If I have multiple compounding remote area adjustments, when does the minimum remote area size for high-temperature sprinklers get applied?
For example, if there is a dry system protecting storage starting at 2,500 sqft, which calculation is correct?: (a) 2,500 sqft x 0.75 (high-temperature reduction) = 1,875 ... rounded up to 2,000 sqft for minimum area, then 2,000 x 1.3 (dry system area increase) = 2,600 sqft. or (b) 2,500 sqft x 0.75 (high-temperature reduction) = 1,875 ... 1,875 x 1.3 (dry system area increase) = 2,437 sqft, which is greater than the 2,000 sqft high-temperature minimum. Thanks in advance! Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
3 Comments
Wayne Ammons
12/24/2019 09:45:56 am
Referencing NFPA 13, 2013 Edition
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Juan M
12/24/2019 10:50:39 am
This is a good question. After going over NFPA 13 section 11.2.3.2.7, A.11.2.3.2.7, & 11.2.3.2.7.1 (2016 edition), I think "b" is correct. If you do the math as follows, accounting for the dry system increase first, then take the high temperature reduction you get "b".
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Jonathan Joseph
12/24/2019 11:14:35 am
I believe the intent of the 25% high temperature reduction for Extra Hazard occupancies is to give additional 5% reduction to dry systems but keeping a wet system above 2000sqft as a standard for Extra Hazard.
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