Craig,
I’ve always used 250 gpm per hose valve as a ‘rule of thumb’ but if you think of it like you would a test header, NFPA 20 says you can flow 2000 gpm thru 6 valves, so you should be able to do the same for testing a backflow. Cliff Whitfield, SET President Fire Design, Inc. 940 Summerbrooke Dr Tallahassee, FL 32312 Ph: 828-284-4772 From: Prahl, Craig <[email protected]> Sent: Wednesday, July 12, 2023 4:37 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Forward Flow testing valve arrangements Providing an array of 2.5” hose valves as a test header for testing the backflow preventer. Sprinkler System demand is around 1800 gpm. So, here’s the debate, when determining how many valves you need do you consider each valve capable of 250 gpm or 500 gpm flow? Nothing in NFPA 13, the debate goes on…………. Craig Prahl | Jacobs | Fire Protection SME – Special Hazards | <mailto:[email protected]> [email protected] | <https://urldefense.com/v3/__http:/www.jacobs.com/__;!!KZTdOCjhgt4hgw!-_khxU8gU0_6jc895I7kRbnU8JghRDsWgqOblZ4jr7Qp2IVbR30VYw_hWvNFtphnl0uWpB9KIvbYi1pvZz4$> www.jacobs.com 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS _____ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. -- This email has been checked for viruses by Avast antivirus software. www.avast.com
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