We have five, two-car-high stacking units in a basement area. We have a smoke exhaust system but also need an active protection system.
NFPA 13 categorizes such arrangements as Extra Hazard (Group 2).
Does anyone have experience of what would be an acceptable layout around these areas as the NFPA 13 guidance is not extensive?
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8/27/2021 07:33:52 am
8/27/2021 07:34:28 am
Everything I've read basically says this often ends up varying from AHJ to AHJ.
8/27/2021 08:51:56 am
The couple we have done, we were only directed to provided EH2 at the roof. I agree with Alex, definitely in need of more clarification on this in NFPA. Not sure, but might be worth checking if FM has any additional requirements. Our main challenge was making sure we arranged the piping and sprinklers to avoid any clearance issues with the 2nd tier cars. I'm not familiar with the systems but you can be sure that if they tell a valet that no SUVs, only cars, someone will stick a taller vehicle in there (if that's even possible).
Brian Gerdwagen FPE
8/27/2021 09:06:27 am
Look at FM Data Sheet 3-26 Section 18.104.22.168. It has provisions for shielded fires. Similar to RV and boat manufacturing where you have combustible material inside a vehicle but do not have the ability to install sprinklers below the shield.
8/27/2021 10:00:04 am
I'm a FPE and ME who worked for the SFFD for over 14 years, I retired June 2021, and also have been in the fire sprinkler business for over 20 years prior. Now I have my own engineering firm. I'm licensed in multiple states.
8/27/2021 10:05:32 am
We found the same issue when reviewing NFPA 13 for specific design criteria. In our case we utilized the information from San Francisco along with other commentary. Our approved solution was as follows:
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