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NFPA13 Single Interlock Pre Action Area of Operation

NFPA13 Single Interlock Pre Action Area of Operation

NFPA13 Single Interlock Pre Action Area of Operation

(OP)
Hello All,

Can someone please advise if the requirement to increase the area of operation by 30% is applicable to Single Interlock Pre Action Systems?

I can see from the Code that it is a clear requirement for Dry Pipe and Double Interlock.

My application is a non storage environment and the deterction devices are rate of rise heat detectors and flame detectors.

Thanks

Dave

RE: NFPA13 Single Interlock Pre Action Area of Operation

No increase required for a single interlocked system.

RE: NFPA13 Single Interlock Pre Action Area of Operation

Single Interlock Preaction systems admit water into system piping upon operation of detection devices (NFPA 13-2013 7.3.2.1(1)). The heat and flame detectors will be more sensitive than the sprinklers, and will admit water into the piping before the sprinklers activate (7.9.2.8.1.1). The 30% design area increase for dry and DIPA systems is to account for the delay between sprinkler activation and water application onto the fire.

R M Arsenault Engineering Inc.
www.rmae.ca

RE: NFPA13 Single Interlock Pre Action Area of Operation

(OP)
Gentlemen,

Thank you very much for the clarifications.

Dave

RE: NFPA13 Single Interlock Pre Action Area of Operation

Yes. But, I do not believe you can use the QR reduction in a SIPA. I could be wrong, but that is my recollection.

Travis Mack
MFP Design, LLC
www.mfpdesign.com

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