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Interesting code reference from LCREP since NFPA states an "approved AUTOMATIC drip in areas subject to freezing." Seems you could only use that get-up in non-freezing areas. In freezing areas automatic is req'd, which would mean a ball drip which is all we specify anyways.

I don't deal w/ NFPA 25, being a designer, but is there a distinction being made here between sprinklers that are concealed between, say, a dropped gyp. bd. ceiling with no access, and the sprinklers in the attic which are accessible? Or is the intent just to observe from the viewpoint as a...

It looks like you would have more than enough coverage there. Standard sprinklers need only be 6 ft. apart, not 8 ft.

There's no discrepancy. Your first chart is for standard spray HSW sprinklers. You're using extended coverage sprinklers so you're in the wrong section. Manufacturer's are not going to violate what NFPA 13 states (they're required to abide by it) but their listing do, in a sense, trump '13.

Late to this game but what Travis said. I manually entered a six point curve into Hydra-Calc based upon Talco's pump curves for several models, save them, and just load them when I need them. I've used several other calculation programs and they should all be able to do the same thing. Other...

By interlocking do you mean dedicated stairwells (side by side but staggered), one for up-going traffic and one for down? If so, in my opinion it would make the most sense to put it in the up-going stairwell since that's how the FD would access the upper levels. I'm not aware of anything in '14...

Limited-combustible has a specific definition and not sure a soffit consisting of 2x framing (assuming that's what it is) would qualify. If it's open to the overhead sprinklers you need not worry but if it's truly completely concealed I would put a sprinkler in it or fill w/ noncombustible...

Travis, yeah - that's what I ended up going with. Thanks!

Size is about 28 sq. ft., roughly 78 Cu ft. Each. Sprinklers are required because there are many of these in the compartment. Yes, 13D per the subject line. 2016 edition, doesn't really matter since 13D pocket requirements have been unchanged since at least 2007 to 2019.

I have a project with some irregular shaped skylights requiring sprinkler protection. The actual skylight allowing the sun in is actually a small 2'x2' square about 2 ft. deep but then there is additional pocket space to diffuse the light which tapers out at an angle ultimately meeting a flat...

CDAFD, yeah, tell me about it. I have that conversation at least once a year when you get these inspectors asking "what if" for a 13D system. I tell them if the house burns down to the ground but the occupants get out alive the sprinkler system is considered a success! Think about that! WHAT IF...

Travis, yeah I understand what you're saying but it seems to cross the line into civil engineering. The good thing is, if you're only adding the domestic to the building you're calculating it's usually going to be a non-issue. Adding a few hundred gallons at the point of connection to an 8" main...

I wish the standards would be consistent. I was always under the impression, in the OP's image, that the 8" loop was a private WATER main and that the FIRE MAIN would be the 4" to the building and that because it's dedicated to fire it would be exempt from domestic allowance. If the domestic tap...

Hello, Can anyone recommend a company or broker for professional liability insurance for a sprinkler design firm? Thanks!

Yeah, you might get by with the shadow area rule and just put a sprinkler over every other partition. Sounds like a solid approach, getting the AHJ to see it your way might be another issue. :)

Yeah, I've got a ton of lisp routines I've made over the years, everything from automated calculation nodes, pipe dimensioning, spacing templates based on slope which you enter. A little bit of coding and you could just as easily make a routine to do the pipe capacities where you select the pipe...

Seems like a lot of overreaction here. Per 13R you need a UL Listed antifreeze - Listed antifreeze has been on the market for a while now. So you're good to go. There's no reason to be afraid of it. As an added safety precaution you could stick with K-factors of 4.0 or above. I believe the...

...and have sprinklers within 12" of the peak(s)

I've been involved in these sorts of situations as well and I always deflect it back to the civil engineer or architect since my scope of work is the interior piping and if I can get my system to work with the hydrant flow test alone then my work is done. My understanding is that building's...

For me it depends on a lot of factors. Generally speaking if it's a tree system I'm designing with varying size of branchlines then I'll go threaded. If it's a larger system with all the branchlines being the same size all the way down then I go grooved. Sometimes ugly jobs that aren't all that...