I have worked with a dry pipe system like this. I don't think there is a need to remove the water from the underground. When a sprinkler operates, the loss of supervising air pressure will be felt at the riser. That big slug of water in the underground will reduce the time needed to get water to the sprinkler when the detection system tells the valve to trip.
BTW another engineer told the client that the slug of water would keep the DPV from opening. No way. Each time we opened the ITV, the system tripped and we got water. Ed Vining On Fri, Feb 20, 2009 at 7:13 AM, Lori Kitchen <[email protected]>wrote: > We are working on the underground for a project where a remote building is > to be protected by a pre-action system whose valve is in a different > building 50ft away. The underground connecting these two buildings is to > be > part of the pre-action system (piping filled with air). In other words, > the > pre-action valve is in building A. The piping runs underground (after the > valve) to building B. > > This is a new one for us. My questions are what type of pipe do you use > for > this purpose and how do we drain the water out of the underground? > > I appreciate any info! > > > > > > Lori Kitchen > > Whitewater Fire Sprinkler > > > > 316-295-4120 (office) > > 316-295-4162 (fax) > > > > _______________________________________________ > 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%[email protected]> > (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)
