead end city water main that has a fire hydrant located about 100' from the fire sprinkler flange and spigot piece...
  5. SprinklerDesigner2

    NFPA 13R Density required outside the living units in a common area when using listed residential sprinklers.

    I have a three story apartment building where the architect of record specifically called for a system designed per NFPA 13R and not NFPA #13. We have a common corridor where I used Tyco TY2325 listed residential dry sidewall sprinklers as the corridor is open at each end...
  6. SprinklerDesigner2

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

    Really pretty simple and straight forward but I just want to make sure I am interpreting this correctly. The building peek is between 30'-0" but does not exceed 35'-0". Lots and lots of water.... it appears I have two choices: Choice #1: 12 K22.5 quick response sprinklers discharging at 63...
  7. SprinklerDesigner2

    I know I have the the right answer but I just want to make sure.

    I have an electric pump in a 20'x20' metal (metal siding with bent metal purlins) building. The closest building, which is a fully sprinkled warehouse, is 130' distant. NFPA #20 2016 Table 4.13.1.1.2 tells me the fire pump house does not require sprinklers.
  8. SprinklerDesigner2

    I have an older warehouse being converted to an public assembly arena. Does anything need to be done with the sprinkler system?

    An older warehouse about 30 years old equipped with wet K=8.0 SR uprights on a system designed for baled cotton storage having a density of 0.25 gpm over 3000 sq ft with 500 hose. I believe it is just fine just as it is and even though it is a light hazard occupancy not having QR sprinklers...
  9. SprinklerDesigner2

    Automatic Fill Valves for Sprinkler Tanks

    I have a cold storage warehouse with a double interlocked preaction system where I plan to use a water storage tank and fire pump. Pump will be rated at 1,500 or2,000 gpm. Flow test results of the city watermain show 68 psi static, 42 psi residual @ 993 gpm. 20 psi @1,400 gpm. 500gpm hose...
  10. SprinklerDesigner2

    Question about whether a system is NFPA 13 or NFPA 13R

    First off it is NEVER my call to decide whether a system is to be designed per NFPA #13 OR 13R. That call is 100% the call of the project registered architect of record and nobody else. So I am looking at a two story project where there three offices with a residential area designed per NFPA...
  11. SprinklerDesigner2

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

    I have an older 200,000 sq ft warehouse which used standard response K=8.0 uprights and today they want to store plastic products. FM Global wants Data Sheet 8-9 Table 10 and with the building height 35'-0" it appears we have a choice between 12 K22.4 @ 75 psi or 12 K25.2 @ 60 psi. Yes, we are...
  12. SprinklerDesigner2

    Question about sprinklers added to a roaster...

    I can't find anything in FM Global data sheets that addresses the addition of sprinklers to the ductwork but even if I did I would want something from FM Global but... I have done the insides of a roasters and kilns but never the ductwork. I am just curious if anyone has run into this? High...
  13. SprinklerDesigner2

    Just thought some would get a kick out of this one... the worst installation I have ever seen!

    It's a 12,000 sq ft welding shop and the owner thought he could save some money by installing it himself. No drawings, no calculations just 100% CPVC pipe and pendent sprinklers used for upright and sidewalls. No tamper, flow switches, inspectors test, aux. drains and no need for a main drain...
  14. SprinklerDesigner2

    Question about COIN sprinklers

    I have a concealed space made up of 2"x8" solid wood joists @ 16" oc. We have approximately 2'-0" between the bottom of the solid wood joist and 2x4 accoustical ceiling. I am planning to use sch. 10 steel pipe with Viking VK950 COIN sprinklers spaced a maximum of 14'-0" Deflectors would be 1...
  15. SprinklerDesigner2

    Question about FM Global Data Sheet 8-9 Table 8 "Ceiling-Level Protection Guidelines for Class

    Question about FM Global Data Sheet 8-9 Table 8 "Ceiling-Level Protection Guidelines for Class 4 and Cartoned Unexpanded Plastic Commodities in Open-Frame Rack Storage Arrangements" I have a 156,000 sq ft warehouse and when we started out the owner told me to design per NFPA #13 for rack storge...
  16. SprinklerDesigner2

    NFPA 13 2019 TABLE 23.6.1 ESFR Protection of Rack Storage of Group A Plastic Commodities

    I have a 200'x200' building with a single slope roof having a 1/2" in 12" pitch. Low side is 32'-8" to underside of deck. High side is 41'-0" to underside of deck. I need to use K22.4 pendant ESFR sprinklers @40 psi which covers us for Cartoned Nonexpanded plastics. Problem I have is we...
  17. SprinklerDesigner2

    10.2.7.2.1.3* Minimum Distance from Obstructions and the 3 Times Rule

    What we see here is just part of a 10,000 sq ft floor space and what we see in the photo below is the finished product. Even the offices you see on the top photo has the exposed wood joists. Construction was completed two years ago so what you see is what you get as an end product. If we...
  18. SprinklerDesigner2

    Having to do with Draft Curtains and ESFR Systems

    I have a job where I am using K25.2 pendent ESFR heads where the building is rigid metal frames and 8" bent metal purlins. The 2 1/2" branch lines will be as high as possible next to the bottom of the purlins so the deflector is a maximum of 18" from the roof deck or ceiling. 14.2.10.1.3...
  19. SprinklerDesigner2

    NFPA 13R and domestic water allowance. Am I doing this correctly?

    I'm pretty sure I am correct in my approach but I would like any input. If the 8" loop was part of the city watermain I would not have to add any domestic water allowance as the domestic water would be fed from the 8" city main and not from the main feeding the fire sprinkler riser. However...
  20. SprinklerDesigner2

    Misuse of sidewall sprinklers... am I missing something here?

    NFPA #13 2019 Edition: 10.3.2 Sidewall Spray Sprinklers. Sidewall sprinklers shall only be installed as follows: (1) Light hazard occupancies with smooth, horizontal or sloped, flat ceilings (2) Ordinary hazard occupancies with smooth, flat ceilings where specifically listed for such use (3)...

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