I haven't seen any in over 50 years. Of course, I have only been paying attention for the last 27.
At 06:30 PM 3/18/2009, you wrote: >In my 26 years in the Industry I have never installed one in the >closed meter loop or designed one with a check valve. Why would NFPA >'Pumps for Fire Protection Sytems' by Kenneth E. Isman, P.E. & >Milosh T. Puchovsy, P.E. state that. > > > > > > > >George Medina Jr. >Sr. Fire Sprinkler Designer >95-1015 Ka'apeha Pl. >Mililani, HI 96819 >808-388-5974 CL# > > >-----Original Message----- >From: Don Lowry <[email protected]> >To: [email protected] >Sent: Wed, 18 Mar 2009 12:43 pm >Subject: RE: Check Valve On Discharge side of Flow Meter > > > >Perhaps your speaking of a check valve is required on the >discharge side of the FP. The meter loop just circulates >water back to the pump and shouldn't have anything to do >with city supply. Look at the example configuration in the >appendix for your locations of checks required. As far as >the text, I don't have NFPA-20 (2002) we still use 99. >Personally I have never used or seen a check valve on the >meter loop in 30+ years. > >Don Lowry, >Dickerson Fire Protection > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf >Of George Medina Jr >Sent: Wednesday, March 18, 2009 3:04 PM >To: [email protected] >Subject: Check Valve On Discharge side of Flow Meter > >NFPA No.:Z4Pump02 page 108 - States that a check valve is >required on the discharge side of flow meter. Our union >field guys state they never put one on?there. Is this >correct? >I believe a flow meter would be damaged from positive city >pressure back flowing through the meter after shutting down >the pump and before closing the isolation valve. Somebody >correct me for being wrong. > > >George Medina Jr. >Sr. Fire Sprinkler Designer >Dorvin D. Leis Inc. >Honolulu, HI 96819 > >_______________________________________________ >Sprinklerforum mailing list >http://lists.firesprinkler.org/mailman/listinfo/sprinklerfor >um >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) > >_______________________________________________ >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) Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ 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)
