I had a similar sprinkler system layout, but the underground was about twice as long long. The water delivery time was well within the requirements. The water in the underground reduces the amount of air in the system, My bet is that the water in the underground would reduce the water delivery time, rather than increase it.
When water does get to the inspectors test does the stream appear to be obstructed? I wonder what a pressure gage at the ITV would read when water is flowing. On Thu, Jun 16, 2016 at 6:37 AM, Charles Thurston <[email protected]> wrote: > Hello Sprinklerforum, > > I am sure this topic has been exhausted in the past, but I did not find > a definitive answer anywhere. Does anybody still make an exhauster for Dry > Sprinkler systems. We are having issues whit a system installed many years > ago. Water delivery is 4-5 minutes to the inspectors test. > > System starts out in building A as a 6" runs across the building feeding > sprinklers in it, Then drops 12 feet to go underground 25 feet to building > B and comes back up. This pipe underground is holding water. Open > Inspectors test and it is 2 minutes before you start to see the sir gauge > at the riser start to drop. We have written it up on inspections for years > as too long of a trip time and the AHJ never said anything to our customer > so they would get it fixed. NOW the AHJ will not let a remolded store open > because the trip time is too long. The AHJ also "insisted" they install a > waterflow switch for this space, NOW it had a Vane type switch on the dry > pipe. > > -- > Best regards, > Charles mailto:[email protected] > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- Ed Vining 4819 John Muir Rd Martinez CA 94553 925-228-8792 Cell 925-787-0465
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