Thanks Steve I really appreciate your input but I still do not follow , the Potter Roemer restricting valves are only listed for 175 psi inlet. As I see it I still have the same issue of having a needed residual 230 p...@300gall to get 1...@300 (or 250 depending on city) out when using the regulating valve (non-reg valves not allowed in LA). In a standard 12' floor elevation change +5psi loss you cannot get from a regulating to restricting in one floor because of the 175 listing on the restricting valve. Note I need more than 175 psi up thru approx 4 floors.
Jerry M Costello set Advance Fire Protection Ph 714-526-2231 Fax 562-691-5482 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Wednesday, August 12, 2009 7:41 AM To: [email protected] Subject: RE: High Rise Standpipes Jerry: There is invariably a break where the static (churn) pressure drops below 175 in the standpipes, but above which you may still want pressure regulation. This is exactly how we do it in Lo-Cal and you want to look into a pressure RESTRICTING hose valve. They are much less expensive than reducing valves, and very simple to adjust in the field. Check out the Potter-Roemer catalog. Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jerry Costello Sent: Wednesday, August 12, 2009 7:33 AM To: [email protected] Subject: High Rise Standpipes We are beginning to see more and more authorities require the class 1 outlets to supply 125 at 500 at roof and in the city of LA 125 psi at 300 gpm at all class 1 outlets. I seem to be finding that once you reach a building height sufficient to require sprk/hose regulating valves then they need to be installed all the way thru the roof. This because the adjustment of the valves for the 125 psi setting does not allow you to switch back to standard non regulating valves once you get to needed elevation as you could in the past. Since the settings for the adjustable valves require approx 230 psi/residual in to get 125psi residual out, we are seeing what seems to me a pump sized much larger than should be required. I have thought of installing pressure regulating valves on the main vertical standpipes at a certain height, but not sure this is good practice. Any thoughts? Are mfg companies addressing this issue on a possible redesign? Thanks for your time Jerry M Costello set Advance Fire Protection Ph 714-526-2231 Fax 562-691-5482 __________ Information from ESET NOD32 Antivirus, version of virus signature database 4329 (20090812) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 4329 (20090812) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com _______________________________________________ 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)
