I have a question that stems from NFPA 318 (Protection of Semiconductor Fabrication Facilities), Chapter 11, Section 11.1.4.2.
11.1.4.2* Automatic sprinklers for cleanrooms or clean zones shall be installed in accordance with NFPA 13, and shall be hydraulically designed for a density of 8.15 L/min·m2 (0.20 gpm/ft2) over a design area of 278.8 m2 (3000 ft2). For a clean room 11.1.4.2 mentions 0.20 gpm/sqft density over 3,000 sqft design area. We're considering quick-response standard-spray sprinkler coverage under section 11.1.4.4. The client is requiring a double-interlock pre-action system, so under NFPA 13 11.2.3.2.5 the remote area must be increased by 30% without revising the density. Can we omit the 30% increase in sprinkler operation under NFPA 13 11.2.3.2.3 since we are using quick response sprinklers? Submitted anonymously and posted for discussion. Discuss This | Submit Your Question | Subscribe
5 Comments
Dan Wilder
7/21/2020 09:48:58 am
Quick response reduction is limited to wet pipe systems only Section 11.2.3.2.3.1 (1) 16' Ed.
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Jesse
7/21/2020 10:15:05 am
Would be nice but sadly, no. QR reduction is wet system only.
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Matt Clegg
7/21/2020 11:08:42 am
We have a similar situation, would the consensus be that we could use the QR reduction if the system is a wet system? I am curious what the communities opinions are on this.
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Tan N.
7/22/2020 01:29:30 am
In fact you have to increase the remote area even more, because more sprinklers will activate before the system is filled. I think that is the reason why QR is wet system only.
Reply
Franck
7/24/2020 03:36:19 pm
(personal opinion)
Reply
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