Yep and many times it's due to a leaky system where the compressor runs a lot. Put a 40 psi test on the system to see how tight it is. That will confirm whether this is new water or from the past trip.
I've also see a cycle where the DD wasn't drained in fall and they have a freeze up in a DD. Then a couple week later another. What's happening there is the first trip adds water and some of it freezes to the inside of the pipe. Then a few weeks later with weather changes it melts and collects in the DD only to freeze during the next cold snap and so the cycle starts again. 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 Mark Sornsin Sent: Friday, January 08, 2010 3:59 PM To: '[email protected]' Subject: Excessive Condensate I have a client with a parking garage. Large enough for two dry-pipe systems. Each are piped relatively flat (pitched per NFPA 13, but no more); each on a big loop of 4 in main with side feed branch lines out the side of the mains. This system was last flooded last summer (say August). Since that trip test and subsequent draining, the client has blown out all 6 low point drum drips twice a month, every month. But even still, over Christmas, and only two weeks after blowing out the drum drips, they froze 4 of the 6 drum drips to the point of breakage - 3 of the 6 were filled with ice throughout the 2 in. x 12 in. drum, and up the 5 or 6 ft. of 1 inch pipe. The contractor that replaced the drum drips noted that there was no appreciable water on top of the dry valves, so the water in the pipes appears to be entirely from condensate. Or maybe, somehow, residual from the trip testing 5 months ago (???). Has anyone of you seen this amount of condensate coming from a dry system? The air compressors are floor mounted with no tank. The riser room is somewhat damp (large sump pit located here, too) and maintained at about 55 degrees. But I still have a hard time imagining how that much water could come from condensate. Any thoughts? Mark A. Sornsin, PE Fire Protection Engineer Ulteig Engineers, Inc. Fargo, ND Direct: 701. 280.8591 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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)
