The manufacturers can tell you the maximum flow that should be allowed through one of their appliances. Many - but not all - put that information on their loss curves, sometimes shown as an open circle or diamond on the curve itself. These are RATED flows, but not the absolute maximum that can be run through the appliance; the curves themselves usually extend well beyond that point, so the devices have been tested and certified at higher flows than the rated maximum. I'll leave it to somebody smarter than me to explain how all that works ...
Steve Leyton -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Friday, April 15, 2011 10:42 AM To: [email protected] Subject: BFP maximum flows When sizing a backflow preventer for a job, what flow should be considered the maximum for the device? Is the Rated Flow the maximum? Can it be taken out to a UL Tested flow (which some manufacturer's include in their graph)? I tried to look it up but didn't find anything. Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.com _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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)
