Multi-hydrant tests can be of great value when you have a conditions that warrants a high flow rate. All to often the water purveyor or FD will go out and flow one hydrant and then extrapolate a flow rate down to 20 psi which is often used for the fire flow value.
One case where the multi-hydrant flow test became critical was for a project with a large fire flow requirement. A typical single outlet, single hydrant test was performed and they had about 700 actual gpm flowing and at 20 psi we should be able to meet the fire flow demand. But the system test pressures weren’t really that spectacular and I had my doubts so we requested a multi-outlet, multi-hydrant test. Once we got the final results, the system did not have the required flow. So if you’re doing a job where it’s light hazard, the initial one-outlet, one hydrant test might be fine, but if you have a high flow condition, insist on a multi-point test to get more accurate results. Craig Prahl | Jacobs | Group Lead/SME – Fire Protection | 864.676.5252 | craig.pr...@jacobs.com<mailto:craig.pr...@jacobs.com> | www.jacobs.com<http://www.jacobs.com/> 1041 East Butler Road Greenville, South Carolina 29606 From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf Of Bruce Verhei via Sprinklerforum Sent: Wednesday, August 28, 2019 3:44 PM To: sprinklerforum@lists.firesprinkler.org Cc: Bruce Verhei <bver...@comcast.net> Subject: [EXTERNAL] Re: Water supply test data It’s not a bad thing to have for instructional purposes. It can emphasize that higher flows give better results. It is shocking how consistent the accepted model is. Best. Bruce Verhei On Aug 28, 2019, at 09:04, Sprinkler Academy - C Bilbo via Sprinklerforum <sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>> wrote: Looks something like this snip: <image.png> It should be recognized that the above is my opinion as a member of the NFPA, and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects and should therefore not be considered, nor relied upon, as the official position of the the NFPA, nor any of their technical committees. Sincerely, Cecil Bilbo Academy of Fire Sprinkler Technology Champaign, IL 217.607.0325 www.sprinkleracademy.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.sprinkleracademy.com&d=DwMFaQ&c=OgZOSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=_w721WvezJkWUVteY4FMhecHAoDqOn85ooHi6vIkMag&m=nf0BF5rB3Yk6dPGBXzo4e7mTPdkrDpWmwfAW3x8dTQ4&s=t0HkWt92FCjZ5ZYsQS5v6XdBaMQrC1utzK0K1HoP1_Q&e=> ce...@sprinkleracademy.com<mailto:ce...@sprinkleracademy.com> ?? OUR STUDENTS SAVE LIVES!! _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org<mailto:Sprinklerforum@lists.firesprinkler.org> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwMFaQ&c=OgZOSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=_w721WvezJkWUVteY4FMhecHAoDqOn85ooHi6vIkMag&m=nf0BF5rB3Yk6dPGBXzo4e7mTPdkrDpWmwfAW3x8dTQ4&s=3ziG0ghlQn3Qni_ieGS-Odn-TBST0fcW_l0UtXzw1qw&e=> ________________________________ 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.
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