Todd, I have never heard of testing this way, I have always used a minimum of two hydrants. On a looped system if you have the manpower or water usage isn't an issue use three hydrants taking the pressure readings from the middle hydrant. Do you have access to NFPA 291, this has some good diagrams for you to use.
Jim Johnston, P.E. Fire Protection Engineer Inland Fire Protection, Inc 1100 Ahtanum Road Yakima, WA 98903 Phone 509-248-4471 Fax 509-248-1180 [email protected] -----Original Message----- From: Todd Williams [mailto:[email protected]] Sent: Friday, January 23, 2009 7:30 AM To: [email protected] Subject: water test location I did a flow test a couple of days ago on an underground main that had recently been looped. There is a main that feeds a hydrant and sprinklers to the building at the end of the loop. I flowed the hydrant and read the pressures off the first test port on the backflow preventer (before any checks) on the system riser. The contractor called me this morning and said my test was not valid because I didn't use two hydrants, like it says in NFPA. I think I am OK and the effective point would be the connection of the main to the sprinkler system feed. Am I right or am I missing yet another obscure ruling? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ Sprinklerforum mailing list http://lists.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 http://lists.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)
