When we're in a pinch, we will use a one-hydrant test. We'll put a Hose Monster on the end of a 10 ft. hose attached to the hydrant. Take our static pressure with the hose disconnected. Then attach the hose, flow it and get our pitot off the Hose Monster, and the residual from the other ear of the hydrant. Then we disconnect the hose and take another static reading just to be certain. This method produces somewhat conservative results, depending on how much flow you have. The more flow, the more losses are being deducted in the residual reading due to friction in the hydrant barrel.
Again, not ideal, but we often face non-ideal situations. I'd take these results over a computer model simulation of the flow. Mark A. Sornsin, PE| Fire Protection Engineer Ulteig Engineers, Inc.| Fargo, NDÂ [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Wednesday, April 06, 2011 9:18 AM To: [email protected] Subject: RE: Flow Test I just want to add to Mike's and Lamar's posts (for the Sprink seriously in need of getting a life)- look at FIGURE A.8.16.2.4 Unacceptable Pressure Gauge Location. I belive this is similar to a single hydrant flow test. Like Lamar said, it is slightly less than two hydrant flow. The reason is that more of the potential goes into kinetic energy, because the velociity where the gage is NORMAL is higher. -----Original Message----- From: Brian Harris [mailto:[email protected]] Sent: Wednesday, April 06, 2011 8:50 AM To: [email protected] Subject: Flow Test I swear I once read that a single hydrant flow test was acceptable, maybe in limited instances, but I can't seem to find anything on it. Any ideas? Brian Harris First Defense Fire Protection 11957 Ramah Church Road Huntersville, NC 28078 Phone: 704.948.3506 Fax: 704.948.3507 Nicet # 128476 ======= Email scanned by PC Tools - No viruses or spyware found. (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.17210) http://www.pctools.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) _______________________________________________ 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)
