There's been other threads defining systems, but in this case the SF defines you have two, so two PRVs are reqd. If this bothes you as stupid, console yourself that when the one clogs up, you have installed a redundant one ready to take over. Unless you're using the larger claval we'd use on a pump, these things aren't but what- under $20?
glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Forest Wilson Sent: Sunday, March 08, 2009 9:52 PM To: [email protected] Subject: Re: relief valve on gridded system Well. Its a remodel job and each riser has a hydraulic plaque. Based on the area protected 90,000 sq ft. I think the intent was to treat them as two seperate systems? What defines a system? What defines a manifold with duffrent areas served? Is a riser a seperate system? Sent from my Verizon Wireless BlackBerry -----Original Message----- From: Ed Vining <[email protected]> Date: Sun, 8 Mar 2009 18:42:15 To: <[email protected]> Subject: Re: relief valve on gridded system Are they really two systems? They sound like one system with two sectional valves. Ed Vining On Sun, Mar 8, 2009 at 6:15 PM, Forest Wilson <[email protected]>wrote: > I'm sorry the other system is about 45,000 sq ft .... 90,000 total for > both. > Why do I need the relief valve if there is no check valve between the two > systems? > ------Original Message------ > From: Rod DiBona > Sender: [email protected] > To: [email protected] > ReplyTo: [email protected] > Subject: RE: relief valve on gridded system > Sent: Mar 8, 2009 8:42 PM > > I think the relief valve is needed and I also think that you need > another system....90,000 ft on the second? > > Rod DiBona > Rapid Fire > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Forest > Wilson > Sent: Sunday, March 08, 2009 12:44 PM > To: [email protected] > Subject: relief valve on gridded system > > We have a building with two wet systems fed from same riser manifold. > There is a detector check valve on the manifold. > The two wet systems do not have their own check valves. One of the > systems is gridded protecting about 45,000 sq ft. The other system is > not gridded, protecting about 90,000 sq ft. > Am I correct in assuming that a relief valve is not needed because the > pressure will equalize between the two systems? > The risers indicate the same pressure. > > Forest Wilson > Cherokee Fire Pro. > Sent from my Verizon Wireless BlackBerry > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: > [email protected] > > To Unsubscribe, send an email > to:[email protected]<to%3asprinklerforum-requ...@fire sprinkler.org> > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected]<to%3asprinklerforum-requ...@fire sprinkler.org> > (Put the word unsubscribe in the subject field) > > > Sent from my Verizon Wireless BlackBerry > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected]<to%3asprinklerforum-requ...@fire sprinkler.org> > (Put the word unsubscribe in the subject field) > -- Ed Vining 4819 John Muir Rd Martinez CA 94553 925-228-8792 _______________________________________________ Sprinklerforum mailing list http://lists.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 http://lists.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)
