I haven't seen the flyer but I believe its in the neighborhood of 15 PSI. The concern is the same as in steel pipe systems- huge amount of potential energy with the possibility of rupturing piping in the case of CPVC. The inevitable air pockets in a CPVC system undergoing acceptance testing at 200 PSI certainly has the air in the pocket at 200 PSI; but with the vast majority of the piping filled with virtually incompressible water, the amount of stored energy isn't as great. Most of us have heard the incredible power of caps blowing thru block walls when there is a buildup of excessive pressure in steel pipe systems.
The residential dry system will be tripped on sustained decay of air pressure, based on the Potter QRS switch used in their electronic accelerator. It might just open a solenoid since there is no need for a differential-type DPV. Naturally residential systems will need to be calculated for water delivery time, 15 seconds. glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Travis Mack, SET Sent: Tuesday, September 14, 2010 11:01 AM To: [email protected] Subject: Residential Dry Systems Has anyone seen the flyer for the new Tyco Residential Dry Pipe systems? It states that it is listed for use with Tyco CPVC pipe and fittings. I was surprised to see the use of CPVC with a dry system. I had always thought that compressed air and CPVC was a very bad thing. -- Please feel free to call if you have any questions or comments. Sincerely, Travis Mack, SET MFP Design, LLC 2508 E Lodgepole Drive Gilbert, AZ 85298 Office (480) 505-9271 Fax (866) 430-6107 _______________________________________________ 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)
