An old fitter, perhaps wise, told me one should always throw a simple swing check before a RP. This way once the high pressure stabilizes past the first swing check the RP doesn't burp anymore. I don't know if that make sense? We don't do RP's in these parts. Simple swing check is all that's required in MN. It's in a rule or statute that out rules AWWA.
Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tom Duross Sent: Wednesday, March 04, 2009 1:25 PM To: [email protected] Subject: RE: statistics - air pockets Chris- Just reading your post and catching up some here I think I just figured out a problem we had 2 summers ago. I used to test a storage building next to Boston's Logan Airport. Large ELO system above a high ceiling, 3 wet zones, fire pump, RP BFP. The facilities guy called me almost every Monday morning at 6:30 when he'd get to work and find the floor wet from the RP dumping. We'd get there for the first few calls, all cleaned up, everything seemed fine. After that, he'd just call to let me know it did it again. No alarms, pump never started, RP was right off the street supply too. We initially attributed it to city dropping over night and just figured that was why. I wonder if this is going to become a problem with all the RP's we're supposed to be using from now on. Those automatic air vets we install in split case pumps can take serious pressure, maybe that's a solution. Tom Duross _______________________________________________ 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)
