We adjust the test header valves to obtain identical pressure (of course with-in gauge accuracy). It helps to use calibrated pressure gauges of the correct range to produce pressure readings near the mid-span.
John From: Sprinklerforum <[email protected]> On Behalf Of Hinson, Ryan Sent: Thursday, March 29, 2018 2:23 PM To: [email protected] Subject: RE: Playpipe Pitot Pressures - Fire Pump Annual Tests I’ve never seen them all identical. Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Senior Fire Protection Engineer O 952-656-3662 \ M 320-250-5404 \ F 952-229-2923 [email protected]<mailto:[email protected]> \ burnsmcd.com<http://www.burnsmcd.com/> 8201 Norman Center Drive, Suite 300 \ Bloomington, MN 55437 *Registered in: LA, MD, MN, PA, TX, & UT **NICET IV - Water-Based Systems Layout From: Sprinklerforum <[email protected]<mailto:[email protected]>> On Behalf Of Tom Wellen Sent: Thursday, March 29, 2018 1:15 PM To: [email protected]<mailto:[email protected]> Subject: Playpipe Pitot Pressures - Fire Pump Annual Tests In my insurance days, I seldom had the same pitot pressures from playpipes. The pressures would be the same on several but others would be 1 to 2 psi different. I'm seeing fire pump reports consistently showing all the same pitot pressures for all four to six playpipes. I'm questioning that based on my past experience. Is the same pressures on pitots that common? Tom Wellen
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