One break occurred in the drum drip of an unheated warehouse (self explanatory as you mentioned). The other break appeared to occur at an elbow where the horizontal pipe turned vertical in an combustible concealed attic space. I didn't look at it personally so I'm not sure if the pipe was completely horizontal or if there was enough slope to it to collect water at the elbow. My guess is there was enough slope to it.
Next question... How much condensation can form on the insides of DP systems? Let say for conversation, a gallon of H2O collects in a location that isn't drained out. I know water expands when it freezes, but wouldn't the expansion take place back in the "dry" portions of the system? I mean unless there was enough water there to hold things from expanding into the system and cause them to expand outward, the water "should" expand into the dry portions of the system.... Shouldn't it? Path of least resistance. Steve -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, December 17, 2008 9:01 AM To: [email protected] Subject: Re: Dry Pipe System Dilemmas Where did the breaks in the system occur? That may help in diagnosing the problem. In a previous life we had a dry system that froze and broke at the drum drip due to lack of maintenance (also the drum was in an unheated space). We had another where there was over 100 low point drains in an attic system and one may have been missed during maintenance / after testing (I think we ended up tagging 156 low point drains after that happened). There is always some water in the systems, if they are not maintained properly things can happen. Andrew Weisfield _______________________________________________ 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)
