NFPA #13 (2002) / 7.3.2.3.2 requires supervisory air pressure on ALL preaction systems (Min. 7 psi).
---- "Fletcher wrote: > So is a single interlock electric release pre-action system without > supervision air allowed by NFPA #13? > > Ron Fletcher > Aero Automatic > Phoenix, AZ > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Wednesday, June 09, 2010 11:04 AM > To: [email protected] > Subject: RE: non-supervised preaction > > In DIPA the piping is still supervised even if you have electric release > which would be by HD or SD's as opposed to pneumatic release with pilot > sprinklers. > > Craig L. Prahl, CET > Fire Protection Specialist > Mechanical Department > CH2MHILL > Lockwood Greene > 1500 International Drive > Spartanburg, SC 29304-0491 > Direct - 864.599.4102 > Fax - 864.599.8439 > [email protected] > http://www.ch2m.com > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Matt Grise > Sent: Wednesday, June 09, 2010 2:01 PM > To: '[email protected]' > Subject: RE: non-supervised preaction > > Would this in effect be a double interlock pre action system if the > pre-action valve was controlled electronically? The system would need both > the detectors to activate and release the pre-action valve, and one of the > sprinkler elements to fuse before water was released? > > Am I picturing the set up correctly? > > It seems like the main issue would be that you could not get a trouble signal > at the panel when one of the heads opened (or if the piping was damaged) if > there was no pressure change to activate a switch. > > They could always use nitrogen if they are opposed to air compressors. > > Matt Grisé PE*, LEED AP > Sales Engineer > Alliance Fire Protection > *Licensed in KS & MO > > 913.888.0647 ph > 913.888.0618 f > 913.927.0222 cell > www. AFPsprink.com > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Wednesday, June 09, 2010 12:55 PM > To: [email protected] > Subject: Re: non-supervised preaction > > Craig, > Does this client have a problem with air compressors? I guess if you don't > want to maintain supervisory air on the system then you could eliminate the > air compressor. But that would be a noncompliant way of doing the system.This > would then be a non-interlocked system no better than a simple dry pipe > system.But then again,a dry pipe system requires an air supply.So see my > original question. > > Lamar Vaughn,SET > > > ---- [email protected] wrote: > > Can someone provide commentary on the wording relating to "...air that > > might not be under pressure..."? > > > > The client wishes to eliminate air compressors based on this wording. > > > > > > NFPA 13, 2010 > > 3.4.9* Preaction Sprinkler System. A sprinkler system employing automatic > > sprinklers > > that are attached to a piping system that contains air that might or might > > not be under > > pressure, with a supplemental detection system installed in the same areas > > as the sprinklers > > > > Craig L. Prahl, CET > > Fire Protection Specialist > > Mechanical Department > > CH2MHILL > > Lockwood Greene > > 1500 International Drive > > Spartanburg, SC 29304-0491 > > Direct - 864.599.4102 > > Fax - 864.599.8439 > > [email protected] > > http://www.ch2m.com > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > > For Technical Assistance, send an email to: [email protected] > > > > To Unsubscribe, send an email to:[email protected] > > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
