There's a difference between OPERATING pressure and SYSTEM pressure. Operating pressure would be the fire pump running and sprinklers operating. Churn wouldn't play into this scenario.
System pressure would be the pressure under static conditions with no flow. So the shut off set pint of the jockey pump should be the upper limit. For Churn you usually shut off the line serving the sprinkler system so the system downstream shouldn't see the churn pressure, right? Craig L. Prahl Fire Protection Group Lead CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29303 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected] -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Vince Sabolik Sent: Tuesday, March 10, 2015 1:42 PM To: [email protected] Subject: Re: Pump you up? Unless somebody messes with the limit switch, the jockey pump will be "off " on its own, no? On 3/10/2015 1:29 PM, John Denhardt wrote: > Tim - Please provide a reference for that information. > FYI - NFPA 20 Annex states Jockey Pump "off" setting as minimum static plus > churn pressure of the fire pump. > > John > > -----Original Message----- > From: Sprinklerforum > [mailto:[email protected]] On Behalf Of > Tim Stone > Sent: Tuesday, March 10, 2015 12:36 PM > To: [email protected] > Subject: RE: Pump you up? > > Don't forget to add about 10 PSI for the Jockey Pump. > City Static + Pump Churn + Jockey Pump 10 PSI = > > > > Regards, > G. Tim Stone > > G. Tim Stone Consulting, LLC > NICET Level III Engineering Technician Fire Protection Sprinkler > Design and Consulting Services > > 117 Old Stage Rd. - Essex Jct., VT. 05452 > CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343 > [email protected] > > -----Original Message----- > From: Sprinklerforum > [mailto:[email protected]] > On Behalf Of John Denhardt > Sent: Tuesday, March 10, 2015 12:08 PM > To: <[email protected]> > Subject: Re: Pump you up? > > Maximum static plus churn would be my off the cuff answer. > > John > > Sprinklers Save > >> On Mar 10, 2015, at 11:55 AM, "Vince Sabolik" <[email protected]> wrote: >> >> Would a fire pump's churn pressure (city static + pump churn) >> constitute the operating pressure of a sprinkler system? >> >> The red book has me confused. >> >> Again. >> >> >> thanks, Vince >> >> >> West Tech Fire Protection, Inc. >> 11351 Pearl Road / Strongsville, Ohio 44136 >> Phone 440 238-4800 Fax 440 238-4876 Cell 440 724-7601 >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprink >> l >> er.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > > -- West Tech Fire Protection, Inc. 11351 Pearl Road / Strongsville, Ohio 44136 Phone 440 238-4800 Fax 440 238-4876 Cell 440 724-7601 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
