This edition now adds 2-level car stackers to Extra Hazard Group 2. Is it the intent to provide EH2 at the ceiling level above the 2-level car stacker and no other sprinkler protection is required, i.e. intermediate level sprinklers?
Will look at the section
my guess is ceiling only
not sure how intermediates could be piped
""""Is it the intent to provide EH2 at the ceiling level above the 2-level car stacker and no other sprinkler protection is required, i.e. intermediate level sprinklers?"""""""
Not a designer or engineer, But I would say 2016 NFPA 13 - A.5.4.2 just buts the stacker in a hazard category.
The actual design would be left up to the conditions found in the construction of the entire project, and the rest of NFPA 13.
Look at the definition of EHG2 - it includes situations where Shielding is Extensive. As such, a ceiling only system with not only more water to deal with a larger fire but a larger remote area to deal with the likelihood of additional sprinkler activating (since the sprinklers can't directly attack the fire).
There is additional information on this scenario, tat being a report of full scale testing in the UK -
Sprinkler Protected Car Stacker Fire Test Dec 2009 by BREGlobal
Its been a while since reading it but I believe it was successful with an OHG2 AND in-racks beneath all four corners of the upper car. It is also limited to 2 levels of cars.
As a committee member, this is just my opinion and not to be considered a formal interpretation of NFPA or any of its technical committees.
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