Is all the piping, fittings, etc., rated for 300 psi? If you're worried about the heads, don't forget the whole system is technically rated for 175.
Craig Prahl CH2MHILL/SPB 864-599-4102 ________________________________________ From: [email protected] [[email protected]] On Behalf Of David de Vries [[email protected]] Sent: Wednesday, November 10, 2010 11:42 PM To: AFSA SprinklerForum Subject: High Pressure Dry Pendents I have an open parking garage under a high rise. Fire pump sized for standpipe demand, so it has over 200 psi at the garage level. Most of the dry pipe system in the garage has uprights, but there are some finished ceiling areas that need dry pendents. I have not found any dry pendents listed for more than 175. Suggestions? Of course, for most of the time the system will only see the ~50 psi air, but when the valve trips, it will be about 215. Am I wrong to think the DP's should be listed for the static system pressure? Dave David A. de Vries, P.E., CSP Firetech Engineering Incorporated --- On Wed, 11/10/10, Coastal <[email protected]> wrote: From: Coastal <[email protected]> Subject: Re: Pipe Expansion To: "Fletcher, Ron" <[email protected]> Date: Wednesday, November 10, 2010, 6:41 PM Hello Ron, It is not a building, Wooden walkway to a floating dock. Wednesday, November 10, 2010, 5:16:36 PM, you wrote: > Since the building and the sprinkler system are subject to the same > ambient conditions wouldn't the expansion rates kind of offset each > other? > Ron Fletcher > Aero Automatic > Phoenix, AZ > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Thom > Sent: Wednesday, November 10, 2010 3:04 PM > To: [email protected]; [email protected] > Subject: RE: Pipe Expansion > Also remember that a simple change in direction can provide the same > protection as a full expansion loop. > Subject: Re: Pipe Expansion > The expansion is the expansion no matter what fittings are employed, > well on > unrestrained steel. A fitting does not in itself restrain the pipe. > Either > the pipe moves or the want to move is translated into some internal > force. > The effect of the expansion it dependent on the fittings and the > restraintment. > _______________________________________________ > 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) -- Best regards, Charles Thurston Coastal Fire Protection Coastal mailto:[email protected] _______________________________________________ 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)
