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How do I go about designing protection below a dome?
We have a church project, and the dome is 30'-0" in diameter and is about 15'-0" high. It's basically a hemisphere. Looking for tips/guidance/creativity on getting this one started. Thanks. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
14 Comments
Mike L
1/6/2022 07:39:33 am
The layout of the sprinklers should follow the requirements for steeped pitched roofs.
Jesse
1/6/2022 08:06:52 am
You can protect using the requirements for steep / pitched roofs in NFPA 13 chapter 8. If its within your hydraulically remote area, remember you may need to increase the size of the design are due to the slope.
Glenn Berger
1/6/2022 08:09:13 am
Dependent on the slope, just follow standard NFPA 13 rules. I had to sprinkler a Jefferson-style dome years ago and enjoyed watching the Contractor figure out the exact lengths of pipes required before each "swing joint" to follow the curve of the ceiling.
Alex
1/6/2022 08:30:18 am
Agreed with the responses above! Make sure you increase your remote area based on the pitch. Ensure you work closely with the contractors when it comes to installation that heads are not too far off the dome.
Emil Ohler
1/6/2022 08:34:02 am
If hydraulics allow, use flexible sprinkler drops. Your installers will appreciate it.
Dan Wilder
1/6/2022 08:49:54 am
Having done a retrofit on the NAU Walkup Sky Dome...
Jessica Lutz
1/6/2022 09:33:20 am
This is my jam!
David
1/6/2022 10:15:18 am
I agree with all the comments but no one touched on attachment fasteners. I recommend the Sammy Swivel attachments for dome applications.
Dave
1/6/2022 10:50:09 am
I concur with Jessica’s excellent points and approach - Where you can run, hang, and brace/restrain the pipe is where I would start. Is there a conditioned space above the dome? If so, concealed sprinklers (perhaps one of the smaller-diameter ones that are available), custom-painted, if necessary, would look decent. Put on your architect cap for an acceptable, code-compliant sprinkler layout. If the piping must be exposed below, then it gets tricky, but sprinkler pipe is beautiful. Bending of pipe, as allowed in NFPA 13 can lead to impressive installations. (Check out photos of the main hall at LeMay / America’s Car Museum.) I am aware of dome structure similar to yours where the AHJ allowed protection by a ring of sidewalls down low, on an electrically-activated deluge system.
CONNOR
1/6/2022 11:52:04 am
For aesthetic purposes, I would like to add a caution on using back-to-back elbows to make the bends. Especially with grooved fittings and mechanical couplings, it can quickly become busy and distracting compared to other installation methods.
Anthony
1/6/2022 12:52:00 pm
8.6.3.2.5 Under curved surfaces, the horizontal distance shall
sean
1/7/2022 02:17:20 pm
no matter what it will suck, but a consistent design look will over better if exposed 5/9/2023 07:20:01 am
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