And in the State of Oregon, back flow testing is a licensed profession, with another separate license for repairs.
-------------------------------------------------- From: "Autry, David" <[email protected]> Sent: Tuesday, May 11, 2010 6:03 AM To: <[email protected]> Subject: RE: DCVA test connection > ""And where in 25 does it > say I have to prove anything?"" > > > NFPA 25 (2002, Edition) 12.6.2.2 > All backflow devices installed in fire protection water supply shall be > tested annually at the designed flow rate of the fire protection system, > including required hose stream demands. > > Somehow you need to "prove" that you're flowing the required demand. I'm > pretty sure the only to do that is measure the flow. > > > David Autry > Plans Examiner > Nebraska State Fire Marshal's Office > 246 S. 14th Street > Lincoln, NE 68508 > 402-471-9659 > 402-471-3118 fax > www.sfm.ne.gov > > ** Note new email address: [email protected] > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Ron > Greenman > Sent: Monday, May 10, 2010 11:17 PM > To: [email protected] > Subject: Re: DCVA test connection > > First I haven't seen any definitive consensus as to what needs to be > flowed: A flow sufficient to fully raise both checks off their seats > or a flow sufficient to raise the checks enough to meet the calculated > flow or a flow sufficient to substantially raise the checks. And if > the first two how do I know I've done either? And where in 25 does it > say I have to prove anything? I contend that the reason for this rule > originates from the days when we first were required to install > backflows on sprinklers the available models were weighted swing > checks. At that time there either was a real or perceived fear that > these types of check valves might not operate properly after long > periods of inactivity. I would also suggest that main drain flows > should be sufficient to demonstrate an operational valve set. This > begs the question then that why would the committee require a separate > test and the answer might be that the requirement is added separately > to define the need to separately record each part of the test, i.e.: > the water supply as measured through the main drain displays > properties consistent with, or inconsistent with the last test, and > that the backflow appears to be operating properly or not. There is no > place in 25 where anything else is required to be calculated and > without measuring instruments and calculations it is impossible to > determine a given flow. > > On Mon, May 10, 2010 at 7:57 PM, [email protected] > <[email protected]> wrote: >> In many cases one hose is enough for the flow needed >> >> Forest Wilson >> Cherokee Fire >> >> Sent from my Verizon Wireless Phone >> >> ----- Reply message ----- >> From: "tom poisal" <[email protected]> >> Date: Mon, May 10, 2010 8:01 PM >> Subject: DCVA test connection >> To: <[email protected]> >> >> Just a question, what happens after you have reversed the check valve >> or removed the clapper; when the water hits the clapper (or dual >> clappers) in the F.D.C. as you'll still only get a flow from one 2 1/2 >> outlet on the former and the latter - stoppage ? so then just remove >> the clappers? >> >> -- >> Tom Poisal, CET >> _______________________________________________ >> 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: > AFT WA 4184/AFL-CIO, 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) > _______________________________________________ > 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)
