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I try again to attach file... strange: i leave the link here: https://files.engineering.com/getfile.aspx?folder=b12877d8-f451-461e-8e40-547e325fa9d5&file=draw.pdf p.s. OP... original poster ok! https://files.engineering.com/getfile.aspx?folder=b12877d8-f451-461e-8e40-547e325fa9d5&file=draw.pdf

First of all, thank you!!! Second: what does mean "OP"? :P Third: see attached handmade draw (sorry for low quality). My question is "provocative": if Option 1 is ok, why Option 2 is not? For me Option 2 is an improvement than opt. 1... no? Less "empty volume" and less delay in activation...

Yes I know, tee construction have stems narrower. That's my doubt... From the structural point of view is identical, but i've some doubt that is identical also for "fire\smoke"; I will think about it! Thanks Travis ;)

Hello again! A colleague say that the case described above complies with 10.2.6.1.2 - (5) because it is like "concrete tee construction" with large legs spaced less than 2,3m on center. If this is true, i can consider the ceiling like a unobstructed construction... and provide sprinkler only...

Ok, thanks Travis, and UFT: Now i read again and better §10.2.7. If I've other dubt I will return [tongue]

Maybe I didn't explain myself very well (English is not always simple!). I'm watching Figure 10.2.7.1.2(a) (no §10.2.7.1.2) so I provide sprinkler under beams, because beams is an obstruction to Sprinkler Discharge Pattern Developmen, for sprinkler installed between beams.

mmm, yes normally i don't need protection under beams (<4ft) but sprinkler between beams is obstructed by the same beams - see figure 10.2.7.1.2 and table 10.2.7.1.2 NFPA 13 - 2019. so (i think) i need sprinkler also under beams. My problem is: there is a delayed activaction of sprinkler under...

Beams are long about 40m (130'), with an height of 90cm (36") and a width of 105cm (41"). Between 2 beams there are 115cm (45"). All these measure is indicated in the pdf attached [wink] Every "pocket", between 2 beams, has a volume of 41m3 (1447ft3). thanks again! AR

Hi people, I've a problem with a "special case"; I need to install a sprinkler system on a ceiling with big "beams" (1,05m x 0,90m - about 41" x 36") - see attached file. NFPA 13 provide some indication for beams (small beam 14") o for ceiling pocket (max volume 1000 ft3 - 28m3) but it's not my...