NFPA13 Single Interlock Pre Action Area of Operation

[DTR1968]

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

 

[LCREP]

No increase required for a single interlocked system.

 

[skdesigner]

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.

http://www.rmae.ca

 

[DTR1968]

Gentlemen,

Thank you very much for the clarifications.

Dave

 

[TravisMack]

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

http://www.mfpdesign.com