Speaking of such test, How many systems are installed with a means to
test the backflow at the required forward flow rate? like a wall hydrant?
Thom McMahon wrote:
Don't forget the derided full forward flow test!
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steve Leyton
Sent: Friday, May 30, 2008 8:42 AM
To: [email protected]
Subject: RE: Re[2]: 200 psi test for components rated 175
So it's contractual, not philosophical. Presumably, the installing
contractor tests it ...
I don't think we're talking about testing the backflow appliances itself for
functionality - that's best left for the "certified backflow
technician." If you pump up an UG including the BFP, the relief valve
will only operate when there's a differential between the clappers. So an
RPZ or RPDA usually weeps a bit when you pump it up, but once the line is
equalized you can run a conventional hydro. And if you just want to test
against it, you can pump up through the FDC or main drain or the supply-side
tap on the riser check, if so equipped.
Steve Leyton
Protection Design & Consulting
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Coastal
Sent: Thursday, May 29, 2008 7:10 PM
To: Steve Leyton
Subject: Re[2]: 200 psi test for components rated 175
Hello Steve,
I start 1' AFF with my work. I sub out any underground installation work I
get (which I try to avoid) and it is up to them to test it. Only question I
have is how do you get an RPZ to hold the back pressure to hydro to it? Pump
the system up through the #1 test cock?
--
Best regards,
Charles Thurston
Coastal mailto:[EMAIL PROTECTED]
Thursday, May 29, 2008, 6:55:37 PM, you wrote:
I'll bite - why not? If the Fire Department pumps into the FDC,
isn't
it likely to back pressure the BFP to at least 150? And if so,
wouldn't
it be prudent to test the assembly?
Steve Leyton
Protection Design & Consulting
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Charles
Thurston
Sent: Thursday, May 29, 2008 3:30 PM
To: IPA
Subject: Re: 200 psi test for components rated 175
Hello IPA,
I for one have never put 200 on the backflow, I will not either.
Thursday, May 29, 2008, 6:03:25 PM, you wrote:
I've got this question posed to me:
Backflow preventor is rated at 175 (as are most of the fire sprinkler
components) yet we are required to do a 200 psi test. Is the keyword
here
"working pressure" of 175 psi or am I missing something?
thx,
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