Tom, leave it whre it is at for drain porposes. Youe mentioned that the pump has a bypass. Turn the pump off for the main drain test and test through the bypass. Glen buelow
On Thu, Dec 12, 2013 at 4:55 PM, Charles Thurston <[email protected]>wrote: > "Hello All, > > Would not the test point to test the forward flow of the backflow > preventer at system demand do the same thing as the main drain before the > pump? > > Thursday, December 12, 2013, 4:07:24 PM, you wrote: > > > You would want a main drain where it is installed so the system can > > be drained for maintenance, hence the word drain. Do you need > > another drain on the suction side of a pump for a test to verify > > condition? There is some merit to that idea. > > > Todd G Williams, PE > > Fire Protection Design/Consulting > > Stonington, CT > > www.fpdc.com > > 860-535-2080 (ofc) > > >> On Dec 12, 2013, at 3:49 PM, "Tom Duross" <[email protected]> wrote: > > >> I'm looking for opinions on this. > > >> A new building I just took over ITM on has a fire pump feeding > combination > >> standpipes, fully sprinklered high-rise circa 1974. > >> Existing 2" main drain is toast, handle broken, stem all chewed up from > >> wrenching. > >> I proposed we change it, use a 300# ball valve, galvy pipe; do it right. > >> BUT, it's on the system riser off the pump discharge and I say wrong > >> location. > >> Even the standard still says do a main drain test when you have a fire > pump > >> (imho silly), so I do. > >> A main drain test is to verify supply condition. I say with it where > it is, > >> we either have to drop the building to street pressure OR do a main > drain > >> with the pump running. In a case like this I always do the latter but > I see > >> others dropping the building and I think it's unnecessary and an > impairment. > >> The problem I have with doing 150-200# main drain tests is they do dump > a > >> ton of water, even with a fire hose off the 2" el and a hose monster. > >> I feel it's overkill and unnecessary on top of a waste of time but > whatever. > >> My issue (finally) is where to properly place a main drain when you > have a > >> pump. I say on the street side bypass supply, just flow supply > pressure and > >> be done with it. Facilities guy says others dumped building and just do > >> that. > >> Sprinklers are tested with the pump running, last few companies shut it > off > >> and went on jockey, that's why they're gone. > >> Looking for opinions and even second opinions (ok you're ugly too). > >> What's the proper location? > > >> TD > > >> _______________________________________________ > >> Sprinklerforum mailing list > >> [email protected] > >> > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > -- > Best regards, > Charles mailto:[email protected] > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- *Glen Buelow* *Glen W. Buelow, Inc.Fire Protection Design and ConsultingCleveland 330.220.7201 *●* Akron 330.665.4439* _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
