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I have a project where a greenhouse is being built onto the side of a hardware store to be used as a seasonal retail space occupied during the warm season only (so they say).
The greenhouse is required to be protected by a dry sprinkler system as a retail space. The greenhouse manufacturer has also indicated that it needs to be heated to prevent snow accumulation on the roof, so there are unit heaters ranging from 150 mbh to 200 mbh. Since the roof is entirely glass, I am providing intermediate temperature sprinklers throughout. With the unit heaters, I would be required to put intermediate temperature sprinklers within range of the unit heaters output. Since I am already going intermediate throughout due to solar gain, should I go high temperature at the unit heaters? I'm thinking about very cold winter day when the sun is shining, so there would be two sources of additional heat on the sprinklers. Thank you very much! Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
11 Comments
Pete H
3/14/2024 06:53:40 am
This sounds like a case of: "It's not a requirement... but it's a pretty dang good idea." to me. (Apologies if it actually is a requirement.)
Anthony
3/14/2024 08:14:18 am
I agree with Pete here on both fronts. Yes make the heads near the heaters 286, and double check your storage isn't over 12'.
TYLER
3/14/2024 08:11:04 am
286 deg. No worries.
Glenn Berger
3/14/2024 08:16:45 am
Need to know the discharge temperature of the unit heaters to advise on the temperature rating of adjacent sprinklers.
JI
3/14/2024 08:22:10 am
Unless you have a maximum ceiling temperature measurement from the company you are working for, I would agree with using high temperature sprinklers. I think it is a logical argument to say heaters + sprinklers under direct rays of the sun would lead to using high temperature sprinklers.
James Phifer
3/14/2024 08:23:01 am
Sprinklers under glass or skylights shall be of the intermediate temperature range. but if you are in the 7 ft diameter range of the unit heater then you should use high temperature.
Todd
3/14/2024 08:36:32 am
Not sure which version of NFPA 13, but from 2013:
DE
3/14/2024 01:34:41 pm
Just a note: 8.4.7.3.4. (NFPA 13, 2013) is for CMSA sprinklers specifically. I got a bit worried there since we've used intermediate sprinklers CMDA in garden centers. Phew
Casey Milhorn
3/14/2024 11:11:09 am
Fairly well covered. I would submit a RFI to ask what the expected maximum temp under the glass is. I can almost guarantee it will be within the range to use high temperature sprinklers. Not to mention if they have high piled storage out there, high temps might be favorable in your calculations because of the errant activations that can occur with ordinary/intermediate temp heads in these situations. They might also be limited in storage arrangement if the glass ceiling is sloped too much.
Jesse
3/14/2024 11:28:07 am
No problem per se using high-temp sprinklers throughout. I'm curious as to the distance the sprinklers are from the heaters.
Franck
3/14/2024 03:35:03 pm
As suggested by Jesse, why not using high temperature sprinklers everywhere and not just at heaters. Leave a Reply. |
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