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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

    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...
  3. UFT12

    Skylights in the design area

    I have a situation of sprinkler is a small skylight. I need to install it so no question about that. However, as this lies inside my application area, it seems I cannot find a reference in NFPA 13 on how to deal with it. Do I need to include it or not? My understanding is not, since it only...
  4. UFT12

    I shouldn't be asking this but I am

    I shouldn't be asking this but I am. As seen below, the flow is running as per the red arrows. The flow through F is only happening towards E, not the other way. On hydraulic node F (and B), what equivalent length would you incorporate in the calculations, of an elbow or of a tee? It seems i...
  5. UFT12

    thread184-206768

    thread184-206768 Interesting to read. SprinklerDesigner2 hopefully you never had issues there. One thing I would like to note though, mainly for my understanding, is that the 149 psi for a standard 2 1/2" hydrant butt (refered in post Nr 8) is understood as the pressure difference exerted on...
  6. UFT12

    NFPA 13, 18.5.7.1, Brace Design - Change of pipe direction

    Can someone please shed some light on the following. NFPA 13, edition 2019 18.5.7.1 Each run of pipe between changes in direction shall be provided with both lateral and longitudinal bracing, unless the requirements of 18.5.7.2 are met. The way I read this is that a change of direction is at...
  7. UFT12

    Application Area Definition - Centered btw Sprinklers or not?

    I would like to post this general question, mainly to the reviewers/regulators visiting this forum. When you get drawings showing an application area (AA) such as this... do you consider it fine? I personally don't as the area limits are not centered between sprinklers. The problem with...
  8. UFT12

    Explanation about thrust blocks Eq. A.6.6.1d NFPA 13, ed. 2019 (A.10.6.2.1d ed. 2016)

    I had this question for some good time now and always forgot to ask. Now it s the time. The equation per the thread title is for calculating thrust blocks for vertical movement. However looking closely, it seems that the product of Vg x Wm gives mass while the product of P x A gives force (of...
  9. UFT12

    In-rack arrangement - Single or double row racks?

    Hello, I am looking for the correct sprinkler arrangement in protecting single row racks over 7.6 m (25') height for class I through IV per NFPA 13. The two racks form an aisle of 2.7 m (8'-10"). The outside faces of the racks are free to open space from one side and 1 m (3'-3") away from a...
  10. UFT12

    Protection criteria for obstructions under ESFR system?

    The application is industrial located in the US. Typically we go by EH G1 and we are installing process protection and for obstructions (including platforms) much lower below the roof. We need to provide data for the building sprinkler contractor for some tie in points and flow requirements...
  11. UFT12

    Question about hydraulic calculation of flexible pipes

    This is general question. How do you guys claculate the pressure loss through a flexible pipe supplying a sprinkler? From the manufacturer's data I see one column with the actual pipe length and one with the equivalent based on 1" S40. So assuming I have my piping system made of S40, do I need...
  12. UFT12

    General gas flow equation concerns

    I 'm trying to apply the general flow equation for a simpe one straight line gas system and I would like to understand one thing. In order to calculate the flow I need to calculate the friction factor f first which requires calculation of the Re number which is depended on the flow I am...
  13. UFT12

    Extend of high or ultra high sprinkler heads above oven

    Hello all, I came across the following issue and I would appreciate any help or recommendations. I have a rectangular shaped industrial oven which has some maintenance doors on the side, around every 50 to 60 ft. There are cases where these doors may be open either accidentally or for any...
  14. UFT12

    NFPA 15 - Water supply duration

    I just wanted to know one thing. In a fully sprinklered building, type II(000) that requires additional column protection from a fixed spray system, what would be the water supply duration for the fixed system? I ve looked in NFPA 15 which doesn't seem to cover that. Section 7.1.10.3 throws me...
  15. UFT12

    Roll Paper Storage - CMDA criteria

    Regarding roll paper storage, looking at table 19.1.2.1.3(a) it looks like up to 10 ft of storage high, 0.3 gpm/ft2 over 2000 ft2 for heavyweight & mediumweight is required. However, par. 19.1.2.1.1 says that up to 10 ft height, ordinary hazard group 2 densities can be used (e.g. 0.2 gpm/ft2)...

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