I’ve done them many times and the pressures are the same. It’s done by throttling the individual valves. It takes time and patience but it can be done.
Regards,Sean Conlin On Thursday, March 29, 2018, 2:22 PM, Hinson, Ryan <[email protected]> wrote: #yiv7784289223 #yiv7784289223 -- _filtered #yiv7784289223 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv7784289223 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv7784289223 #yiv7784289223 p.yiv7784289223MsoNormal, #yiv7784289223 li.yiv7784289223MsoNormal, #yiv7784289223 div.yiv7784289223MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv7784289223 a:link, #yiv7784289223 span.yiv7784289223MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv7784289223 a:visited, #yiv7784289223 span.yiv7784289223MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv7784289223 p.yiv7784289223msonormal0, #yiv7784289223 li.yiv7784289223msonormal0, #yiv7784289223 div.yiv7784289223msonormal0 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7784289223 span.yiv7784289223EmailStyle18 {font-family:sans-serif;color:windowtext;}#yiv7784289223 .yiv7784289223MsoChpDefault {font-family:sans-serif;} _filtered #yiv7784289223 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv7784289223 div.yiv7784289223WordSection1 {}#yiv7784289223 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] \ 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]>On Behalf Of Tom Wellen Sent: Thursday, March 29, 2018 1:15 PM To: [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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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