Way-back-when, here in Canada the Insurance Advisory Organization published a booklet about flow testing. It is the only place I’ve ever seen that discussed single hydrant flow testing and it advised that one hydrant testing could be used as a check on the other tests or as a test method when less than 750 gpm is required or anticipated, but warned that it is not accurate.
Because of this, I’ve always avoided single hydrant tests and only did them when the demand would be less than 750 and where there were no other options, due to there being only one hydrant available and no other outlets that I could use to record static and residual pressures. Please note, the industry standard is 2 hydrant testing, as per the methodology laid out in NFPA 291. Best regards, Larry Keeping From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: March-03-17 10:36 AM To: Sprinklerforum <[email protected]> Subject: Re: RE: Single hydrant flow tests. Matt, I always like to witness the flow test whenever I can. I want to make sure they are doing it right. We have one company that charges $600 for a test and I end up doing it because they have no clue. My point is that I get hydrant information from contractors a lot of times as part of the bid package. I wonder if anyone uses info from the water company verifies what they do. On Mar 3, 2017 at 8:28 AM, <Matt Grise<mailto:[email protected]>> wrote: Many of the water companies around here will set a time and allow you to come out and watch – is it close enough that you can supervise? Matt From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected]<mailto:[email protected]> Sent: Friday, March 03, 2017 7:08 AM To: Sprinklerforum Subject: Single hydrant flow tests. I recently found a local water company does their flow tests using only single hydrants (flow and pressure on the same hydrant). Fortunately I have not done very much work there. Who verifies the methodology with a water purveyor when they get test results? Obviously not many people in my area as they had to look up how to do a 2 hydrant test before we did the new one. _______________________________________________ Sprinklerforum mailin
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