Yes the demand represents approximately 40% of the pump rating so it is below the 50% test point. Yes we have an actual pump test.
Any safety factor based on actual available versus demand is SO not an issue based on this system. Craig L. Prahl, CET Fire Protection CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, July 08, 2013 12:04 PM To: [email protected] Subject: RE: Using points on the pump curve for calculations It shouldn't be a problem if the demand gpm is at or below the actual 50% test point. I assume you have an actual pump test? The only thing lacking would be a water supply safety factor if required by contract or AHJ. Ron F -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, July 08, 2013 8:44 AM To: [email protected] Subject: Using points on the pump curve for calculations Got a calculation I'm reviewing where the designer used the fire pump 50% test point for his calculations and plugged it in as the City water supply info. The water source for the fire pump is an aboveground suction tank. I've not done this and was always taught that when a fire pump was used you used the fire pump churn, rated and 150% values in the calculation for your water source. Any thoughts, did I miss a memo on a new or other way to calc when using a fire pump? Craig L. Prahl, CET _______________________________________________ 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
