Low suction pressures aggravate water pollution is the argument. That's why we have BFP devices. Do fire dept. Pumper operators worry about suction psi?
Art Tiroly ATCO Fire Protection/Tiroly 24400 Highland Rd CLE 44143 216-621-8899 216-570-7030 cell -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, February 16, 2016 2:53 PM To: [email protected] Subject: RE: Oversized fire pump So the essence of that regulation is to preserve the ability to flush the toilet at the expense of fighting a fire and saving a life. Mark at Aero 602 820-7894 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Art Tiroly Sent: Tuesday, February 16, 2016 12:19 PM To: [email protected] Subject: RE: Oversized fire pump In Ohio we are required to provide a low suction control panel that will shut the pump off and sound an alarm. Later we now must provide a pressure sustaining valve that throttles the fire pump discharge flow to maintain a predetermined low suction pressure 10 psi on the suction to protect the public water pressure Art Tiroly ATCO Fire Protection 24400 Highland Rd CLE 44143 216-621-8899 216-570-7030 cell -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Todd Williams Sent: Tuesday, February 16, 2016 11:26 AM To: [email protected] Subject: Re: Oversized fire pump Mark, The 18 psi suction pressure is at the suction flange of the pump. There is friction loss in the underground piping and BFP so the pressure at the street will be greater. Given we have a steep curve (90 static and goes to 0 at 1900 gpm) and the size of the pump (1500 at 85), I am concerned if we have a big draw in an uncontrolled situation, unlike a pump test, do we have the potential of a serious problem. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (ofc) 860-608-4559 (cell) Sent using CloudMagic [https://cloudmagic.com/k/d/mailapp?ct=ti&cv=6.0.64&pv=8.2] On Tue, Feb 16, 2016 at 11:13 AM, [email protected] <[email protected]> wrote: Todd, When you talk about drawing the suction pressure down to 20 psi, is your reference point at the pump suction gauge, or at the connection to the city water main? Mark at Aero 602 820-7894 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Todd Williams Sent: Tuesday, February 16, 2016 8:54 AM To: [email protected] Subject: Re: Oversized fire pump No the water supply was the same. Not sure where this came from but could be an IOR mistake. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (ofc) 860-608-4559 (cell) Sent using CloudMagic [https://cloudmagic.com/k/d/mailapp?ct=ti&cv=6.0.64&pv=8.2] On Tue, Feb 16, 2016 at 10:46 AM, [email protected] <[email protected]> wrote: It may have been sized correctly in 2009 but the municipal water supply has degraded since then. Suction control valve is the way to go to fix the problem. That will keep the supply from being drawn down below 20 psi. Craig L. Prahl Fire Protection Group Lead/SME 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 Todd Williams Sent: Tuesday, February 16, 2016 7:41 AM To: [email protected] Subject: Oversized fire pump I am working on a facility with a fire pump that was oversized for the available public water supply. The pump is 1500 gpm at 85 psi. At 1500 gpm, the suction pressure drops to 18 psi. This is characteristic of the water supply and is not due to a shut valve or other obstruction. The pump was installed in 2009. Are there any safeguards that I should recommend for this situation? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (ofc) 860-608-4559 (cell) Sent using CloudMagic [https://cloudmagic.com/k/d/mailapp?ct=ti&cv=6.0.64&pv=8.2] _______________________________________________ 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 _______________________________________________ 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _______________________________________________ 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 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
