Forest, When using those test cocks I presume you've been properly trained and certified for touching a backflow device, only use the #4 cock and maintain a proper air gap above your fill cup at all times }:-)
On Fri, Mar 19, 2010 at 6:23 AM, Forest Wilson <[email protected]> wrote: > Tom, > For priming dry pipe valves I usually use one of the backflow test cocks, > attach the hose and fill into the cup. > Forest Wilson > Cherokee Fire > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Tom Duross > Sent: Friday, March 19, 2010 8:43 AM > To: [email protected]; [email protected]; [email protected] > Subject: RE: dry system air leak > > I was on an earlier thread about finding leaks. We had 2 fairly large dry > systems installed in the mid 70's and spending a lot of time servicing them. > I was going to try the scented oil method but even after flooding and > hyro-ing them, we couldn't find everyone. Some of the mains & risers were > behind finish. After finding leaks in both valve's trim assemblies and > EOL's (good call Todd) and repairing them, all we could guess were buried > grooved couplings. I couldn't go and buy expensive detectors or listening > devices. We ended up replacing them with low diff. dry valves, 13 PSI of > air instead of 45. > > I will add, we found lots of trapped sections of main, doubled the quantity > of drum drips. Plus, don't use a sight glass on the lower leg, they leak. > I thought it might be a good idea, you could see water with a flashlight but > with 2 kinds, brass and ci cross type, the both leaked air. We did use > longer sections of 2" in the drums where we could, just for more capacity. > > Has anyone ever installed a fill line for a traditional dry valve like the > priming valves they have for the external reset dry and deluge valves? Just > a 1/2" or 1/4" below the gate off the boss and some flexible copper or hose > for filling? I looked at that priming valve on the low diff. dpv and > thought it might work instead of ladling a coffee cup at a time out of a 5 > gallon bucket. > > Tom > > _______________________________________________ > 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) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC _______________________________________________ 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)
