NFPA Definition:
"3.3.23 System Working Pressure. The maximum anticipated
static (nonflowing) or flowing pressure applied to sprinkler
system components exclusive of surge pressures and exclusive
of pressure from the fire department connection."
The pump's gonna start with one head and it will be very close to a
churn pressure - say in excess of 175 psi. So what would apply?
Operating pressure with "X" amount of heads flowing or the one head that
started the fire pump?
On 3/10/2015 1:54 PM, [email protected] wrote:
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
