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
